Grain legume decline and potential recovery in European agriculture: a review

  • Peter Zander
  • T. S. Amjath-Babu
  • Sara Preissel
  • Moritz Reckling
  • Andrea Bues
  • Nicole Schläfke
  • Tom Kuhlman
  • Johann Bachinger
  • Sandra Uthes
  • Fred Stoddard
  • Donal Murphy-Bokern
  • Christine Watson
Review Article

DOI: 10.1007/s13593-016-0365-y

Cite this article as:
Zander, P., Amjath-Babu, T.S., Preissel, S. et al. Agron. Sustain. Dev. (2016) 36: 26. doi:10.1007/s13593-016-0365-y

Abstract

Sustainable development of agriculture is at the core of agricultural policy debates in Europe. There is a consensus that diversification of cropping would support sustainable development. However, a reduction in legume cultivation has been observed in the EU during the last decades. This decline has induced, in turn, a deficit of proteins and a reduction of ecosystem services provided by legumes. Therefore, we analysed the mechanisms that shape agricultural systems to identify leverage points for reviving European legume production. Specifically, we reviewed the factors that affect the market and non-market value of legumes and the relevant agricultural policies. We characterized the decline in legume cropping as an outcome of the dominance of economic forces that favour specialization of production systems over diversification. We found that the value of market outputs of legumes per unit area is relatively low and volatile, with a 25–78 % variation in pea gross margins, which reduces market competitiveness. We observed that the value of system-internal outputs of legumes such as the nitrogen fixed, of 130 to 153 kg N ha−1; crop protection services that reduce agrochemical costs, by 20–25 % in cereals; and yield enhancements of subsequent crops, of 0.2 to 1.6 t ha−1 in cereals, are often underestimated. In addition, markets fail to translate external effects of legumes such as biodiversity enhancement, reduction in emissions, of up to 50 % in N2O, and soil improvements into economic benefits. Current policies support legumes through selected mechanisms such as ecological focus areas, agri-environmental programmes and sparse coupled support measures. Domestic cultivation of legumes could be supported through trade policies such as import restrictions on genetically modified soybean or new mechanisms to appreciate non-market outputs including payments for ecosystem services and carbon markets. In addition, development of new value chains, niche markets, scaling-up of plant breeding efforts and dissemination of information is required.

Keywords

Land use change Protein crops Diversification Specialization Economic pressures Sustainable land use 

1 Introduction

The sustainable development of agriculture is at the core of agricultural policy debates in Europe, and there is a consensus that diversification of agriculture is needed to achieve this goal (Davis et al. 2012; Lin 2011). In contrast, one of the larger shifts in production patterns i.e. substantial reduction in legume cultivation in Europe caused a significant decline in crop diversity in the EU during the last decades. This decline resulted in foregone ecosystem service provision and a production deficit of plant proteins in Europe. So, it is imperative to discuss the reasons for the decline in grain legume cultivation and ways to reverse this trend. We take the view that imbalances between two basic and opposing transition pressures (Amjath-Babu and Kaechele 2015) are behind the decline in legume production in Europe. One pressure is the economic effect of specialization (crops here) that is grounded in David Ricardo’s ‘law’ of comparative advantage that drives much of international trade and economic development and growth (Gale 2000). Economy of scale is one of the key sources of comparative advantage and hence the specialization trend in farming. The other is the ecological benefits of crop diversification including nutrient provision, emission reduction, biodiversity enhancement, pest and disease management (Kremen and Miles 2012) and its translation to economic benefits. The current study attempts to identify the leverage points for restoring grain legume production through an in-depth analysis of the transition pressures.

There is a general trend towards simplification and specialization of agricultural production systems over time, in Europe and elsewhere (Brouwer 2006). This results in a gradual reduction in diversity with homogenisation of farm landscapes caused by a deliberate reduction in planned diversity with cropping sequences (crop rotations). Associated with this, there is usually degradation of biological functions, for example, ecological pest management replaced by pesticide use or biological nitrogen fixation (BNF) replaced by mineral fertilizers (Noordwijk and Swift 1999). Grain legumes are a group of crops that is an important component of diversified farming systems. They provide services such as pest control, nutrient supply and biodiversity-based insurance (Baumgärnter 2007). The ecosystem service effects of these diversified farming systems are often not well recognized and are therefore undervalued. This is due, at least in part, to their complexity in both ecological and management terms, particularly in relation to variability in soils, weather and the interaction of these factors with management (Pannell 1999). In relation to forestry, Gale (2000) concluded that it is necessary to find compromises between specialization and diversification forces to secure and develop sustainable production systems. This may need public support for the management of agroecosystems to reduce negative external effects. In other words, negative external effects that are caused by market failures should be addressed by regulations that internalize externalities using payment for ecosystem services or that penalize dis-services. This can be agri-environmental regulations, public payments or private payments.

From a socio-technical viewpoint, Voisin et al. (2014) reviewed the development and current situation of legume production in France and concluded that a ‘technological lock-in’ exists: While legume cultivation is highly efficient in the use of internally produced (fixed) nitrogen, the whole socio-technical system of farming relies on the use of external resources, especially feed and fertilizers, and is difficult to change. They propose developments of niches and wider policy support for a transition to more diverse agricultural systems. Complementing their assessment, the mechanisms and pressures that shape agricultural systems are analysed in-depth to identify leverage points for reviving European legume production. Ultimately, farmers decide which pathway they follow, towards further specialization of agroecosystems serving to existing markets or towards realizing the benefits from diversified production systems through entrepreneurship and innovative technologies.

Figure 1 shows the major factors within the decision framework of farmers that affect the net economic benefits from specialization and diversification options. We argue that there are a number of farm-level benefits of legumes that are often not realized or understood by farmers or that could be further developed. General market pressure reinforces large-scale cultivation of the best-performing crops and enforces cost reduction, including management costs. On the other hand, the translation of non-market output of diversified agriculture (here legumes) into tangible economic returns is seldom accomplished. Hence, the current setting leads to simplified production systems, and their negative environmental impacts are usually externalized. Under this framework, in addition to enhancing the value of marketed output of legumes, translation of non-market outputs to economic goods through agro-environmental payments, greening rules and in the future possibly greenhouse gas abatement payments from carbon markets could support inclusion of legumes in European farming systems. It is of course imperative that any possible negative impacts of legumes on the environment are also accounted for.
Fig. 1

Factors influencing farmer’s crop choices

The net economic value of marketed and non-marketed outputs and services realized at farm level is a major factor determining crop choice of European farmers. In case of legumes, any deficit in the economic return from marketed outputs relative to competing crops can lead to their exclusion and hence increase the pressure to specialize into latter crops, whereas any increase in the economic value of non-marketed outputs realized at farm level can increase the incentive to include them in cropping system and hence enhance the pressure to diversify. We use this basic framework to analyse the factors that are ultimately responsible for decisions related to the production of legumes at the farm level in order to improve our understanding of the reasons for the decline of legume cultivation in European farming systems and to evaluate options for improvement.

We portray the decision that a farmer makes to choose legumes as a reflection of the net economic return including marketed and non-marketed products and services from their cultivation in relation to the net economic return from the next best alternative crop. The major factors affecting the relative economic returns from marketed outputs of grain legumes are food and feed market conditions, volatility of returns and gross margins of competing crops (Section 3). The valuation of non-marketed products and services such as BNF, pest control and the yield enhancement of subsequent crops depend on various factors such as the level of pesticide and fertilizer prices, the degree of understanding and appreciation of these effects by farmers and the mechanisms to obtain payments for positive externalities (Section 4).

2 Development and current situation of grain legume cultivation in Europe

Until about 1970, common bean (Phaseolus vulgaris L.) was the most widely cultivated grain legume in Europe. Following the introduction of policy support for soybean and protein feed crops in the 1970s, field pea (Fig. 2) and soybean became the most widely grown grain legumes. Peak production areas of these crops exceeded 1.3 and 1 M ha, respectively, but both have declined since the 1990s. In 2013, pea, soybean and faba bean (Fig. 3) covered 200,000 to 500,000 ha each, whereas other grain legumes covered less than 100,000 ha each. Overall, grain legume cultivation declined from 5.8 to 1.8 M ha between 1961 and 2013 (Fig. 4). Despite the decline in area under legumes, the total grain legume production in Europe still increased during that period from 3.3 to 4.2 M t (FAOstat 2015), but the productivity gains were lower than those observed in major cereals. Rapeseed and sunflower production expanded in terms of the proportion of the arable area while cereals and forage maize retained their share of around 57 %.
Fig. 2

Variety trials of field pea (Pisum sativum L.) in northeastern Germany

Fig. 3

Faba bean (Vicia faba L.) grown for feed

Fig. 4

Change in the areas of production of key arable crops in the EU-27 (1961–2011). Data source is FAOstat, 2013 and note that pre-1992 data do not include data on crops grown in former Czechoslovakia, Estonia, Latvia, Lithuania and Slovenia

Grain legumes deliver a unique combination of high-protein grain for food and feed, BNF, improve cropping systems in terms of reduced pests, diseases and weeds, enhance soil quality and support positive environmental impacts such as reduction in greenhouse gas emissions and increased biodiversity (Kirkegaard et al. 2008; Nemecek et al. 2008; Peoples et al. 2009a; Peoples et al. 2009b). Due to the high protein content (23–40 %) in the seed dry matter, they play a key role in protein supply for human consumption and livestock nutrition. Using BNF negates or reduces the need for synthetic nitrogen (N) fertilizers thereby saving the fossil energy resources required for fertilizer manufacture and transport, and indirectly reducing greenhouse gas emissions (Nemecek et al. 2008; Westhoff 2009). Grain legumes increase the yield of subsequent crops in the rotation not only because of BNF but also due to non-nitrogen effects such as pest and disease suppression (Chalk 1998). In addition, the increased crop diversity that results from including legumes in cropping sequences supports the associated diversity of wild flora, fauna, and soil microbes (Peoples et al. 2009b; Köpke and Nemecek 2010).

Currently, 3 % of soy used in Europe is sourced domestically, and domestic and imported soybean together supply 64 % of high-protein crop plant product consumed in Europe (de Visser et al. 2014). Domestically produced soybean accounts for only 3.4 % of the high-protein feed material used (PROLEA 2013). The large-scale import of soybean as a substitute for domestic production of protein crops, especially legumes, is not sustainable for a variety of reasons. The concentration of animal production in certain regions of Europe results in a high per hectare organic manure input (Mulligan et al. 2006) and hinders efficient circulation of nutrients within the agricultural system. It is estimated that the 28 M t soybean meal derived from imports represent approximately 12.8 M ha of land outside Europe (de Visser et al. 2014). According to Smaling et al. (2008), about 33 % of N in soy is lost in animal waste, transport and non-edible and food waste, of which 50 % could be potentially recycled. An increase in legume cultivation in Europe will help to reduce the European plant protein deficit and could contribute to more environmentally and economically sustainable production patterns.

3 Factors affecting marketed outputs

3.1 Volatility of grain yields and revenues

There is a larger annual yield fluctuation in grain legumes than in most cereals (Cernay et al. 2015. For a risk-averse farmer, high-yield variability (Jensen et al. 2010; Hauggaard-Nielsen et al. 2008; Ayaz et al. 2004; Wright 2008; Sass 2009; Flores et al. 2012) and the resulting high variability of returns with legumes (Table 1) discourage cultivation. This is supported by a survey of farmers in Belgium, Germany, Spain and Switzerland where yield instability was mentioned as a major constraint to grain legume production (von Richthofen et al. 2006). Agronomic management options to improve yield stability are limited (e.g. Yau and Ryan 2013; Stemann and Luetke-Entrup 2001; Ayaz et al. 2004). However, recent analyses (Schäfer 2013; Döring 2015) argue that yield instability of grain legumes is often overestimated. Calculations based on German national yield data from statistics show that variation in yields of field pea and faba bean was lower than those of rapeseed and rye (Schäfer 2013), despite the fact that grain legumes are often grown on less favourable sites. Another research suggests that the scale of yield analysis may influence the variability, for example, Reckling et al. (2015a) showed for a long-term field experiment that yields of field pea and narrow-leafed lupin fluctuated significantly more than yields of other crops. LMC International (2009a) reported that field pea and faba bean gross margin volatilities were lower or comparable to rapeseed, wheat or barley in four out of five case study regions (Table 1). Given the fact that in some regions, production risks are comparable with competing crops and that legumes and cereals respond differently to weather conditions; grain legumes can also play a role in spreading risk (Mishra and Lence 2005; Peltonen-Sainio and Niemi 2012).
Table 1

Volatility of crop gross margins in 2001–2007

 

Volatility (coefficient of variation %)

Faba bean

Pea

Wheat

Barley

Rapeseed/sunflower

Germany, Niedersachsen

46

51

34

21

35

Spain, Castilla-La Mancha

78

42

48

74

France, Seine-Maritime

25

16

18

33

France, Eure-et-Loir

31

29

22

22

UK, East Anglia

36

31

23

21

49

Source: LMC International (2009a)

3.2 Market conditions

3.2.1 Human consumption of legumes

In Europe in the 1960s, grain legume crops used exclusively for human consumption such as common bean, chickpea (Cicer arietinum L.), cowpea (Vigna unguiculata L.), groundnut (Arachis hypogaea L.) and lentil (Lens culinaris Medik.) dominated the grain legume cropping. Currently, only 15 % of field pea and 19 % of faba bean consumed in the EU are eaten by humans (PROLEA 2013). However, there may be a substantially higher food market potential considering that the EU is a net importer of the aforementioned grains (2009–2011 data from FAOstat 2015). Within the EU-15,the quantity of pulse-derived protein ranges between 0.1 and 3.7 g protein per person and day (total protein intake ranging from 96 to 119 g/person) (de Boer et al. 2006). It is noticeable that the area of grain legumes in the Mediterranean countries (Cyprus, Greece, Italy, Malta, Portugal and Spain) has declined less than in other EU regions over the period 1961–2012. This is partly attributable to the prominent role of food legumes in the regional diet (de Boer et al. 2006).

3.2.2 Dietary change

The increase in consumption of animal proteins (Fig. 5) in the EU-15 in the recent past was not associated with reductions in plant protein intake by humans (de Boer et al. 2006). Reducing the current high level of meat consumption has been linked to a potential improvement in health in Europe, as well as reduced demand for soybean for feed with the related environmental impacts and a reduction in the GHG emissions of livestock production. It is estimated that a 50 % reduction in meat and dairy production and consumption could reduce GHG emissions from agriculture by 25 to 40 %, and nitrogen emissions by 40 % (Westhoek et al. 2014). Partial meat substitution with soybean proteins in minced and processed meat products has been suggested as a way of reducing livestock production and associated environmental impacts (Smil 2002; Davis et al. 2010). Meat replacement with pulses could contribute to the recommended 62 % reduction in meat consumption in Europe to meet climate goals (Hallström and Börjesson 2012). However, in Europe, a reduction in animal protein consumption would not necessarily require substitution with another protein source as the level of protein intake is high in typical European diets (Westhoek et al. 2014). At the current time, there is little evidence to suggest that European diets are likely to change enough to significantly influence grain legume production.
Fig. 5

Changes in the production of meat and corresponding changes in fertilizer N use, protein crop production and net soybean import (in million tons) for the EU-27 (1961–2011). A more than twofold increase in meat production during this time span raised the (protein) feed demand which was met through a modest increase in domestic production of grain legumes and fertilizer-nitrogen consumption as well as a substantial increase in soya imports. The calculations are based on data from FAOstat (2013)

3.2.3 Health impact of legumes

The polyphenols, proteins and phytoestrogens present in grain legumes are associated with various health effects. Increased consumption of grain legumes as well as consumption of targeted functional foods and dietary supplements (or nutraceuticals) based on legumes could help in realizing their positive health effects (Sirtori et al. 2009). Soybean and lupin proteins have the potential to reduce blood cholesterol and thus protect from hypercholesterolemia and atherosclerosis (Harland and Haffner 2008; Marchesi et al. 2008; Sirtori et al. 2012). In addition, lupin proteins are considered to have an antidiabetic effect (Bertoglio et al. 2011). Phytoestrogens from legumes can have potentially positive health effects, for example, reducing the risk of cancer and negative effects on the uterus, thyroid gland and mammary gland (Gierus et al. 2012). Yet, there is a concern about potentially detrimental effects of soybean phytoestrogens as well, e.g. on breast cancer and when used in infant-food formulas (Cederroth & Nef 2009). Soybean and soybean derivatives are already estimated to be found in about two thirds of all manufactured food products, resulting in an estimated intake of between 0.3 and 1.2 kg per person per year in the UK (McAusland 2015).

3.2.4 Grain legumes in feed

As discussed earlier, the current demand for grain legumes for feed is largely a result of increased meat consumption in the EU (Smil 2002; de Boer et al. 2006; Cavaillès 2009). The prices of European-grown grain legume for animal feed are closely correlated with the world market price of imported soybean (Fig. 6). According to LMC International (2009a), the price of field pea for animal feed is correlated to that of soybean meal and wheat, because feed compounders often replace peas with a mixture of wheat and soybean. Prices have risen sharply since 2007, and as a result, the cost of the net imports of soybean and soybean cake has doubled compared to the average over the previous 30 years, amounting to $15.5 billion in 2012 (FAOstat 2015). Soybean is currently imported without duties (Bindraban and Rabbinge 2011). As prices rose, import quantities have decreased markedly from 35 million tons of soybean cake (from cake or bean imports) in 2007 to 27 million t in 2012. There is currently no restriction on the import of genetically modified (GM) soybean for animal feed, but there is a market demand for GM-free produce. A study estimates that if one quarter of EU soybean imports were GM-free, the increased demand would raise the price of GM-free soybean by 55 € t−1 (Aramyan et al. 2009), which could also result in increased prices for European-grown legumes. Even under this scenario, the profitability of legumes relative to other European crops may not change dramatically as prices of alternative feed compounds may also be raised.
Fig. 6

Changes in producer prices for main protein crops, rapeseed and wheat in major producer countries (1990–2010). The calculations are based on data from FAOstat (2013). Note that prices are averages for major EU producer countries: Bulgaria, France, Poland, Spain and the UK

European-grown legume grain is undervalued in the feed market in relation to its feed value. A mix of domestic legume grains and cereals is often cheaper than an equivalent feed mix of soybean and cereals (Sauermann 2009), and especially so with the recent soybean price increases and a rising demand for GM-free soya from sectors of the market such as organic products (Aramyan et al. 2009).

In order to calculate the ‘feed value’ of a feed component, we can calculate the amount of that component needed to replace a standard wheat soybean mixture, based on lysine and metabolisable energy (LLH 2012). For given wheat and soybean market prices, faba bean and pea have been undervalued since 2010. In 2014, a gap between market value and the value based on nutritional characteristics was more than € 100 t−1 (+55 %) for field pea and € 28 t−1 (+10 %) for faba bean. One reason for this gap in price between locally produced grain legume and imported soybean may be that feed compounders prefer larger and more homogenous quantities from large-scale overseas sources (Sauermann 2009; LLH 2012). Closure of the gap could lead to market responses and an increase in European-grown grain legumes for feed production.

3.3 Relative gross margin of legumes

The high gross margins from starch-rich cereals are a major driver of simplification and specialization trends. European grain legumes have been shown to have higher gross margin deficits of between 70 and several hundred euros per hectare than other crops in a range of EU countries (Kamp et al. 2010; Mahmood 2011; LMC International 2009b). Grain legumes were competitive with an alternative crop at only four sites (LMC International 2009b; Mahmood 2011; Zilles 2010; Riedesser 2012). However, the gross margins are often compared to the regionally most profitable crop, e.g. wheat, although in reality, competitiveness with a crop of average profitability or with a similar agronomic role in the crop rotation may be sufficient to make farmers decide to grow legumes. Gross margin calculations are not, however, able to take into account the non-market outputs, the long-term economic impacts or possible savings of labour and machinery use associated with grain legumes (Weitbrecht and Pahl 2000).

Preissel et al. (2015) showed that the consideration of pre-crop effects substantially increases the number of situations where grain legumes can compete with cereals. It also has a small positive effect on their competitiveness compared to alternative break crops. The value of N fertilization savings (see Section 4.1) due to BNF depends largely on N fertilizer prices that have doubled since 2000 (EUROSTAT 2015). Westhoff (2009) argues that increasing energy prices directly impact N fertilizer prices but also might drive up demand for energy crops and thereby world food prices as well. This economic scenario may stabilize the current fertilizer-to-product price ratio and the reliance on manufactured fertilizers instead of BNF. Underestimation of the provision of N from BNF and low fertilizer-to-product price ratios decrease farmers’ interest in intercropping, mixed cropping or crop rotations with legumes.

4 Factors affecting internal non-market outputs

As legumes are not always competitive in terms of marketed outputs alone in Europe, economic returns from non-marketed products and services may play an important role in influencing farmers to grow legumes. The larger the economic rewards for non-market goods and services that are available to the farmer, the higher the chance that legume crops are included in farming system.

4.1 Nitrogen fixation

From an agro-economic viewpoint, BNF can be regarded as an additional output from the grain legume enterprise, enabling cost savings for (mineral or organic) fertilizer purchases and application. The availability of nitrogen (N) from BNF reduces the need for N fertilizers in the legume crop to almost zero. Nitrogen from BNF remaining in above and below ground crop residues after harvest of the grain can be utilized by subsequent crops. Whereas the low N requirements of legumes are directly reflected in their gross margins, the N provision to subsequent crops is not usually valued economically. It is not considered in standard gross margin methods and is therefore not used explicitly to inform farmers’ decisions made using gross margins. In reality, farmers do not always change their fertilizer application rates in crops following legumes (Preissel et al. 2015), although fertilizer recommendations do take this into account in some countries (see for example Defra 2010).

The most widely grown grain legumes in Europe, field pea and faba bean, accumulate on average 130 and 153 kg N ha−1 in their aboveground biomass through BNF (Peoples et al. 2009b). Large quantities may also be accumulated in below-ground biomass associated with nodules and roots representing 30–60 % of the total N accumulated by legumes (Peoples et al. 2009b). The effects of nitrogen fixation on subsequent crops will depend on the species and amounts of N fixed as well as environmental conditions. For example, N uptake in subsequent crops has been reported to be increased by 23–59 % after field pea and narrow-leafed lupin on different soil types in Denmark (Jensen et al. 2004), but only 14–15 % for durum wheat following vetch in a semi-arid Mediterranean environment (Giambalvo et al. 2004). In practice, an actual reduction in N fertilizer use in subsequent crops will depend on the economic trade-off between securing maximum yields and maximizing N savings (Preissel et al. 2015). At low N fertilizer prices relative to product prices, maintaining high yields is more important than fertilizer savings, resulting in minimal fertilizer savings. Surveys among farmers and experts suggest that the reductions in applied fertilizer to crops following legumes are comparable to the potential N supply of the legume residues, for example, fertilizer savings of between 20 and 30 kg ha−1 (Alpmann et al. 2013) compared with 18–27 kg N ha−1 residual N of lupin and pea measured in the subsequent winter barley on a loamy soil (Jensen et al. 2004).

4.2 Savings from pest control services

Grain legumes are generally not susceptible to the same pests and diseases as the main cereal crops, and thus, they can break the life cycle of these diseases and pests, reducing their incidence and/or severity in the following crop. This is particularly true for soil-borne root diseases such as take-all (Gaeumannomyces graminis) of cereals (Kirkegaard et al. 2008). This break crop effect makes it possible for farmers to reduce pesticide applications in subsequent crops compared to repeated cereal cropping. von Richthofen et al. (2006) found that one fungicide application and one application of selective herbicides against grassweeds could be omitted in cereals grown after legumes with an associated reduction in agrochemical costs of 20–25 % for the succeeding crop and costs savings of up to 31 € ha−1. Better recognition of the potential to reduce agrochemical applications and thus expenditure in rotations with grain legumes could make grain legumes more attractive to farmers. However, legumes can also increase the incidence of some diseases, and a 3–4-year interval between successive legume crops is required to control broad-spectrum diseases such as Sclerotinia sclerotiorum, Rhizoctonia solani and Aphanomyces (Skuodiene and Nekrosiene 2012).

4.3 Yield enhancement of subsequent crops

Introducing grain legumes into cereal-dominated rotations common in much of Europe could lead to a significant increase in cereal yields. In an overview of European experiments, yields of cereals following grain legumes were mostly 0.5 to 1.6 t ha−1 than after cereal pre-crops in temperate conditions, and mostly 0.2 to 1.0 t ha−1 in Mediterranean conditions (Preissel et al. 2015). Yield of crops following legumes is often enhanced due to the combined and interrelated effects of N provision, pest and disease suppression, improved soil properties and other non-N effects. This positive effect on yield may affect a second or even third crop after the legume (Evans et al. 2003), although this effect is not always found in European experiments (e.g. Charles and Vuilloud 2001; Maidl et al. 1996; Dachler and Köchl 2003). The N-related yield effects are greater in low fertility situations (Preissel et al. 2015). In situations with adequate N supply, the yield increase to the subsequent crop is mostly from the ‘break crop effect’ of legumes and other pre-crops such as rapeseed can also produce similar effects. The size of the yield increase varies also with site characteristics and growing conditions (Bachinger and Zander 2007; Kirkegaard et al. 2008). A producer survey in Germany (Alpmann et al. 2013) reported yield increases between 0.5 and 1 t ha−1 when wheat and barley were grown after grain legumes. However, in semi-arid conditions of central Spain, lower yield effects of grain legumes were found, for example, yield increases of 0.2 t ha−1 for barley following vetch (López-Fando and Almendros 1995). In standard accounting, the increase in yield of the subsequent crop and its economic value are attributed to the following crop and not the grain legume. Consideration of economic and environmental effects at the cropping system level rather than the individual crop level would help farmers improve the valuation of grain legumes as proposed in a recent assessment framework (Reckling et al. 2015b, in press).

5 Factors affecting external impacts of legumes

5.1 Biodiversity enhancement

Grain legume production increases the diversity of European cropping systems as grain legumes are minor crops throughout Europe and enable temporal and spatial diversification of the agro-ecosystem at the field and landscape level (Peoples et al. 2009b). Increased crop diversity supports increased above and below ground biodiversity (Köpke and Nemecek 2010) including decomposer invertebrates such as earthworms and Collembola (Eisenhauer et al. 2009; Sabais et al. 2011) and pollen- and nectar-gathering wild and domesticated bees as well as bumblebees that are attracted by the crop’s mass-flowering habit (Stoddard and Bond 1987; Palmer et al. 2009; Green et al. 1980; Köpke and Nemecek 2010; Westphal et al. 2003). However, benefits of increased diversity of crops and associated diversity are not rewarded in current markets due to institutional failures (Perrings 2001; Pascual and Perrings 2007).

5.2 Emission reduction in crop production

5.2.1 Nitrate leaching

Emissions of reactive N to water through nitrate leaching and to the atmosphere through ammonia, nitrous and nitrogen oxide emissions cause nutrient and acid accumulation in vulnerable ecosystems (Galloway et al. 2004). The environmental damage has been estimated to cost 0.31 € kg−1 of N lost to the environment (von Blottnitz et al. 2006). In arable systems, contribution to nitrate leaching by legumes is conditioned by the crop management, the rotation design and the synchrony of crop N supply from legumes and the demand from following crops. Nitrate leaching can increase after the grain legume growth cycle as shown for selected cropping systems in Europe (Nemecek et al. 2008). Rotation design, cover crops (Plaza-Bonilla et al. 2015) and intercropping (Hauggaard-Nielsen et al. 2003) are measures to reduce nitrate leaching.

5.2.2 Gaseous emissions

Legumes have the potential to directly and indirectly reduce emissions of greenhouse gases and nutrients. Legumes indirectly reduce emissions of carbon dioxide as BNF saves the fossil energy resources required for manufacture of synthetic N fertilizers. Compared to cereals or pastures fertilized with N, legumes and legume-based pastures can reduce fossil energy use by 35 to 60 % (Jensen et al. 2011). Using a life cycle assessment (LCA) approach, the introduction of grain legumes into crop rotations has been estimated to reduce the emissions of ammonia by about 25 % and nitrous and nitrogen oxides by about 10 % (Nemecek and Baumgartner 2006; Cederberg and Flysiö 2004). In a review, Jensen et al. (2011) calculated average N2O emissions from grain legumes of 1.23 kg N2O–N ha−1 compared to 2.71 kg N2O–N ha−1 from annual non-legume crops using data from 71 site-years of crop experiments.

5.3 Soil improvement

Grain legumes have the potential to increase soil organic matter (Leithold et al. 1997) and improve soil structure through deep rooting of some species, for example lupin and low C/N ratios of crop residues that are closer to that of soil properties than non-legume crops (Jensen et al. 2011). Switching from cereal monoculture and conventional tillage practices to a rotation with legume crops and reduced tillage is reported to stimulate the accumulation of 0.5–1.0 t ha−1 of soil organic carbon annually, with the legume component of the cropping sequence contributing up to 20 % of the carbon gain (Leithold et al. 1997; West and Post 2002; Wu et al. 2003; Hernanz et al. 2009).

The impact of grain legumes to soil structure and organic matter and their pest control service (see Section 4.2) is difficult to quantify in economic terms. However, some grain legumes can be introduced into reduced or zero tillage systems which reduce production costs substantially compared to ploughing. These cost savings are greatest when the change in tillage is combined with the diversification of the crop rotation by including a legume (Luetke-Entrup et al. 2006). In Mediterranean production systems, reduced tillage with grain legumes has shown especially positive economic effects due to increased water retention that often enhance crop yields (e.g. Lopez-Bellido et al. 2010; Sánchez-Girón et al. 2004; Soldevilla-Martinez et al. 2013).

5.4 Phosphorus mobilization

Phosphorus can be a major limiting factor for plant growth because of its low availability due to slow diffusion and high fixation in soils (Shen et al. 2011). Legumes are able to solubilize soil phosphorus through releasing root exudates that contain up to eight carboxylic acids (Egle et al. 2003). This can improve the phosphorus (P) uptake of a cereal grown intercropped in a mixture (Li et al. 2007) and also in cereals grown after a legume crop (Nuruzzaman et al. 2005). The deep rooting characteristics of some species such as lupin also contribute to efficient nutrient uptake from deep soil layers (Jensen and Hauggaard-Nielsen 2003). However, the amounts of phosphorus mobilization are small compared to their phosphorus demand and vary depending on genotype and environment and can therefore be neglected in economic analysis.

5.5 Emission reductions from animal production

LCA studies have compared livestock products produced using European-grown grain legumes with products from soybean-based feed (Cederberg and Flysiö 2004; Eriksson et al. 2004; van der Werf et al. 2005; Baumgartner et al. 2008; Topp et al. 2012). Partially replacing imported soybean with EU-produced field pea, faba bean or lupin in feed rations has been shown to significantly reduce energy demand, GHG emissions and acidification potential—other EU-produced legume crops may have a similar potential. Furthermore, on-farm feeding of home-grown legumes reduces transport and facilitates nutrient cycling between crops, animals, manure and soil (Baumgartner et al. 2008; Cederberg and Flysiö 2004; Eriksson et al. 2004). However, the feed quality of on-farm-produced mixtures may be lower than that from feed compounders due to limited options to optimize feed rations. Baumgartner et al. (2008) suggested that current feed optimization models defining the most cost-effective feeds should be extended to include environmental optimization criteria. However, even a significant increase in European production of grain legumes would only satisfy a small share of the European feed demand at current levels of crop yield, animal production and consumption.

6 Impact of subsidies and other policies on the European Union

6.1 History of direct subsidies for legumes

Support for grain legume production in the EU (Table 2) was initiated in the 1970s and focused on feed production, whereas grain legumes for food uses were not supported until the beginning of the 1980s (EEC 1974; EEC [Council of the European Communities] 1978; EEC [Council of the European Communities] 1989). With the MacSharry reform of 1992, price support was gradually replaced with an area payment in the form of a uniform basic amount multiplied with region-specific reference yields (EEC 1992). Since this regulation classified soybean as an oilcrop, it received far less subsidy than the other grain legumes classified as protein crops. The 1992 Blair House Agreement between the EU and the USA placed a number of restrictions on the support of certain oilseeds, including soybean, and limited the supported area to 5.5 M ha (EC-DG Agri 2011). It also allowed imports of protein crops and oilseeds without import levies. However, by the time the Blair House Agreement was implemented, soybean production was already contracting due to structural changes in agriculture in south-eastern Europe.
Table 2

Key policies related to grain legume production in the EU

Year

Regulation

Policy change

1974

Regulation (EEC) No 1900/74 of the Council of 15 July 1974

Introduction of price support to soybean producers

1978

Council Regulation (EEC) No 1119/78 of 22 May 1978

Introduction of price support to producers of pea, lupins and faba bean for feed uses, in 1982 for the same crops for food use

1989

Council Regulation (EEC) No 762/89 of 20 March 1989

Introduction of uniform area support for producers of chickpea, lentils and vetch grain (gradually increased from 75 to 181 ECU ha−1), maintained until 2006

1992

Council Regulation (EEC) No 1765/92 of 30 June 1992

MacSharry reform: Reduction of price support and gradual replacement with regionally uniform area payments. Lower support for oilcrops (incl. soybean) than for protein crops (pea, faba bean, lupins)

2003

Council Regulation (EC) No 1782/2003 of 29 September 2003

Inclusion of all area payments into the single payment scheme. Introduction of uniform area premiums for protein crops (pea, faba bean, lupins)

2005

Council Regulation (EC) No. 1698/2005 of 20 September 2005

Art. 39: Introduction of agri-environment schemes and rural development programme

2009

Council Regulation (EC) No 73/2009 of 19 January 2009

Art. 68: Introduction of optional direct support schemes for specific crops

2013

Regulation (EU) No. 1305/2013 and No. 1307/2013 of the European Parliament and of the Council of 17 December 2013

CAP reform: Introduction of ‘greening component’ to direct payments including diversification requirements and ecological focus areas, reform of rural development programme and voluntary direct support schemes

References: EEC [Council of the European Communities] 1974, EEC [Council of the European Communities] 1978, EEC [Council of the European Communities] 1989, EEC [Council of the European Communities] 1992; EC [Council of the European Union] 2003a, 2005, EC [Council of the European Union] 2009; EU, Union] 2013a, EU [European Union] 2013b

Between 2005 and 2006, all coupled payments were gradually replaced by regional Single Payment Scheme (EC 2003a). France and Spain made use of an exceptional rule allowing them to retain 25 % of the coupled payments until 2010. Protein crops were supported further by the ‘protein premium’ of 56 € ha−1 in 17 member states until 2012 (Austria, Belgium, Denmark, Finland, France, Germany, Greece, Ireland, Italy, Luxembourg, Malta, the Netherlands, Portugal, Slovenia, Spain, Sweden and the UK). Five member states (Lithuania, Slovenia, Hungary, Estonia and Poland) used Complementary National Direct Payments (CNDP) for new member states to support legumes (LMC International 2009a). Many regionally important grain legumes such as common bean and groundnut have never received EU-wide support.

The introduction of the Single Payment Scheme in the CAP has improved the relative profitability of grain legumes in low-yielding compared to high-yielding regions (LMC International 2009a; Kamp et al. 2010). As a result, field pea production areas increased in some countries with very low field pea yields, e.g. Greece and Spain, and areas declined in most other countries including some with very high field pea yields such as Belgium, France and the UK (Eurostat 2015). This development is reflected in a strong reduction in the average yield of grain legumes in the EU.

6.2 Subsidies to competing crops

Other policies have indirectly affected the economic attractiveness of legume crop production. The biofuel blending mandate, biofuel tax exemption (EC [Council of the European Union] 2003b; EC [Council of the European Union] 2003c) and incentive schemes for biofuel plants have indirectly supported the production of rapeseed processed to biodiesel and rapeseed meal. From 2004 to 2009, the CAP awarded a carbon-credit payment to biofuel producers of 45 € ha−1 (Robles 2011; Peri and Baldi 2013). In addition, increases in world market price of soybean in 2007 increased demand for the by-products of oil extraction for biodiesel, i.e. sunflower and rapeseed meal. As a consequence, production of bioenergy crops has increased greatly in the EU, and it can be assumed that grain legumes are among the crops replaced by these bioenergy crops and their by-products. For example, rapeseed acreage increased 600-fold in Romania in 2000–2009, whereas the soybean area decreased by almost 60 % (Popescu 2012). On a European scale, rapeseed and sunflower areas increased by 43 % from 2000–2013 while grain legume (incl. soybean) areas reduced by 33 % in the same period (FAOstat 2015).

6.3 Coupled support in the current and reformed Common Agricultural Policy

Under the current Common Agricultural Policy (CAP), there are very few market measures supporting grain legumes, except for a tariff on faba bean (3.2 %) and sweet lupin (2.5 %) (EC-DG Agri 2011). Direct support schemes exist under Pillar 1 (Council Regulation (EC) No. 73/2009, Art. 68; EC 2009). Member states may choose to provide direct payments for specific crops of up to 10 % of their annual national ceiling for agricultural subsidies. This is applied e.g. by Finland (78 € ha−1 in 2011), France (140 € ha−1 in 2011), Spain, Poland (163 € ha−1 in 2012), Lithuania and Slovenia. With the recent reform of the CAP, the option for voluntary coupled support was maintained (Regulation (EU) No. 1307/2013, Art. 52 and 53; EU 2013b), but the maximum volume is reduced to 8 % of the national ceilings or 13 % in specific cases. The scheme targets sectors, regions or types of farming that are ‘particularly important for economic, social or environmental reasons [and] undergo certain difficulties’ (Art. 52), including protein crops, other grain legumes and dried fodder including forage legumes. As an incentive to apply this support to ‘maintain the protein-based autonomy’ (Art. 1 §49) in livestock production, the maximum volume for coupled support can be increased by 2 % of the national ceiling when at least 2 % are used for supporting the production of protein crops (Art. 53). If fully taken up by member states, such schemes could have a significant impact on legume production, although the subsidy per hectare required to incentivize legume production may be high in some regions (Bues et al. 2013). This support scheme could also be applied, depending on approval by the European Commission, to support grain legume production for food markets. These provide an economic niche that would increase profitability of legume production, e.g. food pulses especially in Mediterranean regions or guaranteed GM-free food soybean.

6.4 Greening under the reformed Common Agricultural Policy

Under the reformed CAP, 30 % of direct payments to farmers (under pillar 1) are bound to the ‘greening component’ (Regulation (EU) No. 1307/2013, Art. 43; EU 2013b) to support ‘agricultural practices beneficial to the climate and the environment’ (Art. 1, §37), including two requirements that may support legume cultivation. ‘Crop diversification’ (Art. 44) requires farm holdings with 10–30 ha of arable land to cultivate at least two crops. Holdings with more than 30 ha are required to cultivate at least three crops, with the largest one and two crops covering not more than 75 and 95 % of the arable land, respectively. It is projected that these requirements will have a negligible effect on crop diversification towards legumes (Westhoek et al. 2011; European Society of Agronomy 2012) as most farms already comply and they do not encourage diversity between main types of crops such as cereals, oilcrops and legumes. There are also several exemptions, e.g. farm holdings with a large share of fallow, forage production or farms situated in the far north of the Union (Art. 44).

The second component requires farm holdings with more than 15 ha to establish ‘ecological focus areas’ (EFAs) on 5 % of the eligible arable land, with some exceptions (EU 1307/2013, Art. 46; EU 2013b), in order to ‘safeguard and improve biodiversity on farms’ (Art. 1 §44). Besides non-harvestable uses such as fallow and landscape features, EFAs may include, among others, cover crops and ‘nitrogen-fixing crops’ (Art. 46, §2), which are subject to weighting factors (EC [European Commission] 2014a, 2014b). Cultivation of legumes is weighted by the factor 0.7, which is higher than for other harvestable uses of EFAs. Thus, a 100-ha farm is required to grow almost 8 ha of legumes, or almost 16 ha of crops with cover crops (factor 0.3), or between 2.5 and 5 ha of fallow, agro-forestry or landscape features, among others (factors between 1.0 and 2.0). Member states are required to provide lists of N-fixing crops considered to benefit biodiversity and define accepted production methods. Input use is not restricted for legumes as EFAs in Germany. The increase in grain legume production areas in Germany in 2015 (BMEL 2015) was attributed to the incentivizing effect of the EFA requirements. This increase occurred even though other options such as cover cropping may be simpler.

6.5 Support to sustainable farming practices

The CAP’s second pillar, the Rural Development Programme (Regulation (EU) No. 1305/2013; EU 2013a), encompasses support to producer groups, agri-environment-climate-schemes and support to organic farming (Art. 27, 28 and 29); all of which have potential relevance for the promotion of legumes. Overall, the second pillar support amounts to 13 billion € per year for all Rural Development Programmes in the EU-28 (2014–2020; EU 2013b) and is therefore smaller in financial terms than direct support under the first pillar.

Table 3 shows ten EU member states that have agri-environment schemes that encompass legume production among their requirements or have the potential to indirectly support legume production. The reformed CAP provides for a maximum annual support of 600 or 900 € ha−1 for annual and perennial crops, respectively (EU 2013b, Art. 28). The ecological effectiveness of such policies clearly depends on the individual scheme’s design and is under debate (Kleijn et al. 2001; Marggraf 2003; van Hecken and Bastiaensen 2010; Uthes and Matzdorf 2013). However, as the decision to include legumes in the requirements is at the discretion of member states or regional authorities, the overall volume of support to legumes via this measure is comparably small, but may be very relevant in specific regions (Bues et al. 2013).
Table 3

Overview on agri-environment schemes in selected EU member states (date of information April 2013)

Country

Measures eligible for support

Belgiuma

Flanders: cultivation of forage legumes

Estoniab

Legumes on 15 % of the eligible land

Francec

Crop rotation (potential indirect effect on legumes)

Integrated fodder polyculture-breeding system (potential indirect effect on legumes)

Germanyd,e,f

North Rhine-Westphalia, Bavaria and Baden-Württemberg: crop diversification including the cultivation of legumes on at least 7 % of the arable land

Greeceg

Irrigated lucerne, maize, tobacco or cotton production with legumes as a winter cover crop on 20–35 % of the land

Hungaryh

Legume requirements are part of grassland and arable management three measures

Irelandi

Rural Environment Protection Scheme (REPS): incorporation of clover into grassland swards

Italyj

Emilia-Romagna: diversified rotations with cover crops (potential indirect effect on legumes)

Polandk

Sustainable farming system (potential indirect effect on legumes)

Preservation of endangered genetic plant resources in agriculture: local crop varieties commercial production and seed production (includes legumes)

Spainl,m

Castilla y León: crop rotation with introduction of legumes

Andalucía: integrated production of lucerne, several other measures may potentially affect legumes indirectly

Organic production systems are expanding in the EU, with the share of certified organic area growing from 3.6 % in 2005 to 5.8 % in 2013 (EUROSTAT 2015). In organic agriculture, the exclusion of synthetic fertilizers makes legumes essential (Watson et al. 2002). Therefore, the rules of organic production include the premise that ‘the fertility and biological activity of the soil shall be maintained and increased by multiannual crop rotation including legumes and other green manure crops’ (EC 2007, Art. 12b). Hence, legumes are considerably more widespread on organic than on conventional land, e.g. grain legumes (incl. soybean) were grown on 6.8 % of the organic arable area in 2013, about fourfold of their area share in conventional farming (EUROSTAT 2015). Conversion to and maintenance of organic farming is supported by several EU member states at a regional or national level, with the same maximum amounts applying as for agri-environment schemes (EU 2013b, Art. 29). The costs for supporting organic farming may be high but are partly paid by the consumers of organic products (Bues et al. 2013). Organic farming also benefits from the CAP reform in that organic farmers complying with the EU-organic farming regulations receive the ‘greening’ component of direct payments without specific conditions (EU 2013a, Art. 38).

Lastly, Rural Development Programmes can be applied to support the initiatives of producers, processors and market development for legume production or production of livestock with domestic protein feeds (maximum financial volume 100,000 € annually per measure).

6.6 Support outside the Common Agricultural Policy

Public support for legume cultivation can also come from outside the CAP. Support to research, breeding and technical progress in agriculture can bring substantial returns (Fuglie and Heisey 2007), and legumes are responsive to technical and breeding improvements (Zerhusen-Blecher and Schäfer 2013). The small size of the legume sector results in market failure in commercial plant breeding and technology development in this sector (Moran et al. 2007; Wiggering et al. 2012). Research and associated knowledge exchange programmes can help to improve the understanding and awareness of the economic and agronomic effects of legume production, described in Section 3. The successful development of the legume sectors in Canada and Australia has been greatly supported by extensive public agronomic research on these crops (Zentner et al. 2002; LMC International 2009a). Also, climate protection and nutrient policies could improve the attractiveness of legumes based on their non-market outputs (Section 3.3), e.g. through strengthening the current greenhouse gas cap-and-trade policy, installation of taxes on carbon or nutrients or harnessing of the Nitrates Directive, the Water Framework Directive or related national regulations. The Nitrates Directive together with other agricultural policies in the milk sector has already improved the relative economic performance of white clover-supported dairy production (Rochon et al. 2004).

7 Outlook

In order to meet the future demands for agricultural production while sustaining natural resources and improving environmental quality, future agriculture needs to be productive, resource-efficient and support biodiversity. At the current level of technology, legume-supported crop rotations can make a significant contribution to this as they demand less inputs than many crops, show a high level of resource use efficiency and support biodiversity.

Our analysis of marketed and non-marketed outputs of legume cultivation and related factors has exposed the mechanisms that have led to the decline of grain legumes in European agriculture. In the case of market outputs, competitive imported protein and the yield uncertainties of legumes have reinforced the relative higher profitability of cereals and hence their comparative advantage. There is a lack of mechanisms for valuing and rewarding the non-marketed products of grain legumes such as biodiversity as well as a lack of recognition of the system level internal effects of products such as biologically fixed nitrogen. Thus, current market mechanisms continue to support the trend towards specialization.

Increasing legume cultivation in Europe would support environmental improvement and resource use efficiency at a range of scales, from the field to the global. Their pre-crop effect, nitrogen provision and potential to improve nutrient conservation and biodiversity improve the sustainability of farm productivity while saving resources and reducing emissions. Against this background, it is important to discuss the possible measures to increase economic incentives for legume cropping and to facilitate their increased presence in European farmland.

7.1 Improving marketed outputs

Returns from marketed output of legumes or any other crop depend primarily on its yield and price. A continuing increase in soybean feed prices is expected due to the growing international requirements and a shift in demand towards GM-free produce. This could improve prices of EU-grown legumes and increase the gross margin of legume cultivation. In the absence of significant price increase of possible protein substitutes, yield improvements relative to other crops may be the most effective measure to improve the relative profitability of grain legumes. Key agronomic constraints that need to be addressed in order to increase grain legume productivity include (1) temporal yield stability, (2) pest, disease and weed management, and (3) improved crop rotation design to maximize rotational effects. The first two depend on breeding advances. Promising agronomic innovations include (1) soybean cultivation under cool growing conditions (Zimmer et al. 2016), (2) improved agronomy through on-farm research (Bloch et al. 2015) and (3) intercropping of grain legumes with cereals (Bedoussac et al. 2015).

Prices and demand for legumes can also be increased by exploiting niches for their production and marketing. Voisin et al. (2014) illustrate the development of regional specialty niches for selected lentil and bean varieties in regions of France that are supported through public labels such as protected geographical indication. Demand for high-value food grain legumes has stabilized their production in Mediterranean countries (see Section 3.2) and contributed to the high competitiveness of field pea and lentil production in Canada (LMC International 2009a; Zentner et al. 2002) and of chickpea production in Australia (Schilizzi and Kingwell 1999). Innovative examples of legume processing include the use of lupin in a number of new vegan products, e.g. PlantsProFood (Pro Lupin 2014), or the non-food sector, e.g. renewable resources for bio-refineries (Papendiek et al. 2012; Papendiek and Venus 2014). Another marketing possibility is provided by the increasing demand for organic food, as legumes are considerably more widespread in organic agriculture than on conventionally farmed land (see Section 6.5). Furthermore, grain legumes are a valuable component of crop rotations using reduced or zero tillage systems and increase the ability of this production system to save production costs (see Section 5.4). Growing consumer awareness of environmental performance of products offers further opportunities. In the same way that consumers are willing to pay for organic production methods, there may be a willingness to pay higher prices to reward lower impact production methods and products with less ‘food-miles’. The use of eco-labelling schemes could be a promising option here. Meynard et al. (2013) propose several levers that can be used to promote the development of grain legumes at different levels in the value chain providing examples from France. For field pea, they suggest (i) enhancing crop performance through technical and genetic improvements, demonstrating the effects on a rotation scale and developing regulatory incentives, and (ii) avoiding regular commodity markets by using varieties with specific qualities, reorganizing links between plant and animal supply chains and developing new outlets such as human nutrition.

7.2 Support for non-market outputs

7.2.1 Awareness among producers

In the case of non-market outputs of legume cultivation, the N supply, break crop effects, yield increases and cost-savings potential in subsequent crops are often disregarded at farm level. The rotation effects of legumes may be worth more than 100 € ha−1 (von Richthofen et al. 2006) but this increased economic performance is reflected in the gross margins of the subsequent crop, causing underestimation of the economic performance of grain legumes compared to alternative crops (Schneider 2008). To this end, modified gross margin analysis and new methods to evaluate legumes at the cropping system scale have been proposed by Reckling et al. 2015b, in press. In addition, a gradual increase in fertilizer-to-product price ratios will increase the relative economic performance further.

7.2.2 Policy

Agricultural policy has not realized its potential to reverse the decline in legume crop production. Policies to boost oilseed crop production for biofuels support or maintain conditions unfavourable for grain legumes. In France, Meynard et al. (2013) showed that providing direct subsidies did not lead to any structural change in the competitiveness of grain legumes. The current and post-reform CAP entails several options to support legumes based on their environmental effects, i.e. through greening requirements, through inclusion in agri-environment schemes or through support for organic farming. National policy will influence the production of grain legumes by deciding on the support for competing options for the targeting of environmental-based support. However, stronger mechanisms that extent beyond the CAP are required to adequately value non-market outputs of legumes, like overall policies on climate protection, biodiversity conservation and nutrient policies.

Dequiedt and Moran (2015) evaluated greenhouse gas abatement costs from an increased area of legumes in France and found that up to 0.8 Mt CO2 eq. could be mitigated for an average cost of 14 €/t CO2 eq. Higher mitigation targets would be associated with continuously increasing costs per additional t-CO2 eq. This example shows that legume-supported diversified production systems can be a low-cost mitigation option for national abatement goals. In order to tap any future carbon market opportunities, farmers need mechanisms that realize the value of carbon credits that they generate at farm level similar to those available for biofuel crops (Robles 2011). Nevertheless, Dequiedt and Moran (2015) report that current low prices of carbon credits ($5/tonne) may not sufficiently motivate farmers to increase legume cultivation.

8 Conclusions

Simplification and specialization trends in response to market signals in agro-ecosystems have weakened the position of legumes in Europe. This review provides valuable insights in their decline and offers possibilities for their revival. It is possible to improve the relative profitability of legumes in terms of marketed products by (1) devising policies aimed at increasing the prices of legume products, such as import restrictions of GM soybean or tariffs, (2) taking actions that reduce yield variability e.g. through investment in breeding and by (3) restricting the policies such as biofuel blending mandates that influence the relative profitability of the competing crops. In the case of non-market outputs and services, these are decisive in the argument to diversify cropping systems by including leguminous crops. The disregard of ecosystem services such as BNF and pest control, break crop effects and the absence of mechanisms to monetize the emission reduction and biodiversity enhancement services lead to suboptimal levels of economic returns from these services. It is also important to increase awareness of break crop effects as well as BNF gains from legume cultivation among farmers. Increased fertilizer-to-product price ratio can also influence their appreciation. In addition, methods to increase consumer awareness of environmental impacts of different production options can be explored.

The inherent combination of commodity outputs, non-market outputs and positive external impacts of legumes provides a rationale for public investment in long-term research to improve the internal outputs and their perception and CAP reforms aimed at rewarding the non-market outputs such as biodiversity enhancement and emission reduction. Increasing the non-market outputs under the Greening regulation and augmenting support to organic production systems probably will realize a significant increase in legume production in the EU. Nevertheless, development of niche markets, reforms in environmental policies, new mechanisms to appreciate non-market outputs including payment for ecosystem services and carbon markets, increased investment in research and development of legumes and increased flow of information on farming system effects are required to turn around the current decline of legumes in European landscapes.

Copyright information

© INRA and Springer-Verlag France 2016

Authors and Affiliations

  • Peter Zander
    • 1
  • T. S. Amjath-Babu
    • 1
  • Sara Preissel
    • 1
  • Moritz Reckling
    • 2
    • 3
  • Andrea Bues
    • 1
    • 4
  • Nicole Schläfke
    • 1
  • Tom Kuhlman
    • 5
  • Johann Bachinger
    • 2
  • Sandra Uthes
    • 1
  • Fred Stoddard
    • 6
  • Donal Murphy-Bokern
    • 7
  • Christine Watson
    • 3
    • 8
  1. 1.Institute of Socio-EconomicsLeibniz Centre for Agricultural Landscape Research (ZALF)MuenchebergGermany
  2. 2.Institute of Land Use SystemsLeibniz Centre for Agricultural Landscape Research (ZALF)MuenchebergGermany
  3. 3.Department of Crop Production EcologySwedish University of Agricultural Sciences (SLU)UppsalaSweden
  4. 4.Leibniz Institute for Regional Development and Structural Planning (IRS)ErknerGermany
  5. 5.Agricultural Economics Research Institute (LEI), Wageningen URDen HaagThe Netherlands
  6. 6.Department of Agricultural SciencesUniversity of HelsinkiHelsinkiFinland
  7. 7.Murphy-Bokern KonzepteLohne-EhrendorfGermany
  8. 8.Crop and Soil SystemsScotland’s Rural College (SRUC)AberdeenUK

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