Abstract
Intercropping, i.e., simultaneously growing two (or more) species in the same field for a significant period of time but without necessarily concomitant sowing or harvest, is a practice aimed at eco-functional intensification.
This chapter integrates a comprehensive amount of original data from field experiments conducted since 2001 on spring and winter cereal-grain legume intercrops in experimental and farm contexts in France and Denmark, in an attempt to generalise the findings and draw up common guidelines. We have shown that intercrops appear to be a useful agronomic solution for organic arable cropping, particularly in low-N input systems, to enhance: (i) yields because of a general improvement of environmental resource use; (ii) cereal grain protein concentration due to a non-proportional competition for soil mineral N and other plant growth factors; and (iii) weed control compared to legume sole crops.
Therefore, intercropping can be a way to successfully produce organic grain legumes and cereals. However, it is difficult to propose generic crop technical protocols because of the multitude of production objectives and, hence, of combinations of species, varieties, densities, structure and manuring strategies.
Consequently, it should be emphasized that: (i) the species and varietal traits suited to intercropping and organic farming will make it necessary to reconsider the varietal selection criteria; (ii) further mechanistic understanding of the behaviour of intercropping systems is required to be integrated into crop models; and (iii) the development of intercrops cannot take place without the participation of all of the actors in the value chain because of lock-in mechanisms.
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Notes
- 1.
We considered the data subset for which all the variables needed for the calculation were available.
- 2.
YSC-Cereal = 2.9 ± 0.6 Mg ha−1 and YIC-Cereal = 2.0 ± 0.7 Mg ha−1on average.
- 3.
The nitrogen accumulated in the shoots of the intercropped legume was on average 54 ± 36 kg N ha−1, of which only 21 ± 24 kg N ha−1 came from the soil (the percentage of plant N derived from N2 fixation was determined using the 15N natural abundance method for unfertilised treatments, according to Amarger et al. (1979), Unkovich et al. (2008) and Bedoussac and Justes (2010a).
- 4.
Total available nitrogen (112 ± 38 kg N ha−1) was estimated as the sum of the N accumulated by the SC cereal (62 ± 21 kg N ha−1) and the soil N residue at harvest of the SC cereal (50 ± 28 kg N ha−1).
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Bedoussac, L. et al. (2014). Eco-functional Intensification by Cereal-Grain Legume Intercropping in Organic Farming Systems for Increased Yields, Reduced Weeds and Improved Grain Protein Concentration. In: Bellon, S., Penvern, S. (eds) Organic Farming, Prototype for Sustainable Agricultures. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-7927-3_3
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