Abstract
Nutrient inputs play a critical role in raising crops and livestock for food security, human nutrition and other uses in the bioeconomy. Their production and management must change so as to nourish crops, reduce harmful environmental impacts caused by nutrient losses and contribute to the restoration of soil health more effectively. A new paradigm for plant nutrition follows a food system approach in which multiple socioeconomic, environmental and health objectives must be achieved. The coming 10–20 years will be most critical for making the transition to a global food system in which all stakeholders look at food and nutrients in a holistic manner, including in regard to their hidden environmental, health and socioeconomic costs. Consumers, as well as governments and other stakeholders, need to support such a transformation, because farmers and the industry supporting them will not be able to implement all of the required actions alone. The outcome of this transformation will be a new societal plant nutrition optimum, rather than a purely economic optimum. The new nutrient economy will become an integral component of a low-carbon emission, environment-friendly and circular economy, supporting the food and nutrition requirements of a rising global population and improving the income and livelihood of farmers worldwide.
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1 Introduction and Background
World agricultural output has grown at an average annual rate of about 2.2% during the past 60 years, although with huge variations among countries (Fuglie 2018). Similar growth will be required in the near future to feed a growing world population and improve rural livelihoods. Over the longer term, slowing population growth, changing diets, reduced food losses and waste, and increased nutrient recycling will ease the pressure to produce more food and utilize more natural resources in that process.
Historically, economic development has been faster in regions of the world where fertilizer use and crop yields rose in parallel (McArthur and McCord 2017). The increasing access to mineral fertilizers has been one of the main factors in feeding the rapidly growing world population (Smil 2001). Rapid increases in crop yields also prevented a much larger expansion of agriculture into natural lands that would have otherwise occurred (Stevenson et al. 2013). On the other hand, in many regions, intensive farming to support the emerging food consumption patterns has resulted in nutrient-related externalities that are difficult to manage, such as land degradation, biodiversity loss, unsustainable water withdrawal, eutrophication of many freshwater and coastal marine ecosystems, increased greenhouse gas emissions or inequality among farmers (Balmford et al. 2018).
Anthropogenic perturbation levels of global nitrogen and phosphorus flows may already exceed limits that are deemed to be a safe operating space for humanity (Steffen et al. 2015). While agricultural activities at the farm level account for 9–4% of greenhouse gas (GHG) emissions from all human activities, a full accounting of the global food system, including land use change and fertilizer production, raises the figure to 21–37% (Rosenzweig et al. 2020). Human-induced emissions of nitrous oxide (N2O), which are dominated by fertilizer additions to croplands, have increased by 30% since the 1980s (Tian et al. 2020). Current food systems also favor the cultivation of staple crops at the expense of more micronutrient-rich food crops. While hunger and malnutrition have significantly declined in recent decades, they have stubbornly persisted in sub-Saharan Africa and other regions, including micronutrient-related deficiencies that particularly affect women and children (Pingali et al. 2017). The number of people who do not have access to sufficient and nutritious food may continue to rise again due to conflict, climate extremes, economic downturns, or outbreaks of diseases (FAO, IFAD, UNICEF, WFP and WHO 2020).
It has been estimated that $12 trillion in hidden health, environmental and socio-economic costs are associated with the global food system, which is larger than the system’s output at current prices (The Food and Land Use Coalition 2019). While food security through increasing crop and animal productivity will remain hugely important in light of an expected population of about 9.5 billion by 2050 (Vollset et al. 2020), it is no longer the only objective. The transition to a more sustainable global food system requires all stakeholders to manage nutrients and their entire life cycle in a more holistic manner. Future plant nutrition solutions will have to address multiple global and regional challenges related to nutrients in the food system.
In that context, there are ten higher-level questions that need to be resolved within the next 20 years:
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How can we overcome the current global nutrient imbalance? For many decades, rising crop and livestock production was closely coupled with increasing input of nitrogen and other nutrients, as well as international trade of feed and food. This has led to a global divide, ranging from large nutrient input-output surpluses and environmental pollution in some regions to large nutrient deficits in others (Fig. 2). On a global scale, how can future growth in primary crop production be decoupled from growth in fertilizer consumption? What are the country-specific targets and roadmaps for fertilizer use and nutrient use efficiency that will enable that?
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What are the key measures to double or triple crop yields in Africa with increasing and balanced nutrient inputs? Africa has massive nutrient deficits that must be overcome in order to increase crop yields and achieve higher levels of food security within one generation (van Ittersum et al. 2016). The average fertilizer use in sub-Saharan Africa is about 20 kg nutrients/ha and exceeds 50 kg/ha in only few countries, which is far below what is required to boost crop production and replenish soil fertility after decades of depletion (Fig. 1). Fertilizer alone will not be sufficient to lift crop yields, but it is a key ingredient to trigger an African Green Revolution (Vanlauwe and Dobermann 2020), which must be based on good information, incentives for the efficient use of nutrients, and specific measures to tackle the persistent forms of malnutrition as well.
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What data-driven technologies, business solutions and policies will accelerate the adoption of more precise nutrient management solutions by farmers? In many countries, farmers apply too great an amount of nutrients because they are relatively cheap or because they do not want to risk loss of yield. In other situations, farmers apply insufficient nutrients or in the wrong formulations because of lack of affordability, access, knowledge or data. Many good examples exist worldwide as to how to overcome this, but only a few have led to breakthroughs on a larger scale.
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Can nutrient losses and waste along the whole agri-food chain be halved within one generation? Current estimates suggest that, at the global scale, only around 20% of applied nitrogen compounds may reach useful products, with up to 80% lost to the environment in different forms (Sutton et al. 2012). There are huge variations in nutrient losses among countries and their food systems that can be addressed through various means, including greater recovery of nutrients from various waste streams in forms that allow for safe recycling back to crop production.
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How can nutrient cycles in crop and livestock farming be closed? Globally operating demand drivers and supply chains have caused a separation and concentration of crop and livestock farming, resulting in spatially disconnected, leaky nutrient cycles. The massive growth of the livestock sector has led to low nutrient use efficiency, increased waste and large greenhouse gas emissions. Global livestock supply chains account for one-third of all human-induced nitrogen emissions (Uwizeye et al. 2020). Sustainable livestock production includes more pasture-based systems and re-integration of crop and livestock farming to utilize animals for what they are good at: converting by-products from the food system and forage resources into valuable food and manure (van Zanten et al. 2019). What future farm structures, technologies and supply chains will enable that?
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How can we improve soil health? Soils are vital for growing crops, but they also support other essential ecosystem services, such as water purification, carbon sequestration, nutrient cycling and the provision of habitats for biodiversity. Carbon and nutrient inputs are important triggers for improving soil health in crop production, which also increases the resilience of farming systems to extreme climatic events. Sequestration of atmospheric CO2 in soils can contribute to reducing global warming and improving soil health, but requires continuous organic matter inputs and nutrient inputs (particularly nitrogen and phosphorus) to form stable soil organic matter. How can a holistic plant nutrition approach manage macro- and micronutrients for high crop productivity and nutrient use efficiency, but also utilize biological N fixation, optimize carbon storage and turnover, increase soil biodiversity, and avoid soil acidification or other forms of degradation?
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How should we manage the nutrition of crops in changing climates? Climate change has positive, as well as negative, impacts on the nutritional quality of crops, many of which are not yet well understood (Soares et al. 2019). Rising atmospheric carbon dioxide (CO2) may increase crop yields, but also cause declining nutrient concentrations and nutrient use efficiency of food crops. Global warming will increase the risk of crop stresses such as drought, heat or high radiation, for which balanced plant nutrition plays particular roles in mitigation. Changes in seasonality, precipitation and extreme weather events will also affect the timing and efficiency of nutrient uptake, requiring integration of nutrient advisories with early warning and climate information systems.
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What are realistic options and targets for reducing fertilizer-related greenhouse gas emissions? All pathways that limit global warming to 1.5 °C or well below 2 °C require land-based mitigation and land use change (IPCC 2019). Across the plant nutrition sector, low-emission “green” fertilizer production and transportation technologies, novel fertilizer formulations, inhibitors, and genetic solutions to nitrification inhibition or fixing atmospheric N, as well as more precise nutrient application and agronomic field management, offer numerous opportunities to reduce nutrient-related emissions of CO2 and N2O – provided that the surrounding policies and market conditions enable it.
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How can cropping systems deliver higher quality, more nutritious food? More than two billion people in the world are affected by various forms of micronutrient malnutrition. The world’s major cropping systems are designed to provide calories, protein and a number of other nutrients or bioactive compounds. A handful of micronutrient-poor crops dominate the global food and feed chains and have often decreased crop diversity or displaced traditional crops such as pulses. What agricultural practices can be deployed to improve human nutrition, including plant nutrition solutions (Welch et al. 2013)?
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How can we better monitor nutrients and implement high levels of sustainability stewardship? Digital technologies offer great potential for better monitoring, analysis, benchmarking, reporting and certification of sustainability efforts across the entire nutrient chain. This would improve transparency, traceability, quality control, and sustainability assessment in the whole food sector, and it is also critical for public sector engagement and evidence-based policymaking. How, for example, can the International Code of Conduct for the Sustainable Use and Management of Fertilizers (FAO 2019) or criteria for Environmental, Social, and Governance (ESG) be implemented by countries and industry? Is there a need for a new standard on sustainable production and the use of nutrients?
2 What Can Be Done?
Human development, biological process requirements and mass balance principles make it clear that mineral nutrients, including fertilizers, will continue to be major ingredients of future food systems. It is critical to develop integrated and targeted plant nutrition strategies and practices that minimize tradeoffs between productivity and the environment – and are viable in the farming and business systems of different regions, nations and localities. Integration in this context has several dimensions, including a multi-nutrient food system approach, greater recycling and utilization of all available nutrient sources, alignment with other agronomic and stewardship practices, and compliance with high sustainability standards.
The new paradigm of responsible plant nutrition encompasses a broad array of scientific and engineering know-how, technologies, agronomic practices, business models and policies that directly or indirectly affect the production and utilization of mineral nutrients in agri-food systems. Following a food system approach, responsible plant nutrition aims to:
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Improve income, productivity, nutrient efficiency and resilience of farmers and the businesses supporting them
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Increase nutrient recovery and recycling from waste and other under-utilized resources
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Lift and sustain soil health
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Enhance human nutrition and health through nutrition-sensitive agriculture
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Minimize greenhouse gas emissions, nutrient pollution and biodiversity loss
In a nutshell, responsible plant nutrition will contribute to a more nature-positive approach to food production and consumption. It does not aim to blindly copy nature, but, following science, it does adapt and integrate key agroecological principles (FAO 2018) in a tailored manner. Implementing the new paradigm involves six interdependent actions (Fig. 2):
Action 1: Sustainability-driven nutrient policies, roadmaps, business models and investments that create added value for all actors and beneficiaries in the nutrient chain. Nutrient policies and roadmaps must be tailored to the specific food systems in every country, including ambitious goals for nutrient use, losses and efficiency. Specific targets and priorities for managing nutrients will vary, depending on each country’s history and sustainable development priorities. Progressive science-based monitoring, stewardship (International Plant Nutrition Institute 2016) and certification schemes will guide performance and reward farmers and businesses for innovation, reduction of nutrient losses, improvement of soil health, enhancement of biodiversity and provision of other ecosystem services. Differentiated strategies will also lead to regional shifts in global fertilizer use, reducing nutrient surpluses and ensuring that more nutrients are moved to where they are most lacking, particularly in many parts of Africa (Zhang 2017).
Action 2: Data-driven, more precise crop nutrition solutions. Knowledge-driven digital solutions and disruptive technologies will allow for tailoring nutrient applications to local needs in an increasingly precise manner. Besides high-tech solutions for commercial farming, “low-tech” site-specific nutrient management approaches have shown consistent, large increases in crop yields and profits and nutrient use efficiency in many crops grown by smallholder farmers in Asia and Africa (Dobermann et al. 2002; Rurinda et al. 2020). They now need to be upscaled to millions of farmers through digitally supported advisory systems and business solutions.
Action 3: Circular economy solutions for greater nutrient recovery and recycling. Crop-livestock integration, less food waste, use of by-products and increased nutrient recovery and recycling are key measures to optimize nutrient use efficiency across the full food chain (Fig. 3). Political incentives, novel technologies and shifts in behavior will drive greater nutrient recycling from multiple waste streams, as a key contribution to circular, bio-based economies. Such circular systems need to be safe and healthy for animals, humans and the environment, but they also allow for the creation of novel business models, including side-streams within the agricultural sector for the up-cycling of materials and the nutrients that they contain. Improved full-chain nutrient flow monitoring, life-cycle analysis, benchmarking and certification will support the development of such solutions.
Action 4: Nutrition-sensitive farming – producing food crops with higher nutritional value to address persistent, as well as emerging, mineral nutrient deficiencies. Besides dietary diversification and food interventions, plant nutrition solutions are part of strategies for addressing the triple burden of undernutrition, micronutrient malnutrition, overweight/obesity and other non-communicable diseases. Depending on the local context, nutrition-sensitive crop production may include more diverse crop rotations, as well as biofortification of staple crops with micronutrients through breeding and/or fertilizers (Cakmak and Kutman 2018). The latter involves the targeted use of fertilizer products that deliver micronutrients of importance to crops, animals and humans. Besides essential plant nutrients such as iron or zinc, this may also include nutrients that are of particular importance to animals and humans, such as iodine (Fuge and Johnson 2015) or selenium (Alfthan et al. 2015).
Action 5: Energy-efficient, low-emission fertilizers. Fertilizers will increasingly be produced in an environmentally-friendly manner, and they will embody greater amounts of knowledge as to how to control the release of nutrients to the plant. Significant reductions in pre-farm greenhouse gas emissions can be achieved through low-carbon emission fertilizer production. Various new technologies are already being piloted to produce “green ammonia” from renewable, carbon-neutral energy sources, as well as to use it for energy storage and transport. A new “ammonia economy” could feed and power the world in a whole new, decentralized manner (Rouwenhorst et al. 2019). Innovation in fertilizer formulation will lead to environmentally-friendly fertilizers that maximize nutrient capture by the crop and minimize losses of nutrients (Chen et al. 2018).
Action 6: Accelerated, more open innovation systems for faster translation of new ideas into practice. Future research and innovation systems need to foster the co-creation and sharing of knowledge for rapid development and deployment of new know-how and technologies. This requires more openness and coordinated action from public and private sector players. A massive cultural change is needed in science and science funding, towards a problem-focused and leaner science approach, transdisciplinary collaboration, entrepreneurship, and early engagement with users – including the full diversity of farmers.
Who needs to do what?
Responsible plant nutrition is a complex and global challenge, which can only be tackled through concrete action by all those directly involved in the nutrient cycle, as well as those influencing it (Fig. 4).
Policymakers at all levels need to create clear, science-based and harmonized regulatory frameworks for nutrients, but also dynamic policies that incentivize innovation in technologies, practices and business models. They must set out a clear vision for national or regional roadmaps with sound targets for nutrients, nutrition and environmental indicators. They can drive changes in food consumption, as well as provide progressive incentives for the adoption of better practices by farmers. Policies need to properly balance food production and environmental goals. Technical assistance and extension services must be supported adequately to promote sustainable practices. Policymakers also need to ensure that farmers all over the world have affordable access to the internet and digital services.
The global fertilizer industry has recently recognized the need for a sustainability- and innovation-driven plant nutrition approach as its core business strategy (International Fertilizer Association (IFA) 2018). Fertilizer companies will have to increasingly become providers of integrated plant nutrition solutions based on new business models that do what is right for people and the planet. Sustainability and innovation, including transparent monitoring and reporting, will drive the transformation strategy for the entire industry, for every product and solution sold. Revenue growth primarily needs to be driven by growth in the performance value offered to farmers and society, not in the volume of fertilizers sold.
Farmers, farm advisers and service providers carry the primary responsibility for improving nutrient use efficiency, reducing nutrient losses, recycling nutrients and promoting soil health at the farm scale, which has huge implications at larger scales. They need to be able to fully adapt and adopt new knowledge, technology, and services, and they need to be rewarded for good practices. Many farmers are entrepreneurs, and thus willing to change, and they are also aware of their role as stewards of land, water, climate and biodiversity. But doing things differently requires lowering risks and other adoption barriers.
Food traders, processors and retailers have enormous power to influence nutrient cycles, both through influencing what consumers eat or drink and how it is being produced. Vertically integrated, data-driven and more transparent supply chains that meet sustainable production standards and reduce production losses will become more widespread, including more direct sourcing from farmers. These developments offer numerous opportunities for implementing more holistic approaches to nutrient management. Monetizing such sustainable production practices is both a key challenge and an opportunity.
Consumers will drive significant changes in plant nutrition through changes towards healthier diets, as well as an increasing emphasis on food that is produced in a more sustainable manner. Specific trends will differ among regions and income groups. On a global scale, changes in food behavior may be relatively slow and will also be partly compensated for by growing food consumption due to rising populations and income growth in low and middle income countries. However, an immediate responsibility of consumers is to reduce excessive meat consumption, waste less food and ensure recycling of the waste that does occur.
Utility service providers and waste processors are an important and relatively new category of actors in the nutrient cycle, but their role will increase substantially in the coming years. Particularly in densely populated areas, their needs and actions will increasingly co-define how farming and nutrient management will be effected. This requires deepening the collaboration with other groups of actors and jointly developing a common understanding, as well as common standards to meet.
Investors: Investment in plant nutrition research and innovation will need to increase massively in order to meet the complex plant nutrition challenges we face. Public, private and philanthropic investors should increasingly invest in technologies, businesses and organizations that support key elements of the new paradigm, including creating a growing ecosystem of startup companies and other enterprises. Use of blended public and private capital can de-risk and leverage more private investment.
Scientists: Science and engineering will underpin all efforts to achieve the multiple objectives of the new plant nutrition paradigm, but the entire science culture must change too, towards new ways of working that stimulate new discoveries and achieve faster translation into practice. Greater focus on explicit pathways to agronomic applications, reality checks and rigor in claims of utility are needed, as well as more sharing of know-how and critical resources, more open innovation and more entrepreneurship.
Civil society organizations play significant roles in the new paradigm through informing the public, grassroots mobilization, monitoring, alerting and influencing, and inclusive dissemination of new technologies and practices. This is a big responsibility, which should follow an evidence-based approach. The co-development of concrete solutions in partnership with government, industry, science and farmers should replace the all too prevalent emphasis on single issues or controversial debates.
What will success look like?
Compared to where we are in 2020, the following concrete outcomes can be achieved within one generation, by 2040:
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Widely accepted standards for quantifying and monitoring nutrients along the food supply chain inspire solutions for improving overall nutrient use efficiency, increasing recycling and reducing nutrient waste across the whole agri-food system. Ambitious targets, policies and investments stimulate collective actions by governments, businesses, farmers and other stakeholders towards sustainable, integrated, and tailored plant nutrition solutions.
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On a global scale, crop yield growth meets food, feed and bio-industry demand and outpaces growth in mineral fertilizer consumption, while cropland expansion and deforestation have been halted. Global crop nitrogen use efficiency – the nitrogen output in products harvested from cropland as a proportion of nitrogen input – increases to 70%.
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Through responsible consumption, increased recycling, and better management practices, nutrient waste along the food system is halved. Nitrogen and phosphorus surpluses in hotspots are reduced to safe levels that minimize eutrophication and other environmental harm.
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Soil nutrient depletion and carbon loss are halted. Forward-looking policies and investments trigger changes in farming systems and management practices that increase soil health, including soil organic matter. Regional soil nutrient deficits are reduced substantially, particularly in sub-Saharan Africa, where fertilizer use has tripled and crop yield has at least doubled, including improved nutritional outputs. Millions of hectares of degraded agricultural land are restored, including through the use of mineral and organic fertilizers and nutrient-containing waste or by-products.
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Extreme forms of chronic hunger and nutrient-related malnutrition are eradicated through integrated strategies that include the targeted use of micronutrient-enriched fertilizers and nutrient-biofortified crops. A new generation of more nutritious cereals and other staple crops is increasingly grown by farmers, driven by consumer and market demand. Policy and decision-makers support mineral fertilization strategies for meeting specific human nutritional needs where markets do not provide the needed incentives.
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The fertilizer industry follows rigorous and transparent sustainability standards for the entire life cycle of its products and business operations. Greenhouse gas emissions from fertilizer production and use are reduced by at least 30% through increased energy efficiency, carbon capture and storage and other novel technologies and products. At least 10% of the world’s fertilizer-N is produced from green ammonia with very low or zero carbon emission.
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R&D investments in plant nutrition research and innovation by public and private sector are tripled compared to present levels. Many companies spend 5% or more of their gross revenue on research and innovation. Collaborative, open innovation approaches allow for scientific discoveries to become quickly translated into practical solutions and knowledge. Innovative, value-oriented business models drive growth throughout the industry.
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8.
Consumers appreciate the benefits of plant nutrients, including mineral fertilizers as a primary nutrient source. A nutrient footprint standard with high visual recognition informs consumer choices. Information on improvement of soil health and nutrient balances is widely available, and their linkage to the mitigation of air, water and climate issues will be broadly acknowledged.
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9.
Farmers all over the world have access to affordable, diverse and appropriate plant nutrition solutions, and they are being rewarded for implementing better nutrient management and stewardship practices that increase their prosperity and enable them to exit poverty traps. Customized crop nutrition products and solutions account for at least 30% of the global crop nutrition market value.
So far, we have failed to achieve the goals stated above, despite many scientific and technical solutions that have existed for decades. Achieving it now, within one generation, will require a far more concerted effort by everyone involved, from the fertilizer industry to farmers and consumers of food and other agricultural products. Fast action – grounded in long-term sustainability thinking – is needed to facilitate the transition towards a new paradigm for plant nutrition.
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Dobermann, A. et al. (2023). A New Paradigm for Plant Nutrition. In: von Braun, J., Afsana, K., Fresco, L.O., Hassan, M.H.A. (eds) Science and Innovations for Food Systems Transformation. Springer, Cham. https://doi.org/10.1007/978-3-031-15703-5_19
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