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Pursuing sustainable productivity with millions of smallholder farmers.
- Source :
-
Nature [Nature] 2018 Mar 15; Vol. 555 (7696), pp. 363-366. Date of Electronic Publication: 2018 Mar 07. - Publication Year :
- 2018
-
Abstract
- Sustainably feeding a growing population is a grand challenge, and one that is particularly difficult in regions that are dominated by smallholder farming. Despite local successes, mobilizing vast smallholder communities with science- and evidence-based management practices to simultaneously address production and pollution problems has been infeasible. Here we report the outcome of concerted efforts in engaging millions of Chinese smallholder farmers to adopt enhanced management practices for greater yield and environmental performance. First, we conducted field trials across China's major agroecological zones to develop locally applicable recommendations using a comprehensive decision-support program. Engaging farmers to adopt those recommendations involved the collaboration of a core network of 1,152 researchers with numerous extension agents and agribusiness personnel. From 2005 to 2015, about 20.9 million farmers in 452 counties adopted enhanced management practices in fields with a total of 37.7 million cumulative hectares over the years. Average yields (maize, rice and wheat) increased by 10.8-11.5%, generating a net grain output of 33 million tonnes (Mt). At the same time, application of nitrogen decreased by 14.7-18.1%, saving 1.2 Mt of nitrogen fertilizers. The increased grain output and decreased nitrogen fertilizer use were equivalent to US$12.2 billion. Estimated reactive nitrogen losses averaged 4.5-4.7 kg nitrogen per Megagram (Mg) with the intervention compared to 6.0-6.4 kg nitrogen per Mg without. Greenhouse gas emissions were 328 kg, 812 kg and 434 kg CO <subscript>2</subscript> equivalent per Mg of maize, rice and wheat produced, respectively, compared to 422 kg, 941 kg and 549 kg CO <subscript>2</subscript> equivalent per Mg without the intervention. On the basis of a large-scale survey (8.6 million farmer participants) and scenario analyses, we further demonstrate the potential impacts of implementing the enhanced management practices on China's food security and sustainability outlook.
- Subjects :
- China
Decision Support Techniques
Edible Grain growth & development
Environmental Policy
Fertilizers statistics & numerical data
Food Supply methods
Greenhouse Effect
Nitrogen metabolism
Oryza growth & development
Triticum growth & development
Zea mays growth & development
Agriculture methods
Conservation of Natural Resources
Crops, Agricultural growth & development
Efficiency, Organizational
Farmers
Subjects
Details
- Language :
- English
- ISSN :
- 1476-4687
- Volume :
- 555
- Issue :
- 7696
- Database :
- MEDLINE
- Journal :
- Nature
- Publication Type :
- Academic Journal
- Accession number :
- 29513654
- Full Text :
- https://doi.org/10.1038/nature25785