Closing yield gaps through nutrient and water management

Mueller, N.D. and Gerber, J.S. and Johnston, M. and Ray, D.K. and Ramankutty, N. and Foley, J.A. (2012) Closing yield gaps through nutrient and water management. Nature. pp. 1-4.

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In the coming decades, a crucial challenge for humanity will be meeting future food demands without undermining further the integrity of the Earth’s environmental systems1, 2, 3, 4, 5, 6. Agricultural systems are already major forces of global environmental degradation4, 7, but population growth and increasing consumption of calorie- and meat-intensive diets are expected to roughly double human food demand by 2050 (ref. 3). Responding to these pressures, there is increasing focus on ‘sustainable intensification’ as a means to increase yields on underperforming landscapes while simultaneously decreasing the environmental impacts of agricultural systems2, 3, 4, 8, 9, 10, 11. However, it is unclear what such efforts might entail for the future of global agricultural landscapes. Here we present a global-scale assessment of intensification prospects from closing ‘yield gaps’ (differences between observed yields and those attainable in a given region), the spatial patterns of agricultural management practices and yield limitation, and the management changes that may be necessary to achieve increased yields. We find that global yield variability is heavily controlled by fertilizer use, irrigation and climate. Large production increases (45% to 70% for most crops) are possible from closing yield gaps to 100% of attainable yields, and the changes to management practices that are needed to close yield gaps vary considerably by region and current intensity. Furthermore, we find that there are large opportunities to reduce the environmental impact of agriculture by eliminating nutrient overuse, while still allowing an approximately 30% increase in production of major cereals (maize, wheat and rice). Meeting the food security and sustainability challenges of the coming decades is possible, but will require considerable changes in nutrient and water management.

Item Type: Article
Author Affiliation: University of Minnesota, St. Paul, Minnesota 55108, USA Nathaniel D. Mueller, James S. Gerber, Matt Johnston, Deepak K. Ray & Jonathan A. Foley,Department of Geography and Global Environmental and Climate Change Center, McGill University, Montreal, Quebec H3A 2K6, Canada
Subjects: Plant Production
Plant Protection
Divisions: General
Depositing User: Mr. SanatKumar Behera
Date Deposited: 04 Sep 2012 04:13
Last Modified: 07 Sep 2012 03:55
Official URL:

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