Abstract
Agriculture faces great challenges to ensure global food security by increasing yields while reducing environmental costs1,2. Here we address this challenge by conducting a total of 153 site-year field experiments covering the main agro-ecological areas for rice, wheat and maize production in China. A set of integrated soilâcrop system management practices based on a modern understanding of crop ecophysiology and soil biogeochemistry increases average yields for rice, wheat and maize from 7.2 million grams per hectare (Mg haâ1), 7.2 Mg haâ1 and 10.5 Mg haâ1 to 8.5 Mg haâ1, 8.9 Mg haâ1 and 14.2 Mg haâ1, respectively, without any increase in nitrogen fertilizer. Model simulation and life-cycle assessment3 show that reactive nitrogen losses and greenhouse gas emissions are reduced substantially by integrated soilâcrop system management. If farmers in China could achieve average grain yields equivalent to 80% of this treatment by 2030, over the same planting area as in 2012, total production of rice, wheat and maize in China would be more than enough to meet the demand for direct human consumption and a substantially increased demand for animal feed, while decreasing the environmental costs of intensive agriculture.
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Acknowledgements
We thank P. A. Matson, G. P. Robertson, I. Ortiz-Monasterio and G. Maltais-Landry for their comments on an earlier version of the manuscript or assistance during the manuscript revision, and we thank C. L. Kou, D. S. Tan, Z. M. Wang, Z. A. Lin, X. Y. Zhang, J. L. Gao and Y. Zhu for joining field experiments. We also acknowledge all those who provided local assistance or technical help to the Integrated Nutrient Management Network in China. This work was financially supported by the Chinese National Basic Research Program (2009CB118600), the Innovative Group Grant from the NSFC (31121062) and the Special Fund for Agro-scientific Research in the Public Interest (201103003).
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X.C. and F.Z. designed the research. Z.C., Z.W., M.Z., W.M., W.Z., X.Y., J.Y., X.D., Q.G., Q.Z., S.G., J.R., S.L., Y.Y., Z.W., J.H., Q.T., Y.S., X.P., J.Z., M.H., Y.Z. and J.X. conducted field experiments. Z.C., M.F., G.W., L.W., N.A., L.W., L.M. and W.Z. collected the data sets and analysed the data. X.C., Z.C. and P.V. wrote the manuscript.
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Extended data figures and tables
Extended Data Figure 1 The distribution of experiments for grain from 2009 to 2012 in China.
a, Rice (n = 57); b, wheat (n = 40); c, maize (n = 56). The background green colour represents the planting area for each crop; darker green means a larger density of planting area regionally for that crop. The dots represent sites, and each colour in a dot represents a year of measurements.
Extended Data Figure 2 Linear models of NH3 volatilization based on nitrogen application rate.
Rate of nitrogen fertilizer application was plotted against NH3-N volatilization for (a) rice (n = 265) (Supplementary Information, extended references 1â36 for rice), (b) wheat (n = 34) and (c) maize (n = 29) (Supplementary Information, extended references 37â60 for wheat and maize) growing seasons, respectively. **P = 0.01. Filled and hollow circles represent data from Chinese journals (or theses) and ISI journals, respectively.
Extended Data Figure 3 Exponential models of N2O emissions and nitrogen leaching based on nitrogen surplus.
Nitrogen surplus was plotted against N2O-N emissions for (a) rice (n = 118) (Supplementary information, extended references 7, 36, 61â84 for rice), (b) wheat (n = 40) and (c) maize (n = 48) growing seasons (Supplementary information, extended references 85â99 for wheat and maize), and against nitrogen leaching for (d) rice (n = 52) (Supplementary information, extended references 7, 100â113 for rice), (e) wheat (n = 59) and (f) maize (n = 56) (Supplementary information, extended references 44, 114â121 for wheat and maize). Nitrogen surplus was defined as nitrogen application rate minus above-ground nitrogen uptake. **Regression significant at PÂ <Â 0.01. Solid and hollow circles represent data from Chinese journals (or theses) and ISI journals, respectively.
Extended Data Figure 4 Exponential model of nitrogen runoff based on nitrogen surplus for rice production.
Nitrogen surplus was defined as nitrogen application rate minus above-ground nitrogen uptake (n = 81) (Supplementary information, extended references 8, 104, 122â134). **PÂ <Â 0.01. Solid and hollow circles represent data from Chinese journals (or theses) and ISI journals, respectively.
Supplementary information
Supplementary Information
This file contains an extended reference list for establishing the reactive N loss models, Supplementary Table 1, a Supplementary Discussion and additional references. (PDF 684 kb)
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Chen, X., Cui, Z., Fan, M. et al. Producing more grain with lower environmental costs. Nature 514, 486â489 (2014). https://doi.org/10.1038/nature13609
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DOI: https://doi.org/10.1038/nature13609
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