Author(s) |
Herridge, David F
Giller, Ken E
Jensen, Erik S
Peoples, Mark B
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Publication Date |
2022-05
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Abstract |
<p><i>Background</i> The demand for estimates of biological nitrogen (N) fxation inputs in agricultural systems is driven by the need to efectively manage the global N cycle.</p> <p><i>Scope</i> We present a methodology for quantifying N<sub>2</sub> fxation by the grain legume-rhizobia symbioses that can be used for any year or sequence of years for which area and production statistics for legume oilseed and pulse crops were available and at country-toglobal scales. The coefcients used in the templates – harvest index, N harvest index, %N shoots, %N grain and a factor to account for below-ground N – were aggregated from 224 reports containing>4,000 observations. Values for the % total crop N derived from atmospheric N<sub>2</sub> (%Ndfa) for specifc grain legumes and regions were determined in a companion paper. The grain legumes were estimated to fx a global total of 35.5 Tg N in the year 2018 - 25.0 Tg for soybean (<i>Glycine max</i>), 7.2 Tg for the pulses and 3.3 Tg for groundnut (<i>Arachis hypogaea</i>). Soybean dominated global grain legume N<sub>2</sub> fxation, with 38% of total N fxed associated with soybean in South and Central America and a further 22% by soybean in North America.</p> <p><i>Conclusions</i> The updated estimates of N<sub>2</sub> fxation by the grain legumes inform us of a substantial and increasing role that biological N<sub>2</sub> fxation plays in global agricultural systems. The challenge remains to reliably estimate N inputs from other N<sub>2</sub>-fxing organisms that are active in these systems.</p>
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Citation |
Plant and Soil, 474(1-2), p. 1-15
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ISSN |
1573-5036
0032-079X
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Link | |
Publisher |
Springer Dordrecht
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Title |
Quantifying country-to-global scale nitrogen fixation for grain legumes II. Coefficients, templates and estimates for soybean, groundnut and pulses
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Type of document |
Journal Article
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Entity Type |
Publication
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