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Quantifying country-to-global scale nitrogen fixation for grain legumes II. Coefficients, templates and estimates for soybean, groundnut and pulses.
- Source :
-
Plant & Soil . May2022, Vol. 474 Issue 1/2, p1-15. 15p. 1 Diagram, 4 Charts, 2 Graphs. - Publication Year :
- 2022
-
Abstract
- Background: The demand for estimates of biological nitrogen (N) fixation inputs in agricultural systems is driven by the need to effectively manage the global N cycle. Scope: We present a methodology for quantifying N2 fixation 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-to-global scales. The coefficients 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 N2 (%Ndfa) for specific grain legumes and regions were determined in a companion paper. The grain legumes were estimated to fix a global total of 35.5 Tg N in the year 2018 - 25.0 Tg for soybean (Glycine max), 7.2 Tg for the pulses and 3.3 Tg for groundnut (Arachis hypogaea). Soybean dominated global grain legume N2 fixation, with 38 % of total N fixed associated with soybean in South and Central America and a further 22 % by soybean in North America. Conclusions: The updated estimates of N2 fixation by the grain legumes inform us of a substantial and increasing role that biological N2 fixation plays in global agricultural systems. The challenge remains to reliably estimate N inputs from other N2-fixing organisms that are active in these systems. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0032079X
- Volume :
- 474
- Issue :
- 1/2
- Database :
- Academic Search Index
- Journal :
- Plant & Soil
- Publication Type :
- Academic Journal
- Accession number :
- 157414553
- Full Text :
- https://doi.org/10.1007/s11104-021-05166-7