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dc.contributor.authorM. B. Peoplesen_US
dc.contributor.authorJ. Brockwellen_US
dc.contributor.authorD. F. Herridgeen_US
dc.contributor.authorI. J. Rochesteren_US
dc.contributor.authorB. J.R. Alvesen_US
dc.contributor.authorS. Urquiagaen_US
dc.contributor.authorR. M. Boddeyen_US
dc.contributor.authorF. D. Dakoraen_US
dc.contributor.authorS. Bhattaraien_US
dc.contributor.authorS. L. Maskeyen_US
dc.contributor.authorC. Sampeten_US
dc.contributor.authorB. Rerkasemen_US
dc.contributor.authorD. F. Khanen_US
dc.contributor.authorH. Hauggaard-Nielsenen_US
dc.contributor.authorE. S. Jensenen_US
dc.description.abstractData collated from around the world indicate that, for every tonne of shoot dry matter produced by crop legumes, the symbiotic relationship with rhizobia is responsible for fixing, on average on a whole plant basis (shoots and nodulated roots), the equivalent of 30-40 kg of nitrogen (N). Consequently, factors that directly influence legume growth (e.g. water and nutrient availability, disease incidence and pests) tend to be the main determinants of the amounts of N2fixed. However, practices that either limit the presence of effective rhizobia in the soil (no inoculation, poor inoculant quality), increase soil concentrations of nitrate (excessive tillage, extended fallows, fertilizer N), or enhance competition for soil mineral N (intercropping legumes with cereals) can also be critical. Much of the N2fixed by the legume is usually removed at harvest in high-protein seed so that the net residual contributions of fixed N to agricultural soils after the harvest of legume grain may be relatively small. Nonetheless, the inclusion of legumes in a cropping sequence generally improves the productivity of following crops. While some of these rotational effects may be associated with improvements in availability of N in soils, factors unrelated to N also play an important role. Recent results suggest that one such non-N benefit may be due to the impact on soil biology of hydrogen emitted from nodules as a by-product of N2fixation. © 2009 Balaban, Philadelphia/Rehovot.en_US
dc.subjectAgricultural and Biological Sciencesen_US
dc.titleThe contributions of nitrogen-fixing crop legumes to the productivity of agricultural systemsen_US
article.volume48en_US Plant Industryen_US Department of Primary Industriesen_US Brasileira de Pesquisa Agropecuaria - Embrapaen_US University of Technologyen_US Mai Universityen_US Research Station Bannuen_US Tekniske Universiteten_US
Appears in Collections:CMUL: Journal Articles

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