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Title: Biological Nitrogen Fixation: Enhancement Techniques
Contributor(s): Herridge, David  (author)orcid 
Publication Date: 2016
DOI: 10.1081/E-ESS3-120053890
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Abstract: Legume biological nitrogen fixation (BNF), resulting from the symbiotic relationship between legumes and rhizobia, a soil bacteria, is a key process in agriculture with the crop legumes alone supplying about 24 million tons of nitrogen (N) annually for global grain production. The specific amount of N fixed by a legume crop in a farmer's field essentially depends on the productivity of the crop and the level of soil mineral N in the field. Productivity can be enhanced by optimizing crop use of growing season and space, andnutrient and water resources, with careful attention to species and cultivar choice, planting time, row spacing and plant density, pest, disease and weed control, and crop nutrition. The suppressive effects of soil mineral N on BNF can be reduced through practices that lead to reductions in soil mineral N, such as notillage. Inoculation of legumes at sowing is another practice that can enhance BNF. It is virtually impossible to obtain accurate figures, but it is likely that about 50 million hectares of crop legumes, equivalent to about 25% of the area sown globally, are inoculated each year.
Publication Type: Book Chapter
Source of Publication: Encyclopedia of Soil Science, v.1, p. 227-231
Publisher: CRC Press
Place of Publication: Boca Raton, United States of America
ISBN: 9781498738934
Field of Research (FOR): 070302 Agronomy
070306 Crop and Pasture Nutrition
Socio-Economic Objective (SEO): 961402 Farmland, Arable Cropland and Permanent Cropland Soils
960904 Farmland, Arable Cropland and Permanent Cropland Land Management
HERDC Category Description: B3 Chapter in a Revision/New Edition of a Book
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Editor: Editor(s): Rattan Lal
Appears in Collections:Book Chapter
School of Environmental and Rural Science

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