Plant and Soil

, Volume 174, Issue 1, pp 29–49

Sustainable agriculture in the semi-arid tropics through biological nitrogen fixation in grain legumes

  • S. P. Wani
  • O. P. Rupela
  • K. K. Lee
Article

DOI: 10.1007/BF00032240

Cite this article as:
Wani, S.P., Rupela, O.P. & Lee, K.K. Plant Soil (1995) 174: 29. doi:10.1007/BF00032240

Abstract

Sustainable agriculture relies greatly on renewable resources like biologically fixed nitrogen. Biological nitrogen fixation plays an important role in maintaining soil fertility. However, as BNF is dependent upon physical, environmental, nutritional and biological factors, mere inclusion of any N2-fixing plant system does not guarantee increased contributions to the soil N pool. In the SAT where plant stover is also removed to feed animals, most legumes might be expected to deplete soil N. Yet beneficial legume effects in terms of increased yields in succeeding cereal crops have been reported. Such benefits are partly due to N contribution from legumes through BNF and soil N saving effect. In addition, other non-N rotational benefits, for example, improved nutrient availability, improved soil structure, reduced pests and diseases, hormonal effects are also responsible. In this paper we have reviewed the research on the contribution of grain legumes in cropping systems and the factors affecting BNF. Based on the information available, we have suggested ways for exploiting BNF for developing sustainable agriculture in the semi-arid tropics (SAT). A holistic approach involving host-plant, bacteria, environment and proper management practices including need based inoculation for enhancing BNF in the cropping systems in the SAT is suggested.

Key words

inoculation legumes nonnodulation rhizobia residual effects symbiotic N2 fixation 

Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • S. P. Wani
    • 1
  • O. P. Rupela
    • 1
  • K. K. Lee
    • 1
  1. 1.International Crops Research Institute for the Semi-Arid Tropics (ICRISAT)Andhra PradeshIndia

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