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A comparison of nitrogen fixation in genotypes of groundnut (Arachis hypogaea L.) using 15N-isotope dilution |
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| Authors: | K E Giller P T C Nambiar B Srinivasa Rao P J Dart J M Day |
| Institution: | (1) Soil Microbiology Department, Rothamsted Experimental Station, AL52JQ Harpenden, UK;(2) International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru P. 0., 502324, Andhra Pradesh, India;(3) Present address: Department of Biochemistry, Physiology and Soil Science, Wye College, University of London, TN25 5AH Wye, Ashford, Kent, UK;(4) Present address: Research School of Biological Sciences, Australian National University, P.O. Box 475, ACT2601 Canberra, Australia |
| Abstract: | Summary Nitrogen fixation in seven groundnut genotypes was measured by 15N-isotope dilution using a non-nodulating cultivar of groundnut as the nonfixing reference plant. Nitrogen fixation varied between 100 kg N ha–1 in genotype J-11 and 153 kg N ha–1 in Robut 33-1. The amount of plant-available soil N was small, so that 86%–92% of plant nitrogen was derived from N2-fixation. Thus differences in N2-fixation between genotypes closely reflected differences in their total N accumulation.ICRISAT Journal Article no. 600 |
| Keywords: | N2-fixation Arachis hypogaea 15N isotope dilution Groundnut Rhizobium inoculation Plant available soil N |
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