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.
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ICRISAT Journal Article no. 600
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Giller, K.E., Nambiar, P.T.C., Srinivasa Rao, B. et al. A comparison of nitrogen fixation in genotypes of groundnut (Arachis hypogaea L.) using 15N-isotope dilution. Biol Fert Soils 5, 23–25 (1987). https://doi.org/10.1007/BF00264341
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DOI: https://doi.org/10.1007/BF00264341