Nitrogen accumulation in three legumes and two cereals with emphasis on estimation of N2 fixation in the legumes by the natural15 N-abundance technique

    Yoneyama, T and Nambiar, P T C and Lee, K K and Srinivasa Rao, B and Williams, J H (1990) Nitrogen accumulation in three legumes and two cereals with emphasis on estimation of N2 fixation in the legumes by the natural15 N-abundance technique. Biology and Fertility of Soils, 9 (1). pp. 25-30. ISSN 0178-2762

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    Abstract

    N accumulation and natural "N ahundance in three legumes (groundnuts, cowpeas, and soybeans) and in two cereals (sorghum and maize) were investigated over two seasons in Alfisols with and without N fertilization. Using the N uptake and natural "N abundance of non-nodulating plants as the indication of N derived from soil and fertilizer, the per cent N derived from atmospheric N2 was calculated for nodulated plants. In the first experiment, the groundnut genotype contained 85% atmospherc-derived N, but the percentage decreased with N application, Estimates of atmosphere-derived N by the N-difference and 15~-abundanctee chniques gave identical results. The percentages of atmosphere-derived N estimated by the two methods at different stages of groundnut growth were also similar. In the second experiment, atmosphere-derived N was estimated in plants grown with 0-200 kg ha-' applied N. The estimated atmosphere-derived N ranged from 42% to 61 % for groundnuts from 33% to 77% for cowpeas, and from 24% to 48% for soybeans, depending on the amount of N applied. Inoculation with a Bradyrhizobium strain increased the percentage of atmospherederived N in soybean plants grown without any fertilizer N. The natural "N abundance of sorghum and maize was very close to that of the non-nodulating groundnut, suggesting that these cereals can be used as reference plants in the estimation of atmosphere-derived N by the natural "N-abundance method.

    Item Type: Article
    Divisions: UNSPECIFIED
    CRP: UNSPECIFIED
    Subjects: Mandate crops > Groundnut
    Mandate crops > Sorghum
    Others > Food Legumes
    Depositing User: Ms Vibha Raju
    Date Deposited: 04 Dec 2011 11:43
    Last Modified: 04 Dec 2011 11:43
    URI: http://oar.icrisat.org/id/eprint/4451
    Official URL: http://dx.doi.org/10.1007/BF00335857
    Projects: UNSPECIFIED
    Funders: UNSPECIFIED
    Acknowledgement: UNSPECIFIED
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