Mineralization of soil organic nitrogen under waterlogged conditions in relation to other properties of tropical rice soils

    Sahrawat, K L (1983) Mineralization of soil organic nitrogen under waterlogged conditions in relation to other properties of tropical rice soils. Australian Journal of Soil Research, 21 (2). pp. 133-138. ISSN 0004-9573

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    Abstract

    The mineralizable nitrogen pool in wetland rice soils plays a dominant role in the nitrogen nutrition of rice even in fertilized paddies. There is a lack of information on how different soil properties affect ammonification of organic nitrogen in wetland rice soils. Surface samples of 39 diverse Philippine soils representing a wide range of pH, organic matter and texture were studied to determine the relationships between ammonification of organic nitrogen and soil properties. Simple correlation analysis showed that ammonium production was correlated highly significantly with total nitrogen (r = 0.94**), organic carbon (r = 0.91**) and C/N ratio (r = -0.46**), but it was not significantly correlated with cation exchange capacity, clay or pH. Multiple regression analayses showed that organic matter (organic carbon and total nitrogen) accounted for most of the variation in mineralizable nitrogen. These results suggest that organic carbon content is a good index of mineralizable nitrogen in tropical wetland rice soils.

    Item Type: Article
    Divisions: UNSPECIFIED
    CRP: UNSPECIFIED
    Subjects: Others > Soil Science
    Others > Fertilizer Applications
    Depositing User: Mr Sanat Kumar Behera
    Date Deposited: 30 Nov 2011 12:54
    Last Modified: 30 Nov 2011 12:54
    URI: http://oar.icrisat.org/id/eprint/4573
    Official URL: http://dx.doi.org/10.1071/SR9830133
    Projects: UNSPECIFIED
    Funders: International Rice Research Institute
    Acknowledgement: I thank the International Rice Research Institute for financial support and Dr F. N. Ponnamperuma, Principal Soil Chemist, IRRI, for helpful comments during planning work and preparation of the manuscript
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