Urea hydrolysis in semi-arid tropical alfisols and vertisols

    Jayakumar, G W L (1991) Urea hydrolysis in semi-arid tropical alfisols and vertisols. PHD thesis, Andhra Pradesh Agricultural University.

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    Supervisors

    Supervisors NameSupervisors ID
    Burford, J RICRISAT
    Shantaram, M VAPAU

    Abstract

    The microplot method of experimentation was found to be more suitable for measuring urea hydrolysis rates in the field than the sampling of larger (4 m2) plots. The accumulation of N H -~N, NO; -N and NO; -N in soils and the disappearance of urea could be measured with better precision, and the recoveries of nitrogen were better. The comparison between the data from the microplot experiments and laboratory incubation studies indicated that urea hydrolysis rates in the field could be predicted from the laboratory studies. This finding has to be examined further with detailed experimentation. Further experiments are also required to relate urease activity with soil variables such as organic carbon and clay content, so that more general relationships can be generated in the present study to prepare models for predicting urea hydrolysis in agricultural soils.

    Item Type: Thesis (PHD)
    Divisions: UNSPECIFIED
    CRP: UNSPECIFIED
    Subjects: Others > Soil Science
    Depositing User: Siva Shankar
    Date Deposited: 30 Aug 2011 05:15
    Last Modified: 30 Aug 2011 05:15
    URI: http://oar.icrisat.org/id/eprint/660
    Acknowledgement: UNSPECIFIED
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