Urea hydrolysis in semi-arid tropical alfisols and vertisols
2011
g w l jayakumar
The microplot method of experimentation was found to bemore suitable for measuring urea hydrolysis rates in thefield than the sampling of larger (4 m2) plots. Theaccumulation of N H -~N, NO; -N and NO; -N in soils and thedisappearance of urea could be measured with betterprecision, and the recoveries of nitrogen were better.The comparison between the data from the microplotexperiments and laboratory incubation studies indicated thaturea hydrolysis rates in the field could be predicted fromthe laboratory studies. This finding has to be examinedfurther with detailed experimentation. Further experimentsare also required to relate urease activity with soilvariables such as organic carbon and clay content, so thatmore general relationships can be generated in the presentstudy to prepare models for predicting urea hydrolysis inagricultural soils
Show more [+] Less [-]G W L Jayakumar, 'Urea hydrolysis in semi-arid tropical alfisols and vertisols', 2011
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