PG Thesis

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Possibilities of using unsymmetrlcal dimethyl urea as Urease/Nltrlflcatlon inhibitor for Increasing the efficiency of nitrogenous fertilizers
(Department of soil science and agricultural chemistry, College of Agriculture, Vellayani, 1988) Asha Varughese
An Investigation was carried out at the College of Agriculture, Vellayanl, during the first crop season of 1987 to study the efficacy of the use of unsymmetrical dimethyl urea (UDMU) and neemcake (NC) In various combinations as urease/nitrification inhibitors for increasing the nitrogen use efficiency in wetland rice soils of Kerala. The initial analysis of the basic physico-chemical properties of the soil from the experimental site was done. UDMU was applied along with urea as mixed and in the coated form. Two levels of UDMU. via, 1/10th and 1/5th of the quantity of area were used for study. Neemcake was added at the rata of 40 kg/ha. Soil samples were withdrawn periodically from the experimental plots and analysed to the laboratory for estimating urea N, NH4 No2-N and contents in order to study tbs rate of mineralisation of urea. The experiment was carried out in a simple randomised block design with ten treatments and three replications