Possibilities of using unsymnetrlcal Diaethyl urea as Urease/Nitrification inhibitor for Increasing the efficiency of nitrogenous fertilisers
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Date
1988
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Department of Soil Science and Agricultural Chemistry, College of Agriculture, Vellayani
Abstract
An Investigation was carried out at the College of Agriculture, Vellayani, during the first crop season of 1987 to study the effioacy of the use of unsymmetrical dimethyl urea (UDMU) and neemcake (KC) 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, viz. 1/10th and 1/5th of the quantity of urea were used for study, Reem- cake was added at the rate of 40 kg/ha. Soil samples were withdrawn periodically from the experimental plots and analysed in the laboratory for estimating urea-N,1 [102--K and N03_“k contents in order to study the g£0 0£ (Uineralisatlon of urea. The experiment was carried , simple randomised blook design with ten treatments and three replications. The study has revealed that unsymmetrical dimethyl urea is effective in inhibiting urease activity as well as nitrification. Increasing the level of UDMU from 1/10th to 1/5th of urea has a positive effect in increasing the nitrification inhibitory properties. Neemcake vias found to be ineffective in inhibiting ureahydrolysis, eventhough it can act as a nitrification inhibitor. Coating of UDMU with urea was observed less effective compared to the mixing of urea and UDMU.
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