The results of a field experiment to study the effect of neem cake mixed (NH),SO, application at different levels to rice Var. IR 20 revealed that the yield of rice grain and straw were significantly influenced by the various treatments. Among the treatments tried, 30 per cent neam cake mixed (NH):50, at 120 kg N/ha recorded. the highest grain and straw yield and the uptake of N and P. Irrespective of the levels of N. mixing of neem cake gave higher profit/ha compared to untreated (NH),SO.. Neem cake effectively regulated the nitrification rate thereby increased the conservation of NH-N in soil for longer period. The present investigation indicated that the nitrification inhibition property of neem cake extended well beyond 30 days after appli- cation of the same.
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