Field experiments were conducted during kharif and rabi seasons of 1991-92 to study the influence of nitrogen sources on the efficiency and yield of rice in Typic Ustropept wetland soil. The results revealed that the yield, nitrogen, phosphorus and potassium uptake, response ratio, apparent nitrogen recovery, output efficiency and benefit cost ratio were higher under the use of neem cake coated urea and urea gypsum than the conventionally applied prilled urea on equal nitrogen basis of 125 kg N/ha. The combined application of prilled urea at 75 kg N/ha with green leaf manure at 50 kg N/ha proved to be the next best. Application of nitrogen at 175 kg N/ha was found to be necessary for getting higher grain yield in rice during both the crop seasons when the ordinary prilled urea was used.
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