Dynamics of Nitrogen Forms in the Leachate in Relation to Yield of and Nitrogen Uptake by Rice

The N forms in the leachate due to the application of different sources of N for rice are variable. Major portion of N in the leachate were in the form of NH₄-N, followed by NH₂-N and the lowest in the form of NO₃-N in both the seasons. The content of NH₂-N in the leachate could be detected only upto a week from the day of fertilizer application. The lowest contents of NH₄-N and NO₃-N in the leachate were observed with the application of neem cake coated urea followed by urea gypsum. Application of ammonium chloride recorded the lowest NH₂-N content in the leachate which was followed by neem cake, coated urea and urea gypsum. Neem cake coated urea and urea gypsum recorded the lowest content of NH₄-N and NO₃-N in the leachate and produced maximum yield of rice grain during both the crop seasons.