Three field experiments were conducted during summer (February-May), kuruvai (July-October) and thaladi (November- February) seasons of 1985-'86 with different sources of N,viz., prilled urea, ammonium chloride, neem cake coated urea, coal tar coated urea, lac coated urea and urea supergranule, each with four levels, viz., 0, 51, 102 and 153 kgN/ha to study the use efficiency (NUE) and apparent recovery (ANR) of the applied N in wet land rice. The results indicated that the yield, uptake of N, the NUE and ANR in rice were higher under urea supergranule followed by lac coated urea than prilled urea in all the three crop seasons. Application of ammonium chloride also registered higher grain yield and NUE over prilled urea during thaladi season.
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