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An Incubation study under laboratory condition were conducted during 2016 with a view to study “Influence of slow release nitrogenous fertilizers on soil nitrogen availability under Incubation study” The laboratory incubation experiment was conducted in completely randomized design with 11 treatments. The application of nitrogen through slow release fertilizers as CDU, NCU and SCU and their combination with urea and among the organic sources release the soil available nitrogen with advanced incubation period. It was decreased in treatment GRDF and RDN-CDU at 90 DAA. The release of ammonical nitrogen in all the treatments showed the similar trend to that of soil available nitrogen at all the period of incubation. The slow release nitrogen fertilizer treatment @ 50 % RDN-urea + 50 % RDN either through CDU, NCU or SCU were beneficial for release of nitrate nitrogen in soil.

Key words: slow release nitrogenous fertilizers, incubation, available N, Ammonical Nitrogen, Nitrate nitrogen.