Effect of coating Urea granules with Neem (Azadirachta indica) – Urea coat on the pattern of nitrogen release and microbial activity

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Influence of Neem Coated Urea on the release of NH4-N; NO2 + NO3-N, microbial activity and relative nitrification rate was determined in a laboratory incubation experiment. Five treatments, viz., soil + urea (T1), soil + urea coated with Neem coat-I (T2), soil + urea coated with urea coat-I & urea coat-II (T3), soil + urea coat-II (T4) and soil alone (T5). The ammonical and nitrate nitrogen release pattern in all the treatments was alike. Similar was the production of CO2 reflecting microbial activity. Relative rate of nitrification in treatment soil + urea coat-I (T2) was significantly less than even the soil alone treatment, i.e., control.