Grain Yield and Mineral N Content in Soil as Influenced by Water Regimes, Levels of N and Methods of N Application

The grain yield and mineral N content in soil as influenced by water regimes, levels of N and methods of N application were studied in field experiments during 1969 and 1970 at the Indian Agricultural Research Institute, New Delhi. Grain yield and mineral N content in soil were more under continuous submergence as compared to alternate wetting and drying. The rice variety Padma responded in yield up to 150 kg N/ha. Of the methods of N application, 75% soil + 25% foliar produced more yield over soil alone or 50% soil + 50% foliar under both the water management systems. The mineral N content in soil increased with the increasing levels of N up to 200 kg N/ha.