Agronomic evaluation of system of rice intensification methods in Godavari delta

Field experiments were conducted during the wet seasons of 2003–2005 to evaluate the performance of system of rice intensification with various aspects of nutrient management, soil water regime, varieties, and weed growth. Combined application of farm yard manure (FYM) at 5 tha-1 along with half the recommended nitrogen through chemical and gypsum at 1 t ha-1 registered highest yield (7.6 tha-1). Maximum grain yield (7.2 tha-1), root mass and root volume was recorded with Swarna in SRI method. All varieties exhibited their superior yields in SRI system. The highest grain yield and maximum water use efficiency (8.19 kg mm-1 ha-1) were registered under continuous submergence. The water requirement under saturation treatment was 40% lesser than continuous flooding at 5cm depth.