Integrated nutrient management in lowland rice (Oryza sativa)

A field experiment was conducted during the wet seasons of 1992 and 1993 to study the effect of full and partial substitution of fertilizer N with green-manure N (Sesbania rostrata) on yield attributes and yield of rice (Oryza sativa L.) Conjuctive use of N at 200 and 222 kg N/ha and fertilizer N at 200 kg increased the yield attributes (number of panicles/unit area, weight/panicle of total and filled grains panicle and test weight). At 200 kg Nma, full substitution of fertilizer N with green-manure reduced the grain yield but the partial substitution of green-manure recorded almost similar or comparable yield with fertilizer N. Considering the productivity, application of 200 kg N/ha be suggested to medium-during rice and this dose may be applied in equal proportions of fertilizer and green-manure N.