EFFECT OF NITROGEN AND ORGANIC MANURE ON RICE (ORYZA-SATIVA) YIELD AND RESIDUAL EFFECT ON WHEAT (TRITICUM-AESTIVUM) CROP

A field study was carried out during 1986-87 and 1987-88 to find out the effect of different levels of nitrogen and organic manure on yield of rice (Oryza sativa L.) and residual effect on wheat (Triticum aestivum L. emend. Fiori & Poal.) crop. Application of farmyard manure or wheat straw @ 10 tonnes/ha saved 50 kg N/ha and gave maximum yield of rice. The carry-over effect of farmyard manure on wheat also had the trend similar to rice. The beneit : cost ratio was maximum with farmyard manure @ 10 tonnes//ha + 100 kg N/ha treatment in wheat and farmyard manure alone in case of rice. But the treatments, 100 kg N, farmyard manure, farmyard monure + 50 kg N and farmyard manure + 100 kg N/ha had almost similar benefit : cost ratio.