SUBSTITUTION OF INORGANIC NITROGEN THROUGH LOCAL GREEN-LEAF MANURE AND AZOSPIRILLUM IN RICE (ORYZA-SATIVUM)

Application of 50% of nitrogen as inorganic fertilizer + 25% oi N thro ugh prickly sesban or dhaincha [Sesbania cannabina (Retz.) Pers.] + Az ospirillum as seed and soil application recorded higher grain yield of 58.7 q/ha with the highest benefit : cost ratio of 4.52 : 1. It was f oIlowed by 75% of N as inorganic source + 25% of N through prickly ses ban. Application of green-manure alone and iu combination with azospir illum can substitute 25 and 50% of N respectively. Incorporation of wa steland weeds such as Cassia nigricans and Ipomoea carnea Jacq. also h elp to substitute inorganic nitrogen by 25% without any reduction in y ield.