STUDIES ON NITROGEN ECONOMY AND PRODUCTIVITY OF WHEAT AS AFFECTED BY RAINY-SEASON LEGUMES UNDER IRRIGATED CONDITIONS

A field experiment was conducted during July 1986-April 1988 at New De lhi, to evaluate the relative contribution of rainy-season legumes tow ards the growth and productivity of succeeding wheat (Triticum aestivu m [L.] emend. Fiori & Paol), find out economic optimum dose of nitroge n for succeeding wheat and screen a legume which can be best knitted i n wheat based cropping system. HD 2329 wheat performed better when gro wn after legumes than when grown after Local fodder sorghum (Sorghum b icolor [L.] Moench). N economy in wheat was greater (65-78 kg/ha) afte r Sona clusterbean (Cyamopsis tetragonoloba [L.] Taubert) and T-9 blac kgram (Phaseolus mungo L.) over sorghum. The economic optimum dose of N for wheat following pigeonpea (Cajanus cajan [L.] Millsp.), soybean (Glycine max [L.] Merr.), groundnut (Arachis hypogaea L.), blackgram ( Pbaseolus mungo L.) and clusterbean were 110.1, 103.6, 113.7, 109.6 an d 92.3 kg/ha respectively.