EFFECT OF DIFFERENT NUTRIENT MANAGEMENT AND CROPPING SYSTEM ON WEED INTENSITY, WEED BIOMASS, RICE EQUIVALENT YIELD AND PRODUCTION EFFICIENCY IN DIFFERENT RICE BASED CROPPING SYSTEMS

A field experiment was conducted during 2010-11 to 2012-13 at Jabalpur (Madhya Pradesh) to study the effect of nutrient management and cropping system on productivity and soil microbial growth under different rice based cropping systems in Madhya Pradesh. The 4 different cropping systems (CS 1 -Green manuring sunhemp-Rice-Wheat, CS 2 -Rice-Chickpea-Sesame, CS 3 -Rice-Berseem, CS 4 -Rice-Veg. pea-Sorghum) and three nutrient managements M 1 - 100% Organic (1/3 N through each of FYM, Vermicompost and Neem oil cake), M 2 -100% Inorganic (100% NPK through fertilizers), M 3 -INM (50% NPK through fertilizer + 50% N through organic sources) with 3 replications in Strip plot design. The soil of the experimental field was sandy clay loam in texture, neutral in reaction (7.3), normal EC (0.52), low in OC (0.72%), medium in available N (264.05kg/ha) and P(12.8 kg/ha) and high in K (285.2 kg/ha). The highest weed intensity of (352.6 m -2 ), weed biomass (1183 kg ha -1 ), rice equivalent yield (69.35 q ha -1 ) and production efficiency (22.07 kg ha -1 day -1 ) during kharif, rabi and summer season in 100%