A field experiment was conducted during 2002–03 to 2003–04 at Pantnagar, to study the direct and residual effects of organic and inorganic sources of nutrients under urdbean [Vigna mungo (L.) Hepper]–wheat (Triticum aestivum L. emend. Fiori & Paol.) cropping sequence. Plant height in urdbean varied significantly with the application of farmyard manure @ 5 tonnes/ha and phosphorus @ 40 kg P2O5/ha over their respective control. Farmyard manure @ 5 tonnes/ha also resulted in significantly higher number of pods/plant, grain and biological yields than no-farmyard manure application. However 20 and 40 kg P2O5/ha,being at par, recorded significantly higher grain yield than the control. Yield attributes, yield and harvest index in wheat were not influenced by improved because the residual effect of farmyard manure and phosphorus applied to urdbean, whereas 75 and 100% of recommended level, being at par, resulted in significantly higher values of yield attributes and yield compared to 50% of recommended level. On economic point of view, 75% of recommended fertilizer level resulted in the highest net return and also gave at par wheat-grain-equivalent yield to 100% of recommended level. Total nutrient uptake of the system and soil-nutrient status after urdbean–wheat sequence also increased significantly because of the direct and residual sources of nurients.
Direct effect, Net returns, Nutrient status, Residual effect, Urdbean, Wheat
