Residual effects of different soil organic amendments applied to aerobically grown rice (Oryza sativa) on succeeding wheat (Triticum aestivum) under basmati rice-wheat cropping system

A field experiment was conducted during 2012–14 at Jammu, Jammu and Kashmir, to determine the residual effects of different soil organic amendments, viz. control (recommended fertilizer dose); in-situ green manuring of prickly sesban or dhaincha (Sesbania cannabina Willd.) on N-basis; in-situ green manuring of dhaincha followed by application of vermicompost on N-basis (1: 1); in-situ green manuring of dhaincha followed by application of vermicompost and mulching with dhaincha on N-basis (1: 1: 1); in-situ green manuring of dhaincha followed by application of farmyard manure (FYM) on N-basis (1: 1); and in-situ green manuring of dhaincha followed by application of FYM and mulching with dhaincha on N-basis (1: 1: 1) on productivity, nutrient uptake and economics of basmati rice (Oryza sativa L.)-wheat (Triticum aestivum L.) cropping rotation. Significant residual effects of different soil organic amendments, viz. in-situ green manuring of dhaincha followed by application of vermicompost and mulching with dhaincha on N-basis (1: 1: 1) and in-situ green manuring of dhaincha followed by application of FYM and mulching with dhaincha on N-basis (1: 1: 1) were observed on succeeding wheat in comparison to the control and rest of the treatments. With residual effect of in-situ green manuring of dhaincha followed by application of vermicompost and mulching with dhaincha on N-basis (1: 1: 1); and in-situ green manuring of dhaincha followed by application of farmyard manure (FYM) on N-basis (1: 1); grain yield of succeeding wheat was 15.36% and 14.90%, respectively, higher than the control. The highest N: P: K uptake in wheat grain and straw were recorded with residual effect of in-situ green manuring of dhaincha followed by application of vermicompost and mulching with dhaincha on N-basis (1: 1: 1) and in-situ green manuring of dhaincha followed by application of FYM and mulching with dhaincha on N-basis (1: 1: 1); which in turn were significantly superior to the other treatments. The highest net returns of 44, 092/ha and net returns/rupee invested 2.22 were obtained with residual effect of in-situ green manuring of dhaincha followed by application of vermicompost and mulching with dhaincha on N-basis (1: 1: 1)