Indian Journal of Agronomy

Field experiments were conducted during kharif and rabi for 2 consecutive years (2002–03 and 2003–04) at Hisar to evaluate the direct and residual effect of organic manures and phosphorus on productivity, nutrient uptake, soil fertility and economics of greengram-wheat cropping system. Three levels of organic manures (no organic manure, FYM 5 tonne/ha and vermicompost 5 tonne/ha) and 3 phosphorus levels (control, 9 and 18 kg P/ha) applied to only greengram and 3 recommended dose of fertilizers viz., 50%, 75% and 100% applied to only wheat. Application of FYM and vermicompost to greengram increased grain yield and net returns of greengram on an average by 30.5% and 3,653 Rs/ha, respectively, over no manures. Application of 18 kg P/ha to greengram significantly increased grain yield of 264 and 98 kg/ha over control and 9 kg P/ha, respectively. Residual effect of both FYM and vermicompost on yield attributes and yield of wheat was significant over no organic manure, which produced grain yield of 4.13 and 4.15 tonne/ha and gave net return of 20,716 and 20,982 Rs/ha, respectively. The residual effect of 18 kg P/ha applied to greengram was significant on grain yield (4.17 tonne/ha) of wheat over control (3.82 tonne/ha) and 9 kg P/ha (4.02 tonne/ha). The available N and P in soil after greengram harvest, increased significantly over no organic manure application of FYM and vermicompost in greengram. NP uptake by greengram as well as succeeding wheat crop increased significantly with 9 kg P/ha over control. Application of 75% RDF (113, 20 and 40 kg/ha N, P and K) to wheat grown on residual fertility of manures and P applied to greengram, gave significantly higher productivity and net return of wheat as well as in greengram-wheat cropping system.