Effect of Integrated Application of Organic and Inorganic Sources Phosphorus on Soil Properties, Yield and Nutrient Uptake by Pigeonpea in Dryland Condition

摘要

A field experiment was conducted for five consecutive kharif seasons (2010-11 to 2014-15) on Inceptisol at Zonal Agricultural Research Station farm Solapur to study the effect of integrated phosphorus application through inorganic and organic sourceson soil properties, yield and nutrient uptake by pigeonpea under dryland conditions in scarcity zone of Maharashtra. Five year conjoint use of 50 recommended dose of phosphorus through PMC (25 kg/ha) + 50 recommended dose of phosphorus through chemical fertilizer (25 kg/ha) along with 25 kg N/ha through urea and seed treatment with each rhizobium and phosphate solubalizing bacteria (PSB) @ 25g/kg seed significantly improved the organic carbon and soil available N, P and K content over chemical fertilizers alone. Significantly higher yield (grain 9.07 q/ha and straw 49.89 q/ha) and total N PK uptake by pigeonpea (72.27, 12.00 and 75.53 kg/ha, respectively) with the application of 50 recommended dose of phosphorus through PMC + 50 recommended dose of phosphorus through chemical fertilizer treatment. The highest monetary returns (41737/ha), net returns (16649/ha) and B:C ratio of 1.62 were recorded in the same treatment. Thus, integrated application of inorganic and organic sources of phosphorus maximized yields of pigeonpea crop and improved the soil fertility in Inceptisol under dryland conditions in scarcity zone of Maharashtra.