Optimization of Phosphorus requirement of potato (Solanum tuberosum L.) through organic and inorganic sources under current scenario of P use

Abstract

A field experiment was conducted during 2015-16 at ICAR- CPRS, Gwalior M.P. during Rabi season, to determine the optimum phosphorus dose of potato (Solanum tuberosum L.) through organic and inorganic sources under current scenario of P use. The experiment consisted of 10 treatments with four replications. The results revealed that both farmers practice and application of 120 Kg P2O5/ha through fertilizer produced significantly higher fresh biomass (g/plant), fresh weight of tuber(g/plant), dry weight of tuber(g/plant), NPK content in soil (kg/ha), NPK % in both tuber and haulm, yield (tuber, haulm and biological) and both these treatments were statistically at par to each other. On the other hand 100 % P2O5 through FYM recorded significantly higher number of leaves/plant. From the quadratic equation line (Y = 21.748 + 5.489 X – 0.587X2) for inorganic doses of P, 116.93 and 63.42 kg P2O5/ha were the optimum physical and economical levels, respectively for getting higher yield of tuber. Therefore, it is concluded that application of 120 and 60 Kg P2O5/ha through fertilizer was the best optimum dose of phosphorus for achieving higher optimum physical and economical productivity, respectively. Therefore, application of 60 Kg P2O5 through fertilizer is the optimum dose of phosphorus for central India.