LONG TERM APPLICATION OF FERTILIZER AND MANURES ON PHYSICO-CHEMICAL PROPERTIES AND N, P AND K UPTAKE IN SOYBEAN-WHEAT CROPPING SYSTEM

Field experiments was conducted under All India Co-ordinated Research Project on “Long term Fertilizer Experiment” since 1972, but the present work was conducted during 2009 with soybean-wheat cropping sequence at the Research Farm of Department of Soil Science and Agricultural Chemistry, J.N. Krishi Vishwa Vidyalaya, Jabalpur (M.P.), India to study the response of long term application of fertilizer and manures on physico-chemical properties and N, P and K uptake in soybeanwheat cropping system. The treatment were applied in eight treatment combinations comprising of different doses of fertilizers viz., 50, 100 and 150% NPK, 100% NP, 100% N, 100% NPK + FYM, 100% NPK-S and control. The results revealed that the application of 100% NPK and FYM has significantly increased the status of pH (7.70), organic carbon (8.58 g kg -1 ) and calcium carbonate (60.00 g kg -1 ). Further, the available N, P and K were markedly increased by the application of 100% NPK along with FYM as compared to NPK alone. Thus, the present studies indicated that the application of 100% NPK with FYM in soybean-wheat cropping system enhanced the physico-chemical properties and nutrient availability at the depth of 0-20 cm in soil.