Assessment of chemical properties of a Vertisol under long-term fertilizer experiment in soybean-wheat cropping system

Field experiments was conducted under All India Co-ordinate Research Project on “Long term Fertilizer Experiment” since 1972, but the present work was conducted during 2015-16 with soybean-wheat cropping sequence at the Research Farm Department of Soil Science and Agricultural Chemistry, J.N. Krishi Vishwa Vidyalaya, Jabalpur (M.P.), India to the assessment of chemical properties of a Vertisol under long -term fertilizer experiment in soybean-wheat cropping system. Eight treatments were imposed with four replications in simple randomized block design in both soybean and wheat crops. The treatments were T1 (Control), T2 (50% NPK), T3 (100% NPK), T4 (150% NPK), T5 (100% NP), T6 (100% N), T7 (100% NPK+FYM), T8 (100% NPK-S). The results obtained from the present investigation clearly indicated that chemical properties changes in pH and EC in surface and sub-surface soils under different treatments were statistically non-significant. However, the treatments of long-term application of balanced nutrients with and without FYM have significant effect on organic carbon content, cation exchange capacity and calcium carbonate in surface and sub-surface soils under soybean-wheat cropping system.