Enzymatic activities in a vertisol as influenced by long term nutrient management practices in soybean-wheat cropping system

Abstract

The present investigation entitled “Enzymatic Activities in a Vertisol as Influenced by Long Term Nutrient Management Practices in Soybean-Wheat Cropping System” was conducted during 2021-22 under All India Coordinated Research Project on Long-Term Fertilizer Experiment at the Research Farm of Jawaharlal Nehru Krishi Vishwa Vidyalaya, Jabalpur, Madhya Pradesh, India. The aim of the study was to evaluate the impact of inorganic fertilizers and organic manure on enzymatic activities (acid & alkaline phosphatase) in a Vertisol under soybean-wheat cropping system. The present study was performed with eight treatments, viz 50% NPK, 100% NPK, 150% NPK, 100% NP, 100% N, 100% NPK+FYM, 100% NPK(-S) and Control, which is comprising with four replications in a randomized block design. The findings of the present investigation indicated that the treatments including 100% NPK and 150% NPK significantly raised the activities of acid and alkaline phosphatase as compared to treatments containing 100% N alone and control. The 100% NPK+FYM treatment showed the highest value of both acid and alkaline phosphatase activity, whereas the control plot found the lowest values. Further, findings revealed that the all the enzymatic activities were decreased with increasing soil depth at all the treatments. Therefore, the balanced application of inorganic fertilizers either alone or in combination with organic manure is required to enhance and sustain the soil fertility status of a Vertisol.