_____________________________________________________________________________________________________ *Corresponding author: E-mail: devendrainwati@gmail.com; Journal of Experimental Agriculture International 44(10): 179-184, 2022; Article no.JEAI.90860 ISSN: 2457-0591 (Past name: American Journal of Experimental Agriculture, Past ISSN: 2231-0606) Effect of Long Term Fertilizer and FYM Application on Soil Fertility of a Vertisol under Soybean-wheat Cropping System Devendra Kumar Inwati a* , B. K. Dixit a , Risikesh Thakur b , B. S. Dwivedi a , Abhishek Sharma a and Vivek Singh a a Department of Soil Science, College of Agriculture, Jawaharlal Nehru Krishi Vishwa Vidyalaya, Jabalpur, Madhya Pradesh– 482 004, India. b Jawaharlal Nehru Krishi Vishwavidyalaya, College of Agriculture, Balaghat, Madhya Pradesh, India. Authors’ contributions This work was carried out in collaboration among all authors. All authors read and approved the final manuscript. Article Information DOI: 10.9734/JEAI/2022/v44i1030891 Open Peer Review History: This journal follows the Advanced Open Peer Review policy. Identity of the Reviewers, Editor(s) and additional Reviewers, peer review comments, different versions of the manuscript, comments of the editors, etc are available here: https://www.sdiarticle5.com/review-history/90860 Received 03 July 2022 Accepted 17 August 2022 Published 17 August 2022 ABSTRACT The present studies were conducted under All India Coordinated Research Project on Long Term Fertilizer Experiment, which was commenced since, 1972. To assess the effect of 48 years (1972- 73 to 2019-20) continuous application of inorganic fertilizers with or without organic manure i.e. FYM on soil fertility status of Vertisols under soybean-wheat cropping system. The results of the present study showed that the application of recommended dose of N, P and K (20:80:20 kg ha -1 to soybean and 120:80:40 kg ha -1 to wheat) with organic manure @ 5 t FYM ha -1 improved the status of available N, P and S but decline in available K. Further, the integrated use of fertilizers with organic manure enhanced the soil organic carbon contents (9.5 g kg -1 ) from its initial value (5.7 g ka -1 ). Conjoint use of FYM with 100% NPK substantially improved contribution towards sustaining the soil fertility. A declining trend (228 to 335 kg ha -1 ) from its initial value (370.0 kg ha -1 ) of available K status was also observed as a result of continuous application of fertilizer and manure; this indicates considerable mining of available K from the soil. However, the decline of K was of lower magnitude with 100% NPK + FYM and 150% NPK treatments indicating the need to raise the dose of K fertilizer application to meet the demand of crops. Further, soil available nutrients to be Original Research Article