Int.J.Curr.Microbiol.App.Sci (2018) 7(3): 152-158 152 Original Research Article https://doi.org/10.20546/ijcmas.2018.703.018 Interaction Effect of Phosphorus and Sulphur on Yield and Quality of Soybean in a Vertisol Jarupula Suman*, B.S. Dwivedi, A.K. Dwivedi and S.K. Pandey College of Agriculture, JNKVV, Jabalpur-482 004 (MP), India *Corresponding author ABSTRACT Introduction Soybean is a well-known oilseed as well as pulses crop which is grown in various countries. Soybean, besides having excellent nutritional quality, contributes the highest to world oil production. Through, there has been a prodigious increase in the acreage (1.5 to 6.3 m ha) as well as production (1.0 to 6.1 mt) of soybean during last one and half decade, even then. The share of India in world soybean production is significantly (nearly 3.8%) attributed to low productivity (SOPA, 2015). Phosphorus, an important constituent of biochemical products in plant itself plays a key role in balance nutrition of the crop and affects productivity of soybean. Next most important emerging nutrient that is showing wide spread deficiency is sulphur. Sulphur is essential for synthesis of proteins, vitamins and sulphur containing essential amino acids and is also associated with nitrogen metabolism. The good yield of soybean can be achieved by balanced and adequate supply of phosphate, sulphur and other deficient, nutrients. Sulphur interacts with phosphorus as phosphate ion is more strongly bound than sulphate (Choudhary and Das, 1996; Aulakh et al., 1990). Phosphorus fertilizer application results increased of anion adsorption sites by phosphate, which releases sulphate ions into the soil solution (Chandra Deo and Khaldelwal, 2009). Thus, it may be subjected International Journal of Current Microbiology and Applied Sciences ISSN: 2319-7706 Volume 7 Number 03 (2018) Journal homepage: http://www.ijcmas.com A field experiment was carried out to evaluate the effect of sulphur and phosphorus application on yield and N, P and K contents of soybean grown on Vertisol. It was found that increasing application of sulphur and phosphorus, singly as well as in combination, significantly increased the grain yield and contents of N, P and K over control. The interaction of S x P exhibited a strong synergistic relationship in soybean nutrition grown on deficient soil. Result indicated that grain and straw yield, uptake of phosphorus and sulphur increased with increase in the rate of application of P and S individually as well as in various combinations. Applied various levels of P and S also influenced the quality parameters of soybean i.e. protein content and oil content. Available P in soil increased with increasing levels of phosphorus. Similarly available S in the soil increased with increasing levels of sulphur. Keywords Synergistic relationship, Protein and oil content Accepted: 04 February 2018 Available Online: 10 March 2018 Article Info