Patil, J.D.Chetna Gada2018-08-282018-08-282001http://krishikosh.egranth.ac.in/handle/1/5810069903A field experiment was conducted during kharif 2000-2001 at PGI farm, M.P.K.V., Rahuri, Dist. Ahmednagar. The experiment was laid out in Factorial Randomised Block Design, with three replications. There were sixteen treatments viz., four sources of sulphur and four levels of sulphur (0, 20, 30 and 40 kg S ha1). The nitrogen, phosphorus and potassium was applied as a basal dose as per the yield targeting equation to sunflower crop. Various forms of sulphur were estimated initially and after harvest of the crop. An incubation study was also carried out in the laboratory at ambient conditions. The results revealed that the gypsum application was beneficial for soil available sulphur whereas, the sulfer-95 application increased the non-sulphate sulphur in soil. Highest level (40 kg S ha1) significantly increased the total sulphur, organic sulphur and available sulphur. Oxidation behaviour of sulphur was studied by incubating different sources of sulphur at different levels in soil at field capacity for 60 days. The results showed that elemental sulphur application viz., elemental sulphur and sulfer-95 showed slower rate of sulphur oxidation than gypsum and single super phosphate. Sunflower crop showed spectacular response to application of sulphur. Higher levels of sulphur application were beneficial for enhancing the concentration of nitrogen, phosphorus and sulphur in sunflower. The application of single super phosphate or gypsum were equally important for uptake of nitrogen, phosphorus, potassium and sulphur by sunflower crop. The gypsum source of sulphur application was significantly beneficial for oil per cent of sunflower. The oil content of sunflower was increased with sulphur application @ 30 kg ha1 or 40 j kg ha1.ennullThesis