SUMAN, S.N.HYNDAVI, S D R VAJRA2024-09-262024-09-262023M/SS/181/2021-2023https://krishikosh.egranth.ac.in/handle/1/5810215017A long-term field experiment was being conducted at Nursery Jhilli, Pusa Farm, RPCAU since kharif 2013. This experiment used a split-plot design in Calciorthent soil. The main plot treatments for rice crop included the application of various fertilization treatments based on Soil Test Crop Response Fertilizer Equations (T1 - Control plot, T2 - Farmers Practice, T3 - GRD, T4-the targeted yield of 3.5 t/ha (Y1) without IPNS (Integrated Plant Nutrient System) , T5 –the targeted yield of 4.0 t/ha (Y2) without IPNS, T6 - the targeted yield of 4.5 t/ha (Y3) without IPNS, T7 -the targeted yield of 3.5 t/ha (Y1) with IPNS @ compost 5 t ha-1, T8 - the targeted yield of 4.0 t/ha (Y2) with IPNS @ compost 5 t ha-1, and T9 - the targeted yield of 4.5 t/ha (Y3) with IPNS @ compost 5 t ha-1 and several cropping systems as subplot treatments (Rice-wheat, Rice-Mustard, Rice-Winter Maize) under rice-based cropping systems. Rice variety Rajendra bhagwati was transplanted during the kharif 2022. Post-harvest soil samples were examined for distribution of available sulphur at 3 distinct depths (0-15 cm, 15-30 cm, and 30-45 cm) within the soil in addition to yield, yield-attributing characteristics, and nutrients uptake by rice crop. Collected post-harvest soil samples were fractioned to obtain different S pools in surface soil. Both grain yield (t/ha) and straw yield (t/ha) of rice increased significantly in treatments having IPNS @ compost 5 t ha-1. However, it was found that yield at T9 – the targeted yield of 4.5 t/ha (Y3) with IPNS @ compost 5 t ha-1 was at par with T8- the targeted yield of 4.0 t/ha (Y3) with IPNS @ compost 5 t ha-1. The yield under different nutrients supply options were recorded in the order 2.02 t/ha to 4.43 t/ha. The result indicated that RDF as well as farmers practices could be substituted with treatments having T9 -the targeted yield of 4.5 t/ha (Y3) with IPNS @ compost 5 t ha-1. The combined application of organic matter and fertilizers with different yield target resulted in a build-up of available sulphur in the soil. It was found that the available Sulphur concentration (ppm) rose up to a depth of 45 cm in the soil. Through sequential fractionation, it was also recorded that all the sulphur fractions—distilled water-soluble S, sulphate S, inorganically bound S, organically bound S, residual S, and total S—remained in dynamic equilibrium in soil. Organically bound S contributed the most to total S.EnglishThesis