Different Forms of Sulphur and their Relationship with Properties of Entisols of Jaipur District (Rajasthan) under Mustard Cultivation

The total S content in mustard growing soils of Jaipur district ranged from 101.30 to 302.40 mgkg⁻¹ with a mean value of 154.28 mgkg⁻¹. The mean values of organic-S, S0₄-S and non-sulphate-S were 36.39, 14.52 and 102.12 mg kg⁻¹, respectively. All the forms of sulphur gave significant positive correlation with organic carbon indicating sulphur as the integral part of soil organic matter. Correlation studies between silt, clay and forms of sulphur indicate that appreciable quantity of sulphur was adsorbed on finer fractions of soils. Significant negative correlation was observed with sand but had non-significant correlation with pH of soils except S0₄-S, The step-down multiple regression equations revealed that organic carbon had greater impact on different forms of sulphur followed by soil texture. Approximately, 33.75% investigated soils were deficient in available sulphur.