Dept. of Soil Science, G.B.Pant University of Agricultural Science and Technology, Pantnagar, Distt. Udham Singh Nagar (U.P.).
Present addresses:1 Dept. of Agricultural Chemistry, Gochar Maha Vidhyalaya Rampur Manihann, Saharanpur.
Distribution of different forms of sulphur and carbon-nitrogen-sulphur relationships were studied in soil profiles collected from twelve well established soil series belonging to Alfisols, Inceptisols and Mollisols, respectively. The ranges of different forms of sulphur in Alfisols, Inceptisols and Mollisols were, total-S: 150 to 833; 62 to 791; 125 to 833 mg kg−1 organic-S: 90 to 585; 35 to 530; 85 to 590 mg kg−1, sodium dihydrogen phosphate extractable-S: 11.6 to 55.0, 6.6 to 65.0; 6.6 to 55.0 mg kg−1 and calcium chloride extractable-S: 10.1 to 47.5; 3.7 to 56.2; 3.7 to 47.5 mg kg−1. Soil pH had negative correlation with total-S and organic -S (r = -0.323 & r = -0.311, significant at P=0.01), but organic carbon and total nitrogen showed significant and positive correlation with all forms of soil sulphur. The observed correlations were positive among all forms of sulphur. The respective mean C:N, C:S, N:S and C:N:S ratios were 13.7:1, 15.6:1, 12.2:1 and 100:7.9:7.9 for Alfisols, 11.7:1, 15.7:1; 1.4:1 and 100:8.5:6.5 for Inceptisols and 12.0:1, 13.0:1, 1.0: 1.0 and 100:8.7:9.2 for Mollisols.
Sulphur fractions, extractable sulphur, C:N:S ratios, soil properiies, Alfisols, Inceptisols and Mollisols
