Relationship of Carbon, Nitrogen, Phosphorus and Sulphur in Major Soils of Rajasthan and in Their Humus Fractions

In eight major soil associations of Rajasthan and their humus fractions, the organic C:N:P:S ratio showed much variations. As compared with other soils, the ratios were rather narrow and the soils appeared to contain higher proportion of phosphorus and sulphur in their organic component. The humic acid showed relatively lower content of sulphur and phosphorus but in fulvic acid and humin their proportions were comparable with that of the soil. Wide variability in the C:N:P:S ratios of soil and humus fractions suggests differential accumulation of sulphur and phosphorus containing organic compounds.