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Sulfur Fractions and Carbon, Nitrogen, and Sulfur Relationships in Grassland, Forest, and Associated Transitional Soils¹

ABSTRACT

The amounts of total S, organic N, organic C, and HI-reducible-S obtained from Ap layers of 54 soils collected from five major soil zones in Saskatchewan varied considerably with location within any one zone. However, the mean C/S, N/S ratios and the percentage of total S as HI-reducible S of the soil organic matter showed similar and consistent trends. The C/N/S ratios ranged from 58:6.4:1 in the arid Chernozemic Brown soils to 129:10.6:1 in the leached Grey Wooded soils. The percentage of total S as HI-reducible was approximately 50% in the Chernozemic soils in contrast to 36% in the Grey Wooded soils.

¹ Contribution from the Saskatchewan Inst. of Pedology no. R118. This work has been supported by grants from the Sulphur Inst. and National Research Council of Canada (A4474).

² Assistant and Associate Professors, Dep. of Soil Science, Univ. of Saskatchewan, Saskatoon, Canada, respectively.

Received for publication June 4, 1973. Accepted for publication July 18, 1973.