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Alteration of Sulfur-34 Natural Abundance in Soil by Application of Feedlot Manure¹

ABSTRACT

The ³⁴S/³²S abundance ratios (³⁴S) of four forms of S present in cattle feedlot manure and at various depths in profiles of a soil receiving different rates of manure were determined. Whereas the ³⁴S values for all S forms in manure were similar (–2.8–3.6) they differed markedly among different forms of soil S (+1.6 for Raney Nireducible S to +6.2 for HI-reducible S). Effects of manure applications on the isotopic composition of S were observed for most S forms only at the soil surface or in shallower horizons. In contrast, the ³⁴S values and concentrations of C-bonded S indicated penetration of manure S down to or near the water table, particularly in the profile which had received a high rate of manure application. The NO^-_3--N distribution in the soil profiles showed that manure NO^-_3--N had also moved down below the water table. Therefore, it is concluded that C-bonded S is the best form for tracing the down-ward movement in soils of S-bearing compounds in manure.

¹ Contribution from Environmental Protection Services, Alberta Environment, 14th Floor, Standard Life Centre, 10405 Jasper Ave., Edmonton, Alberta, Canada T5J 3N4.

² Laboratory Scientist, Alberta Environment and Professor, respectively. Dep. of Physics, Univ. of Calgary, Calgary, Alberta T2N 1N4.

Received for publication July 1, 1985.