Alteration of Sulfur-34 Natural Abundance in Soil by Application of Feedlot Manure1
- Yeh Moon Chae and
- H. Roy Krouse2
The 34S/32S abundance ratios (δ34S) 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 δ34S 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 δ34S 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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