Effect of Sulfur Content of Straws on Rates of Decomposition and Plant Growth1
- B. A. Stewart,
- L. K. Porter and
- F. G. Viets2
Sulfur deficiency must be considered in management of crop residues. With adequate N, P, and K, the decomposition rate of straw in soil low in sulfates depended on the S content of the straw. Incubation studies showed that unless S fertilizer is added, the S content of straw must exceed about 0.15% for a maximum rate of straw decomposition. Growth of winter wheat (Triticum aestivum L. ‘Wichita’), in the greenhouse, on a NPK-fertilized soil was governed by the S content of straw mixed in the soil. Straws with < 0.15% S added to soil depressed wheat growth, but straws with a higher S content increased yields compared to the no-straw treatment. When S was added along with N, P, and K, the S content of the straws had no effect on wheat growth.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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