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Sources of Sulfur for Crop Plants in Michigan and Effect of Sulfur Fertilization on Plant Growth and Composition¹

Synopsis: Crop yields or the protein content of the crops were not increased by sulfur amendments. Potatoes and red clover showed increased sulfur contents from additions of sulfur in the fertilizer when grown on an infertile sandy soil in Northern Michigan. This increased sulfur in the potatoes existed mainly in the sulfate form. The amount of sulfur in the precipitation average 10.1 pounds per acre annually. The amount of sulfur dioxide in the atmosphere was more pronounced in industrial areas of the state.

² Formerly, Graduate Research Assistant (now, Agronomist, Canada Department of Agriculture), and Professor of Soil Science, Michigan State University. The financial support of the American Agricultural Chemical Company in this work is acknowledged.

Received for publication October 6, 1961.