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Manganese-Sulfur Fusions as a Source of Manganese for Crops¹

A greenhouse experiment was conducted to study the availability ot manganese to ryegrass (Lolium perenne L.) from manganese-sulfur fusions. Total yields of eight successive cuttings were not appreciably affected by the various manganese treatments, but the concentration of manganese in the tissue was directly related to the solubility of the compounds used and inversely related to granule size and soil pH. The 20 to 40 and the 40 to 80 mesh fusions of MnCO₃ with sulfur (1:2) gave ample and fairly steady supply of manganese for the eight cuttings. The coarser granule sizes were less effective. The total manganese content of the cuttings was about two to five times higher for the MnCO₃-S fusions than for comparable MnO₂-S fusions. It was also about two to four times higher at a soil pH of 6.0 than at 7.2. Total crop recovery of applied elemental sulfur and soil sulfate was inversely related to granule size and ranged from 22 to 112%.

Key Words: ryegrass • yield • manganese uptake • granule size • soil pH

² Research Assistant, Research Assistant, and Professor of Soils, respectively, University of Wisconsin, 53706.

Received for publication September 8, 1967.