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Soybean Yield, Leaf Manganese, and Soil Manganese as Affected by Sources and Rates of Manganese and Soil pH¹

Manganese deficiencies in soybeans [Gycine max (L.) Merr.] grown on certain southern Coastal Plain soils of southeastern USA have required that supplemental Mn be applied to obtain maximum yields. The objective of this experiment was to determine sources and rates of Mn needed for optimum yields at two soil pH levels. Soybeans (‘Ransom’) were grown for three years on an Olustee-Leefield sand (Ultic Haplaquod-Arenic Plinthaquic Paleudult) with Mn sulfate, manganous oxide, and fritted Mn as sources at 0, 5.6, 11.2, and 22.4 kg/ha rates. Chelated Mn as MnEDTA was used at one-tenth the rate of the others. Treatments were evaluated by leaf and soil analysis and grain yields.

The Mn sulfate, manganous oxide, and fritted Mn were all satisfactory sources and produced relatively high yields. The Mn chelate did not increak yields above the check, except at the highest rate the final year at the higher pH level. Leaf and soil Mn were increased by the sources in the following order: Mn sulfate > Mn oxide > Mn frit > Mn chelate. The rate of Mn from the Mn sulfate and manganous oxide sources that produced optimum yields was 11.2 kg Mn/ha in the final year where soil pH values were 6.9 and Mn was severely deficient on check plots. The frit source may need higher rates to be equal to the other two source since increased yields were observed at the 22.4 kg %/ha rate for frit.

Key Words: Glycine max (L.) Merr. • Mn sulfate • Mn oxide • Mn EDTA • Mn Frit.

² Associate professor, professors, and associate professor of Agronomy, respectively, Univ. of Georgia, Georgia Stn., Experiment, GA 30212.

³ Assistant professor of Agronomy, Univ. of Georgia, Coastal Plain Stn., Tifton. GA 31794.

Received for publication March 16, 1979.