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Studies in Soil Manganese: I. Factors Affecting Manganese Extractability¹

ABSTRACT

Effects of 12 solution/soil ratio-shaking time combinations upon Mn extracted by 0.1N HCl, 0.1N H₃PO₄, 0.005M DTPA, and 1N NH₄OAc from 12 Michigan and Indiana soils were studied. A solution/soil ratio of 25 with 120 min of shaking maximized extractable Mn by the four extractants. However, with 0.005M DTPA and 1N NH₄OAc shaking time and solution/soil ratio had little effect on extractable Mn. When results were correlated with Mn uptake by soybeans [Glycine max (L.) merr.], the best correlation was obtained with a solution/soil ratio of 5 and 120 min of shaking for 0.1N HCl and 0.1N H₃PO₄. Correlation of plant Mn uptake with DTPA- and NH₄OAc-extractable Mn was relatively independent of solution/soil ratio-shaking time combinations used.

¹ Authorized for publication by the Director as Journal Article no. 8286 of the Michigan Agric. Exp. Stn., East Lansing, 48824.

² Former Graduate Assistant and Assistant Professor of Soil Science, respectively. The senior author gratefuly acknowledges financial support of the University of Buenos Aires, Argentina.

Received for publication October 13, 1977. Accepted for publication October 19, 1978.