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This article in SSSAJ

  1. Vol. 43 No. 1, p. 135-138
    Received: Oct 13, 1977
    Accepted: Oct 19, 1978

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Studies in Soil Manganese: I. Factors Affecting Manganese Extractability1

  1. I. H. Salcedo and
  2. D. D. Warncke2



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.

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