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Studies in Soil Manganese: II.: Extractable Manganese and Plant Uptake¹

ABSTRACT

Results from a greenhouse pot experiment with 12 Michigan and Indiana soils of different characteristics were used to evaluate effectiveness of six extractants in predicting Mn uptake by soybean (Glycine max., cv. Hark) plants. Three levels of Mn as MnSO₄ were added to each soil. Correlation between extractable Mn and uptake of Mn by plants decreased in the following order: 0.1N H₃PO₄ > steam/1N NH₄OAc > 1.5M NH₄H₂PO₄ > 0.1N HCl > 1N NH₄OAc > 0.005M DTPA. Inclusion of pH and (Ca+Mg)/K ratio in prediction equations for each soil test increased percentages of variation in uptake data explained by the tests. Of the soil characteristics, Mn oxide fractions explained 66% of the variation in Mn uptake; inclusion of pH, bases ratio and total Mn in the equation accounted for 82% of this variation. Critical levels of extractable Mn in these soils were 12 ppm for 0.1N H₃PO₄ and 14 ppm for steam/1N NH₄OAc or 1.5M NH₄H₂PO₄.

¹ Authorized for publication by the Director as Journal Article no. 8287 of the Michigan State Agric. Exp. Sta., East Lansing 48824.

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

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