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Relationship of Extractable Soil Manganese to Soil Properties¹

ABSTRACT

In a greenhouse experiment eight Southeastern soils were amended to give pH levels of 4.8, 5.8, and 6.8 and were treated with 0, 25, and 50 ppm Mn. After growing wheat (Triticum aestivium L.) for 40 days, the soils were extracted for Mn using six extractants: H₂O, neutral 1N NH₄OAc (with and without 0.2% hydroquinone), "double acid", diethylenetriaminepentaacetic acid (DTPA) and ethylenediaminedi-o-hydroxyphenylacetic acid (EDDHA). Except for the low-Mn soils, greater differences in extractable Mn were observed among soil types and soil pH levels than among Mn rates. Extractable Mn was correlated with soil clay content and total soil Mn. Organic matter content with a narrow range from 1.0 to 2.9%, silt content and cation exchange capacity (CEC) were not correlated with extractable Mn. The extractable Mn decreased as soil pH increased for the H₂O, NH₄OAc alone, and DTPA extractants making them preferable for predicting soil Mn availability since higher pH causes Mn to be less available to the plant.

¹ Contribution from the Univ. of Georgia Agric. Expt. Stn., Georgia Station, Experiment, GA 30212. Presented before Div. S-4 and S-2 of the Soil Sci. Soc. Am., Los Angeles, Calif., 16 Nov. 1977.

² Assistant Professor and Professor of Agronomy, respectively.

Received for publication April 25, 1977. Accepted for publication March 29, 1978.