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Effect of Liming and Organic Matter Content on the Availability of Native and Applied Manganese¹

ABSTRACT

A large amount of the soluble Mn added to soils was rapidly converted to nonexchangeable forms in both incubation and field studies. The addition of lime further decreased the amount of exchangeable Mn (NH₄OAc-extracted). The acid-extractable Mn content of the soil showed no decrease at the end of 3 weeks' incubation but did after 6 weeks' incubation.

The moisture content of the sample previous to extraction had an effect on the exchangeable Mn content. Less exchangeable Mn was extracted when the soil was kept moist after the sample had been taken than when it was first air-dried. This effect was most pronounced on a high organic matter soil which had been limed.

The addition of peat to a low organic matter soil increased the exchangeable Mn conent of the acid soil when maintained in a moist condition. The peat caused a decrease in the acid-extractable Mn in the limed soil.

¹ Contribution from the Department of Soils, North Carolina Agr. Exp. Sta., submitted with the approval of the Director as Paper No. 958 of the Journal Series. Part of a dissertation, submitted by the senior author, in partial fulfillment of the requirements for the M.S. degree at North Carolina State College. Presented before Div. IV, Soil Science Society of America, Lafayette, Ind., Aug. 7, 1958.

² Formerly graduate student and now Agronomist, Estacion Agricola Experimental, Palmira Valle, Colombia; and Director, Soil Testing Division, North Carolina Department of Agriculture, and Associate Professor of Soils, North Carolina State College, respectively.

Received for publication October 15, 1958. Accepted for publication February 17, 1959.