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Identification of Lime-Deficient Peat Soils¹

ABSTRACT

Field and laboratory studies were made of 37 Minnesota peat bogs to fix the upper limit of lime content in the surface of lime-deficient bogs, and to determine criteria of lime-deficient peats³ other than the lime content. Field trials to determine whether the peats were lime-deficient, using common farm crops, were conducted on peats from 35 uncultivated bogs and two cultivated bogs. All lime-deficient peats and most of the lime-sufficient peats were extremely acid as indicated by pH measurements. A close correlation existed between the lime (calcium oxide) content and lime-deficiency. No native plant species were found to indicate lime-deficiency reliably.

¹ Paper No. 2935 of the Scientific Journal Series, Minnesota Agr. Exp. Sta. Univ. of Minnesota, St. Paul, Minn. Presented before Division IV-A, Soil Science Society of America, Cincinnati, Ohio, Nov. 20, 1952.

³ The term, lime-deficient peats, is used here to indicate those which, after adequate artificial drainage, proper seedbed preparation, and fertilization, require some form of lime to permit satisfactory growth of crops, while lime-sufficient peats need no lime but usually require fertilization.

² Deceased, Oct. 1, 1953. BPISAE, U.S. Dept. of Agriculture and University of Minnesota.

Received for publication July 2, 1953.