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Contrasting Release Characteristics of Potassium in Alluvial and Associated Upland Soils of Indiana¹

ABSTRACT

The uptake of K from alluvial soils was similar to that from associated upland soils under low cropping intensity. Under the high intensity cropping of a Neubauer experiment, the alluvial soils released more K. Within the exchangeable K range 40 to 180 ppm., K uptake was 67 ppm. greater from the alluvial soils than from the associated upland soils at the same exchangeable K level. The reduction of exchangeable K in the soil due to crop removal was greater in the upland than in the alluvial soils. There was no statistical correlation between the mineralogical composition of the soil and the K released.

¹ Journal paper No. 2180 Purdue Agr. Exp. Sta., Lafayette, Ind. Presented before Div. IV, Soil Science Society of America, Aug. 7, 1958, at Lafayette, Ind.

² Formerly Graduate Assistant, Purdue Univ., now Soil Scientist, U.S. Army Electronic Research and Development Activity, Fort Huachuca, Ariz.; and Professor, Purdue Univ., respectively.

Received for publication August 19, 1963. Accepted for publication February 24, 1964.