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The Importance of Illite as a Source of Potassium in Nebraska Soils¹

ABSTRACT

The uptake of nonexchangeable K by alfalfa (Medicago sativa L.) from samples of the surface layers of 8 Nebraska soils in a greenhouse experiment was more closely related to illite contributed to the soils by fine silt (r = 0.85) than to K-bearing minerals contributed to the soils by other separates. Measurements of exchangeable K may underestimate the K-supplying power of Nebraska soils for alfalfa when relatively large amounts of illite are contributed to the soils by fine silt.

¹ Contribution from the Department of Agronomy, University of Nebraska, Lincoln. Published with the approval of the Director as paper no. 1747, Journal Series, Nebraska Agr. Exp. Sta.

² Former graduate student, University of Nebraska, and Professor of Agronomy, University of Nebraska, respectively.

Received for publication June 1, 1965. Accepted for publication November 15, 1965.