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This article in SSSAJ

  1. Vol. 30 No. 2, p. 242-245
    Received: June 1, 1965
    Accepted: Nov 15, 1965

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

  1. Fawzi M. A. H. Abed and
  2. James V. Drew2



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.

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