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An Evaluation of the Availability of K in Crop Residues¹

ABSTRACT

A greenhouse investigation was conducted to evaluate the availability of K added in plant residue materials. A high degree of recovery (90%) of the K added in the residues was possible on intensive cropping by common ryegrass (Lolium multiflorum). The K added in corn (Zea mays L.) and alfalfa (Medicago sativa L.) residues did not differ in availability and was equal to K added in KCl.

Key Words: K source • K uptake

¹ Journal Paper no. J-5447 of the Iowa Agr. & Home Econ. Exp. Sta., Ames, Iowa. Project no. 1190.

² Former Associate in Agronomy and Professor of Soils, Iowa State University. The senior author is now Assistant Water Scientist, Department of Water Science and Engineering, University of California, Davis.

Received for publication May 22, 1967. Accepted for publication June 6, 1967.