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Influence of Exchangeable K and Na in the Soil on Growth and Chemical Composition of Lovell Peach Seedlings and Other Crops¹

Synopsis: In Yolo loam and Hanford sandy loam, peach seedlings, onions, carrots, radishes, vetch, and alfalfa tolerated exchangeable K levels equal to 22% or more of exchange capacity. Thirty-six percent K reduced growth or caused leaf injury of all species except vetch and alfalfa. Peach seedlings were relatively sensitive and vetch relatively tolerant to high exchangeable Na. About 47% leaf R and trace percentages of Na reduced peach seedling growth.

² Chemist, Department of Soils and Plant Nutrition; Horticulturist, Department of Horticulture; and Senior Laboratory Technician, Department of Soils and Pllant Nutrition, respectively.

Received for publication November 15, 1958.