Boron Tolerance of Squash, Melon, Cucumber, and Corn1

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Abstract
Squash (Cucurbita pepo), cucumber (Cucumis sativus), muskmelon (Cucumis melo) and corn (Zea mays.) plants were grown in sand culture with B as the variable. The plants were harvested when they showed a definite gradation of B toxicity symptoms from severe to none. Mature blades were analyzed for total B. A significant decrease in top growth took place in corn and cucumber for culture solutions with B concentrations greater than 2 ppm; in squash and muskmelon, greater than 4 ppm. A 50% decrease in top growth took place in solutions with 6, 12, 12 and 16 ppm of B for cucumber, squash, muskmelon and corn, respectively, with cucumber the most sensitive and corn the least sensitive to B supply. The critical concentrations for B toxicity in mature blades at the onset of decreased top growth are 100, 400, 800 and 1,000 ppm, dry basis, for corn, cucumber, muskmelon and squash, respectively.

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