Potassium deficiency is characterized by a cupping or “puckering” of leaves and affects older leaves first. Leaf cupping is usually accompanied by a slight marginal chlorosis, with the leaf margins dying especially at the tip in severe cases. Leaf symptoms are accompanied by abnormal fruit development, cucumber fruit often developing a brown or spotted appearance and melons often developing abnormal flesh texture and off flavor.
Conduct soil and/or foliar nutrient analysis to confirm that the problem is nutritional. Follow recommended practices for fertility using a balanced fertilizer and treat for alkalinity or acidity as needed.
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Publication Revised July 2009