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Symptoms:
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.

Control:
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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Educational programs of the Texas AgriLife Extension Service are open to all people without regard to race, color, sex, disability, religion, age, or national origin.

Publication Revised July 2009