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Curling leaves and brown or yellow spots often indicate a potassium insufficiency. Potassium-starved plants are far more likely to succumb to drought stress, fungal attach or frost damage, and produce much smaller fruit.

Apply fast-acting Nutri-K directly to leaves as needed. Nutri-K uses the same patented technology as Nutri-Cal for quick delivery directly to the plant. The two products can be used in combination. 

Learn more about Nutrical here