Potassium (K) aids in water uptake and starch production. Adequate levels are required for disease, drought and frost tolerance. As with N, a major symptom of K deficiency is the yellowing of the leaf margins. Potassium deficient plants will have reduced growth, smaller leaves and thinner stands.

The majority of soils in Saskatchewan have sufficient K levels. Grey and sandy soils, however, can be deficient. Use a soil test to determine the rate required to correct any deficiency.

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