Grain News: Are your fields potassium deficient?

While crops, such as soybeans, remove large amounts of potassium, much of it eventually cycles back into the soil. Unlike nitrogen, phosphorus or sulphur, very little potassium is removed with harvest but remains in crop residue.

Don Flaten, a professor emeritus in the soil science department at the University of Manitoba, says one of the most common symptoms of potassium deficiency is when older parts of the plant appear chlorotic and leaves begin to yellow, especially at the tips and margins.

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