The usual chemical form of potassium in commercial fertilizers is as

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The usual chemical form of potassium in commercial fertilizers is as potassium chloride. This is because potassium chloride is highly soluble in water and provides a readily available source of potassium for plants. Other forms, such as potassium bromide or potassium phosphite, may not be as effective or cost-efficient for use as a fertilizer. Potassium carbonate may be used in certain situations but is less commonly used than potassium chloride.

The Usual Chemical Form of Potassium in Commercial Fertilizers Is