Is Epsom salt high in phosphorus?
No, Epsom salt (magnesium sulfate) is not high in phosphorus; in fact, it contains no phosphorus at all [1.4.1]. Its chemical analysis is technically 0-0-0, meaning it does not provide any of the three major macronutrients—nitrogen, phosphorus, or potassium—required for plant growth [1.4.1]. While Epsom salt can be used as a soil amendment to provide magnesium and sulfur to certain plants, it should not be relied upon as a source of phosphorus or as a general-purpose fertilizer, as it lacks the essential nutrients that fertilizers typically provide [1.4.1].
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