What is a Superphosphate Fertilizer? (with pictures)
Jan 30, 2020· The three different types of superphosphate fertilizers are distinguished by the amount of phosphate in them. Single superphosphate is the mildest grade, and contains between 16 and 20 percent phosphate. It is typically available in a liquid or a dry formula, both of which are used with the same efficiency by plants.
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