What is a Superphosphate Fertilizer? (with pictures)
26.08.2020· 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. It is also known as normal superphosphate fertilizer. Dicalcium superphosphate is the next grade, which contains anywhere from 35 to 38 percent phosphate, depending on the mix .