What is superphosphate fertilizers?

Answer 1

a naturally slow release phosphate fertilizer. plants need three major nutrients: nitrogen, phosphate, and potash (potassium) or NPK for short.

Super phosphate is a fertilizer produced by the action of concentrated sulfuric acid H2SO4

on powdered phosphate rock. Ca3(PO4). Calcium sulphate and calcium phosphate is yielded.

3 Ca3(PO4)2 + 6 H2SO4 → 6 CaSO4 + 3 Ca(H2PO4)2

Tomato plants and any flowering plant can use 1/3 more super phosphate if you are using NPK 10 10 10. Apply on the surface of the soil and it will be slow acting dissolving into the soil over a six month period with normal watering. The extra phosphate will also help build a stronger root and trunk system. In addition to adding phosphate it adds calcium, and sulfur to your garden soil. Since the phosphate rock it is made from is not pure it adds magnesium, manganese, copper, iron and other minor elements to your soil. The reaction with water is slightly acid. Your garden should be checked once a month for Ph, nitrogen, phosphate and potassium. Cheap test kits can be bought at your garden store.