... green. Its essential component is α-tricalcium phosphate [α-Ca3 (PO4)2]. The content of phosphate (P2O5) in the product ranges from ... 14% to 16% above according to the different standards. Besides phosphate, it also contains some medium and trace elements such as ... , magnesium, iron, manganese, silicon, sulfur, etc, which can be absorbed and used by plants.The fused calcium-magnesium phosphate can be ...