... Southeast Asia The fused calcium-magnesium phosphate (FMP) is a kind of citric acid soluble phosphate-based multiple-element fertilizer, ... different standards. Besides phosphate, it also contains some medium and trace elements such as calcium, magnesium, iron, manganese, silicon, sulfur, etc, ... can be absorbed and used by plants.The fused calcium-magnesium phosphate can be used more suitably as base ...