一、过磷酸钙白灰色粉末或颗粒状,含磷量为12%～18%,并含有40%～50%硫酸钙。由于这种肥料含有3.5%～5.0%游离酸,使得过磷酸钙呈酸性反应,用过磷酸钙做种肥,可改善作物幼苗的磷素营养。生产中选用质量好、含磷量高、三氯乙醛含量不 First, superphosphate white gray powder or granular, phosphorus content of 12% to 18%, and contains 40% to 50% of calcium sulfate. Because this fertilizer contains 3.5% to 5.0% of free acid, making acid superphosphate reaction, the use of superphosphate fertilizer, can improve crop phosphorus nutrition. Production of good quality, high phosphorus content, the content of chloral is not