一、过磷酸钙呈白灰色粉末或颗粒状,含磷12%～18%,并含有40%～50%的硫酸钙。因含有3.5%～5%的游离酸,使得过磷酸钙呈酸性反应。用过磷酸钙做种肥,可和有机农家肥混合施用,也可单独施用,每667米2施用20～25千克为宜。用过磷酸钙拌种时,应随拌随用。在水稻移栽时可用过磷酸钙溶液醮根。 First, the superphosphate was white gray powder or granular, phosphorus 12% to 18%, and contains 40% to 50% of calcium sulfate. Because of containing 3.5% to 5% of the free acid, makes the acid calcium phosphate reaction. With superphosphate as fertilizer, and organic fertilizer can be mixed, but also can be applied separately, 667 m 2 per 20 to 25 kg is appropriate. With superphosphate seed dressing, should be mixed with the mix. In transplanting rice can be used superphosphate solution roots.