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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667m~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。二、三料过磷酸钙也称重过磷酸钙,呈白色颗粒状,含磷量40～50%。其性质比普通过磷酸钙稳定,易溶于水,其水溶液呈弱酸性反
First, the superphosphate was white gray powder or granular, containing 12 to 18% phosphorus, and contains 40 to 50% of the calcium sulfate. Because of containing 3.5% to 5% of free acid, makes the superphosphate acidic reaction, with superphosphate as fertilizer, and organic farming fertilizer can also be mixed, can also be applied alone, every 667m ~ 2 20 ~ 25 kg should. With superphosphate seed dressing, should be mixed with the mix. In transplanting rice can be used superphosphate solution roots. Two or three superphosphate material also weighed superphosphate, was white granular, phosphorus content of 40 to 50%. Its nature than the average calcium phosphate stability, soluble in water, the aqueous solution was weakly acidic