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过磷酸钙是用硫酸分解磷矿粉制成的,主要成份是磷酸一钙和石膏,还含有硫酸铁、硫酸铝和游离硫酸、磷酸等,具有一定的吸湿性和腐蚀性,是一种水溶性磷肥。针对磷在土壤中易被固定、移动性小、流失少的特点,在施用方法和用量上均要有所讲究: 1、作种肥 磷肥拌种,可以满足作物在幼苗期的磷素营养。可以将过磷酸钙掺上5～10倍腐熟的有机肥料,如肥园土、垃圾、猪牛粪等拌种,随拌随播,当天用完。一般情况下亩用肥量4～5公斤为宜。为了中和过磷酸钙中的游离酸,也可先与1～2％的草木灰混合后再施。
Superphosphate is made of sulfuric acid decomposition of phosphate rock, the main ingredient is calcium phosphate and gypsum, also contains iron sulfate, aluminum sulfate and free sulfuric acid, phosphoric acid, has some moisture and corrosive, is a water-soluble Sex phosphate. For the phosphorus in the soil is easy to be fixed, mobility, loss of less features, in the application methods and dosage should pay attention to: 1, as a kind of fertilizer phosphate dressing, to meet crop phosphorus nutrition in seedling stage. SSP can be mixed with 5-10 times the maturity of organic fertilizers, such as fertilizer garden soil, garbage, pig manure and other seed dressing, with mixed with the broadcast, the same day run out. Under normal circumstances mu with fertilizer 4 to 5 kg is appropriate. In order to neutralize the free acid in superphosphate, it can be mixed with 1-2% ash afterwards.