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一、主要磷肥品种及其性质我国目前磷肥品种有过磷酸钙、钙镁磷肥还有少量的磷铵、重过磷酸钙、硝酸磷肥和磷矿粉等。根据这些磷肥的溶解性质,可以把它们分为水溶性磷肥,枸溶性磷肥和难溶性磷肥三大类。 (一)水溶性磷肥:如过磷酸钙,一般为灰白色粉状物,一级品含五氧化二磷(P_2O_5)18%,含量每低2%降低一个等级。
First, the main types of phosphate fertilizer and its nature China’s current varieties of phosphate fertilizer are superphosphate, calcium magnesium phosphate and a small amount of ammonium phosphate, heavy superphosphate, nitrophosphate and phosphate rock powder. According to the dissolution properties of these phosphate fertilizer, they can be divided into water-soluble phosphate fertilizer, citric acid soluble phosphate and insoluble phosphate three categories. (A) water-soluble phosphate: such as superphosphate, generally gray-white powder, a product containing phosphorus pentoxide (P_2O_5) 18%, the content of each 2% lower by one level.