We extract citrate soluble phosphate from nitrophosphate fertilizer by EDTA solution and neutral ammonium citrate respectively then assay it.

• 分别用EDTA溶液和中性柠檬酸铵溶液萃取并测定硝酸磷肥中枸溶性磷含量,提出了EDTA萃取剂替代中性柠檬酸铵萃取剂的可行性。