本文件规定了无机肥料中EDTA可溶性磷含量的测定方法。该方法适用于由多种来源组成或混合而成的肥料，如过磷酸钙、磷酸铵、过磷酸钙和/或硝酸磷酸盐。不适用于含有钙镁磷酸盐的肥料。

This document specifies the method for the determination of the EDTA soluble phosphorus content of inorganic fertilizers. The method is applicable for fertilizers composed of or blended from multiple sources such as superphosphate, ammonium phosphate, triple superphosphate, and/or nitrophosphate. It is not suitable for fertilizers containing calcium magnesium phosphates.