曲靖地区红壤多数缺乏有效磷素。从曲靖越州两种肥力红壤磷素状况分析,无机磷组成中作物容易吸收利用的磷酸钙、磷酸铝仅占5.2～13.4％,作物难以吸收利用的磷酸铁占32％,作物不能利用的包裹磷占54～62％。有效磷含量很低,一般都低于5～10ppM,个别红壤常年只有痕迹量。 Qujing most of the red soil lack of available phosphorus. From the analysis of phosphorus status in two fertile red soils in Qujing and Yuezhou, calcium phosphate is easily absorbed and utilized by inorganic phosphorus, with only 2.5-13.4% of aluminum phosphate and 32% of ferric phosphate difficult to be absorbed by crops. Wrapped crops can not be used Phosphorus accounts for 54 ~ 62%. Available phosphorus content is very low, generally less than 5 ~ 10ppM, only red soil some traces of perennial.