对江苏徐淮地区6个石灰性土壤黄潮土样本进行盆栽试验,供试作物为黑麦草。结果表明,过磷酸钙施入土壤后,主要转化为水溶性磷和Fe、A1—P。施磷量大,二者的增量也大,但随时间的推移,二者又呈下降趋势。O—P和Ca—P无以上规律。黑麦草从石灰性土壤中主要吸收水溶性磷和Fe、A1—P,而不是O—P和Ca—P。 A pot experiment was conducted on six calcareous soil samples of yellow soil in Xuhuai area of ​​Jiangsu Province. The test plant was ryegrass. The results showed that after the application of superphosphate into the soil, the main conversion to water-soluble phosphorus and Fe, A1-P. The amount of phosphorus applied is large, and the increment of both is also large, but as time goes on, both of them show a downward trend. O-P and Ca-P without the above rules. Ryegrass mainly absorbs water-soluble phosphorus and Fe, A1-P, but not O-P and Ca-P from calcareous soils.