白云石粉对皖南酸性红黄壤磷组分及磷有效性的影响

在施用P肥的基础上配合使用白云石粉,用酸性土壤无机P分级方法测定皖南红黄壤各形态P的含量。结果表明:使用P肥能明显提高土壤全P、无机P和土壤速效P含量;土壤速效P与无机P各组分的相关性以Al-P最好,Fe-P、O-P次之,Ca-P最差。施用白云石粉,当季土壤Ca-P含量及其在无机P中所占的比例明显提高,Al-P的形成受到抑制,但随着时间的推移,却更有利于有效性较高的Al-P含量的增加。

Effects of Dolomite on Chemical Fractions and Availability of Phosphate in Acid Red and Yellow Soil of South Anhui Province

Effects of dolomite on chemical fractions and availability of phosphate in red and yellow soil of south Anhui Province were studied. Results showed that application of P fertilizer could improve the contents of total P and inorganic P significantly, while decreased the content of organic P. The correlations between the contents of available P and various fractions of inorganic P were best for Al-P, Fe-P and O-P second, and Ca-P worst. Al-P is the most important source of available P. As time passed by, the effect of dolomite increasing the content of Al-P was getting more significant.