有机肥对土壤磷吸附一解吸的直接影响

本文采用自行设计的一种扣除来自有机肥中磷的方法,对有机肥影响土壤磷吸附与解吸的直接作用进行了研究。结果表明,猪粪和牛粪均能明显降低两种水稻土对磷的吸附,增加磷解吸;而纤维素只有在土壤磷水平较高时才起作用。上述作用在红壤性水稻土中优于青紫泥;在同一土壤上,对磷水平高的土壤的作用明显大于磷水平低的土壤。在有机肥对土壤磷吸附—解吸的直接影响中,其中的可溶性有机机物起主要作用。

DIRECT INFLUENCE OF ORGANIC MANURE ON PHOSPHORUS ADSORPTION-DESORPTION IN THE SOILS

In present paper the direct effect of organic manure on phosphorus adsorption-desorption in two paddy soils was studied by a specially designed method to separate the phosphorus coming from minerialization of the organic manure during desorption period. The results showed that both pig feces and cow feces could significantly reduce P-adsorption and increase P-desorption in the soils while cellulose could only play those effects in higher P level soils, especially in the ultisol. On the same type soil, the effect was much more pronounced in the higher P-level soils. The soluble organic substances of organic manure played a main role in the direct effect of organic manure on phosphorus adsorption-desorption in the soils.