有机肥对土壤磷素吸附的影响

本文研究发现,有机肥可以显著活化土壤本身的磷,并能减少磷的吸附,前者是由于有机肥分解所产生的有机酸,后者是由于有机肥中碳水化合物对吸附位的掩蔽。去除土壤有机质的试验进一步证明了有机质对吸附位的掩蔽作用。有机肥的水提液可以降低土壤对磷的吸附。证明了磷和有机物之间有竞争吸附的存在。

EFFECT OF ORGANIC MANURES ON SOIL PHOSPHORUS ADSORPTION

Experimental data showed that the addition of rice straw,pig manure,and milk vetch could increase the resin-P but decrease the P adsorption of soils with different properities.The former was ettri3uted to the dis solution and complexing effect of organic acids prnduced when incubation of organic manure with s oils,and,the later was believed to he due to some phosphorus adsorbing sites of soil masked by the carbohydrates in organic manure.This assumption was supported by the data that the removal of soil organic matter increased the P adsorption of soil and water soluble organic matter extracted from organic manures has the ability to compete with phosphate for adsorption of soil.