Effects of long-term fertilization on organo-mineral complex status in soils

Long term application of inorganic fertilizer, organic manure, or combined application of both could increase the original soil compound of fluvo aquic soil and arid red soil Combined application of organic manure and inorganic fertilizer could also increase the original soil compound in the topsoil, while single application of inorganic fertilizer had less effect on the original soil compound of paddy red soil Besides, long term fertilization could decrease the original soil complex degree, but increase the adding compound and adding complex degree of the three sorts of soil The soil applied with organic manure or combined with inorganic fertilizer was higher in adding compound, but lower in adding complex degree than that applied with inorganic fertilizer Long term fertilization could influence the classification of particle diameter of organo mineral complex Specifically, fertilization could increase the levels of clayey and silty compexes, and decrease the level of sandy complex Long term application of organic manure, or combined with inorganic fertilizer could increase the levels of three groups of complexes (G0: water dispersing complex,G1: sodic dispersing complex and G2: grind sodic dispersing complex), and accelerate conversion of G0 and G1 groups of complexes into water stable G2 groups of complexes