Effects of different fertilization on soil organic carbon distribution and storage in micro-aggregates of red paddy topsoil The inter-annual characteristics of nitrogen recovery efficiency of double cropping rice system on paddy soil under long-term fertilization Variation of soil phosphorus under long-term fertilization in red paddy soil Microbial community diversity and enzyme activity of red paddy soil underlong-term combined inorganic-organic fertilization Effect of fertilization constitution on sulfur fertility development and supplied S ability of red paddy soil Assessment and effects of integrated soil fertility in red paddy soil under different longterm fertilization