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Effects of fertilization on soil quality in two different cropping systems Spatial variations of soil organic carbon and available microelement contents in interlaced area of vegetable lands and grain lands----A case study in Shouguang City, Shangdong Province Ecological principles of high and stable yield of wheat-corn-rice triple cropping system in Yangtze River delta region Parameters of energy flow in wheat - corn intercropping agroecosystem The relationship between grain output and fertilizer input in wheat-corn cropping area of the Huang-Huai-Hai plain Chemical fertilizers input and soil nutrient resources in winter wheat-corn rotation system in Huantai County