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Spatio-temporal distribution of multiple cropping systems in the Poyang Lake region Expert system design for agroecological patterns of multiple cropping in Lower Reaches of Liaohe PlainⅠ.Design thought of the system Improving soil fertility with different multiple cropping patterns in upland red soil Using remote sensing to determine spatio-temporal variations in winter wheat growing area in the North China Plain Evaluation on comprehensive benefits of multiple cropping systems on upland red soil Ecophysiological effects of multiple cropping of winter wheat-spring corn-summer corn in Huanghuaihai Plain Characteristics of energy-nutrient flow of multiple cropping rotation systems in paddy field Monitoring multiple cropping index using MODIS NDVI data- A case study of Bohai Rim Effect of Water-nitrogen Coupling on Photosynthesis and Soil Water Use of Oil Sunflower in Drip-irrigated Multiple Cropping System