Allelopathic effects of tree-leaf litter on the germination and seedling phase of wheat in inter-planted systems of trees (fruits trees) and grain crops Emergy analysis on different planting patterns of typical watersheds in Loess Plateau. Nutrient and water cycling in red soils with different planting system and their management Efficient multiple planting system in sandy soil along the lower reaches of Yangtze River in Jiangsu Effect of the change of rice planting system on the formation of outbreak population of brown planthopper, Nilaparvata lugens