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THE EFFECTS OF AGERATUM INTERPLANTATION IN HILLY CITRUS ORCHARD IN HUNAN PROVINCE ON CITRUS MITE AND INSECT POPULATIONS Soil nitrogen balance in citrus orchards of the Three Gorges area in Chongqing Status of soil fertility in citrus orchards of Chongqing Sanxia Reservoir Area Dynamics of soil fertility of citrus orchards in demonstration area of environmental immigrants，Northwest Guangxi Analysis on the soft nutrients of citrus orchards in demonstration are8 of environmental immigrants，Northwest Guangxi Study On heavy metal behavior characteristics of soil in citrus orchar ds of the Three Gorges Reservoir Region Soil phosphorus balance in citrus orchards of three gorges area in Chongqing Effects of weeding methods on weed community and its diversity in a citrus orchard in southwest Zhejiang. Study of classification of the soil nutrient status of citrus orchard in Hubei Province