Effects of long-term fertilization on spring season weed community in winter fallow paddy field in red soil area under double-rice cropping system Effects of rice cropping systems on the restoration of aquaculture pond eutrophication and its prospective application ON THE FORMATION OF DESTRUCTIVE POPULATION OF RICE WATER WEEVIL IN DOUBLE RICE CROPPING AREA OF ZHEJIANG PROVINCE,CHINA CONSTITUTION OF THE AUTUMN POPULATION OF RICE WATER WEEVILS IN DOUBLE CROPPING RICE AREA OF ZHEJIANG PROVINCE, CHINA Comparison of Yield and Resource Utilization Efficiency among Different Maize and Rice Cropping Systems in Middle Reaches of Yangtze River