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Soil enzyme activity in spring potato fields under different mulching practices in double rice cropping area A comparison of the effects of controlled release urea, stable urea and microorganisms increasing double rice yield and nitrogen use efficiency CONSTITUTION OF THE AUTUMN POPULATION OF RICE WATER WEEVILS IN DOUBLE CROPPING RICE AREA OF ZHEJIANG PROVINCE, CHINA Multivariate regression analysis of greenhouse gas emissions associated with activities and populations of soil microbes in a double-rice paddy soil Effects of winter crops on enzyme activity and morphological characteristics of root in subsequent rice crops ON THE FORMATION OF DESTRUCTIVE POPULATION OF RICE WATER WEEVIL IN DOUBLE RICE CROPPING AREA OF ZHEJIANG PROVINCE,CHINA Effects of long-term double-rice and green manure rotation on rice yield and soil organic matter in paddy field