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Soil bacteria and their biochemical characteristics on reclamation of coal mines Influence of soil covered cultivation on shoot quality of Phyllostachys prominens Effects of temperature, soil humidity and soil cover on Plutella xylostella (Lepidoptera: Plutellidae) pupae emergence Studies on cold resistance of grape varieties rootstocks and soil coverings in North Shaanxi Water-saving Effect of the Full Plastic Film Mulching with Soil Covered on Plastic Film on First-crop and Second-crop Wheat