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EFFECTS OF WATER STRESS ON THE PHYSIOLOGICAL CHARACTERISTICS OF PEPPER LEAVES IN ARID CLIMATES STUDY OF SLIGHTLY-WATER-SOLUBLE SLOW-RELEASE FERTILIZER ON SPRING CORN AND ENVIRONMENT EFFECT UNDER THE CONDITION OF DIFFERENT IRRIGATION AMOUNT Difference of Surface Area of Fine Roots of Robinia pseudoacacia in the Different Climate Regions of Loess Plateau Effect of arid climate on underground growth of Bothrichloa ischaemum community