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Effects of organic amendments on cotton Verticillium wilt and their mechanisms to control disease EFFECTS OF AMENDMENTS ON ACCUMULATION OF ZINC AND CHROMIUM IN INTERCROPPING OF CORN AND SOYBEAN The Effects of Different Soil Amendments on the Germination and Seedling Growth of Creeping Bentgrass Dynamics of Soil Organic Carbon and Nutrient Contents Under Long Term Organic Amendments in Fluvo-aquic Soil Region North China