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Reason Analysis and Control Methods of Succession Cropping Obstacle

GAO Qun~(1,2),MENG Xian-zhi~2,YU Hong-fei~(1,2) (1.Shenyang Agricultural University,Shenyang 110161,China;2.Liaoning Scientific Academy of Microbiology,Chaoyang 122000,China)  
In the paper,the definition of succession cropping obstacle was stated.And its causes were also analyzed including the increase of harmful microorganism and soil-transmitted diseases,the salt accumulation and soil acidification,the plant autotoxicity,and so on.Based on the analysis,the control methods of succession cropping obstacle were put forward.
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