Therefore diseases and physiological barrier are the main factors of continuous cropping barrie of watermelon.

因此,生理障碍和病理障碍是构成西瓜连作障碍的主导因素.

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Objective To discuss the internal and external factors'functional mechanism of ginseng continuous cropping obstacle.

目的探讨人参连作障碍的内外在因素作用机制.

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There were significant difference in growth characteristics and productivity in continuous cropping years.

不同连作年限土壤对黄瓜生长特性和产量均有极为显著的影响.

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