allelopathic effect of root exudates on pathogenic fungi of root rot in continuous cropping soybean was studied by sand culture, water culture, and indoor culture experiments.
采用砂培、水培和室内培养等试验方法研究了连作大豆根分泌物对根腐病病原菌的化感作用。
the results above showed that water soluble carbohydrates, amino acids and organic acids from continuous cropping soybean had significantly close correlation with root rot.
上述结果表明,大豆连作土壤有机化合物与根腐病发生存在极密切关系,它们是根腐病严重发生的重要物质诱因。
the kinetic characters of mo nutrition under stress caused by continuous cropping soybean were investigated by pot experiment, field experiment and chemical analysis.
本文通过田间与盆栽对比试验及室内分析相结合的方法,研究了大豆连作胁迫下钼营养的变化特征。
during recent years , continuous cropping soybean , lack of soil tillage and lack of effective herbicide for perennial sowthistle caused perennial sowthistle rampant .
近年来,由于大豆连作普遍、土壤耕作次数减少且无防除苣荬菜的特效药,导致大豆田苣荬菜的危害日趋严重。