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一、油葵后茬大豆连作障碍的重度表现油葵后茬正常生长的大豆田,叶色浓绿,植株挺拔,病害尤其是生理性病害少,结荚从底到顶分布均匀,无明显早衰症状。若油葵、大豆接茬连作3年以上,病害逐年增多,会出现程度不同的大豆连作障碍。大豆连作障碍严重时表现为株体矮小,早衰,根腐、黄萎病和病毒病频发,多花而不实现象或者结荚不均匀(上下少、中部多),产量下降明显。
First, the sunflower crop after continuous cropping obstacle of severe performance Sunflower normal crop growth of soybean field, leaf color dark green, plant upright, disease especially physiological disease less, pod distribution from bottom to top, no obvious premature senility symptoms. If the sunflower, soybean stubble continuous crop for more than three years, the disease increased year by year, there will be different levels of soybean continuous cropping obstacles. Soybean cropping obstacle is serious when the performance of short stature, premature aging, root rot, Verticillium wilt and virus disease frequently, but not the phenomenon of more flowers or uneven pod (less up and down, central and more), the output decreased significantly.