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本文通过小区试验及大田调查,研究了豆田恶性杂草——苍耳的生长,为害习性及竞争,明确了苍耳有生长速度快,蔓延迅速,竞争力强,对大豆生长发育影响大,在低密度条件下亦能造成严重减产特点。 化学除草剂排草丹(苯达松)、虎威、杀草丹、赛克津等均能有效地防治苍耳的为害。在大豆播后苗前,每亩用赛克津35 g(有效剂量,下同)。土壤处理;在苍耳2—5叶期,每亩用排草丹37.5 g,或虎威33.3 g,或杀草丹200g茎叶处理,均可达到95％以上的防效。排草丹、虎威等与稳杀得、盖草能或拿捕净等除草剂混用,还可兼治一年生和多年生禾本科杂草。
In this paper, we studied the growth, damage habit and competition of the vicious weed, Xanthium sibiricum, through field plot test and field investigation. It was found that Xanthium sibiricum has fast growth, rapid spread, strong competition and great influence on the growth and development of soybean. Low density conditions can also cause serious cuts in production. Chemical herbicide Pai Dan (bentasone), tiger Granville, herbicide Dan, Saikai Jin Dengjun can effectively prevent the damage. Before sowing in soybean seedlings, with acai Mijun 35 g (effective dose, the same below). Soil treatment; Xanthium 2-5 leaf stage, with the row of straw Dan 37.5 g, or Tiger Granville 33.3 g, or kill grass Dan 200g stems and leaves, can reach more than 95% control effect. Pai Dan, tiger Granville and other stable and kill too, cover grass or catch net herbicide mixture, but also both annual and perennial grass weeds.