以陇亚10号为指示品种，采用简单对比，大区设计，观察杂草伴生时间对胡麻产量影响，以探求胡麻田除草适期。结果表明，杂草伴生时间越长，亚麻产量越低。杂草伴生10、20 d时，胡麻减产幅度不大，分别为2.51%、4.73%；伴生30、40 d时，胡麻产量有一个突降过程，减产幅度分别为15.93%、23.42%。胡麻田人工或化学除草的适期为胡麻苗齐后20 d(此期胡麻株高为7 cm左右)。

Longya 10 as indication specie， comparation study is carried out in the field， the impact on associated time of weed on flax yield is observe， in order to seekthe optimum period of weeding in flax field. The associated time of weeds and linseed had a significant effect on yield of linseed， the longer of the associated time， the lower of the yield of linseed. The yield reduction rates of linseed are smaller when the associated time of weeds and linseed are 10 and 20 days， are 2.51% and 4.73%， respectively. The yield of linseed have a sudden drop when the associated time are 30 and 40 days， the yield reduction rates are 15.93% and 23.42%， respectively. The optimum stage of artificial or chemical weed control in linseed field is 20 days after emergence of linseed(plant height of linseed is 7 cm)， weed control in the period can decrease the yield loss to a minimum.

S563.2

国家胡麻产业技术体系草害防控岗位(CARS-17-GW-7)