杂草伴生时间对胡麻产量的影响

目的]探究杂草伴生时间对胡麻产量的影响,为确定胡麻田杂草的防除适期提供参考。方法]2015年于甘肃省兰州市榆中县研究杂草伴生时间(0、10、20、30、40、50、60、130 d)对胡麻产量的影响。结果]杂草伴生时间对胡麻产量具有显著影响,伴生时间越长产量越低。杂草伴生10、20 d,胡麻减产幅度不大,为2.81%、5.11%;伴生30、40 d后,胡麻产量有一个突降过程,减产幅度为17.42%、21.35%。结论]胡麻田人工或化学除草的适期为胡麻苗齐后20 d(该时期胡麻株高约为7 cm),该时期除草可将产量损失降至最低。

Influences of Weeds Associated Time on Yield of Linseed

Objective] The aim was to explore effects of weeds associated time on yield of linseed, to provide a reference for weeds control in linseed field.Method] Effects of weeds associated time(90, 10, 20, 30, 40, 50, 60, 130 d) on yield of linseed were studied in Yuzhong County, Lanzhou City, Gansu Province in 2015.Result] 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 were smaller when the associated time of weeds and linseed were 10 and 20 days, the yield reduction rates were 2.81%and 5.11%, respectively.The yield of linseed had a sudden drop when the associated time were 30 and 40 days, the yield reduction rates were 17.42%and 21.35%, respectively.Conclusion] The op-timum stage of artificial or chemical weed control in linseed field is 20 days after emergence of linseed(plant height of linseed is 7cm), weed control in the period can decrease the yield loss to a minimum.