播种密度对胡麻田杂草发生及胡麻产量的影响

目的]明确播种密度对胡麻田杂草发生以及胡麻产量的影响,为胡麻田杂草的综合治理提供参考。方法]通过大田试验研究胡麻不同播种密度(45、60、75、90、105、120 kg/hm~2)对胡麻田杂草发生以及胡麻产量的影响。结果]胡麻播种密度与杂草发生量关系密切,播种密度越高,杂草发生越少。胡麻播种密度对胡麻产量有显著影响,随着播种密度的提高,胡麻产量逐渐降低,主要是由胡麻密度越高,倒伏越严重,造成的减产率越高所致。结论]综合胡麻密度与杂草发生、产量构成的关系并考虑倒伏因素,甘肃省中部地区胡麻种植的适宜密度为60 kg/hm~2。

Influences of Planting Density on Weed Occurrence in Linseed Field and Yield of Linseed

Objective] Clear the influences of planting density on weed occurrence in linseed field and yield of linseed, thereby providing refer-ences for integrated control of weed in linseed field.Method] Via field experiment, the influences of different planting densities (45, 60, 75, 90, 105 and 120 kg/hm2) on weed occurrence in linseed field and yield of linseed were studied.Result] Linseed planting density was closely related to weed occurrence in linseed field, the higher of planting density, the lighter of the weed occurrence.Planting density also had a signifi-cant effect on yield of linseed.With the increase of planting density, weed occurrence reduced gradually and the yield of linseed was gradually decreased.The main reason was that the higher of the planting density, the more serious the linseed lodged, and the higher of yield reduction rate of linseed.Conclusion] By weighing the relationship between planting density and weed occurrence as well as yield component, also con-sidering lodging factor of linseed, the suitable density of linseed planting is 60 kg/hm2 in the central region of Gansu Province.