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杂草是青海云杉幼苗的大敌,雨季或林忙季节,人工除草不及时,往往造成苗圃草荒。杂草与幼苗争水、争肥、争光照,影响幼苗的正常生长发育,同时,人工拔草易带苗带土而透风,轻则影响苗木生长,重则造成小苗死亡。此外,人工除草费工、费时、费钱,劳动强度又大。为了改变这种状况,我们自1975年至1979年,经过五年在试验田内对青海云杉化学除莠技术进行了反复研究,筛选出西玛津、扑草净两种化学除莠剂,
Weeds are the enemy of Qinghai spruce seedlings, rainy season or busy forest season, artificial weeding is not timely, often resulting in nursery grassland shortage. Weeds and seedlings contend for water, fight fat, fight light, affecting the normal growth and development of seedlings, while easy to pull the grass with artificial grass and soil permeability, ranging from the impact of seedling growth, weight is caused by the death of seedlings. In addition, artificial weeding workers, time-consuming, expensive, labor-intensive. In order to change this situation, from 1975 to 1979, after five years in the experimental field of Qinghai spruce chemical herbicides were repeatedly studied and screened Simazine, prometryne two kinds of chemical herbicides,