为提高苗木的产量和质量,减少除草用工量,我们于1986年春,在北川县海拔1800米,坡向南、西南的海量坪进行除草剂除草效果试验。圃地土壤为,片岩发育而成的黄土夹石壤土,黑土层10厘米,土层厚50厘米以上,苗木为1985年培育的杉木、柳杉。苗圃地上有茅草、蕨类和其它杂草。用除草剂、敌草枯、除草醚共进行6种用量喷洒。每种用量处理面积为1米~2,重复3次,随机排列,设不施化学除草剂作对照。每亩用量如下: In order to increase seedling yield and quality and reduce the amount of weeding used, we conducted a herbicidal herbicidal herbicidal test in the spring of 1986 at an altitude of 1,800 meters in Beichuan County, southwest and southwest of the slope. Soil garden for the development of schist made of loess folder stone loam, black soil 10 cm, 50 cm thick soil above, nursery stock for the year 1985 fir, cedar. There are thatch grass, ferns and other weeds on the nursery. With herbicides, diuron, weeding a total of 6 kinds of dosage spraying. Each dosage treatment area of ​​1 m ~ 2, repeated 3 times, random arrangement, set no chemical herbicide as a control. The amount of use per acre is as follows: