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本文报道不同剂量(浓度)草甘膦在松杉撒播苗圃苗后除草二次小区试验和大区应用试验结果。表明草甘膦是火炬松、湿地松撒播苗圃优良的苗后除草剂,对马尾松、杉木苗圃的苗后除草也有一定应用价值。使用时期:火炬松、湿地松至少可使用至苗高15cm以内生长阶段(6月30日左右);马尾松只能在齐苗后10d以内或顶芽初生叶长至1cm以内使用,当顶芽和初生叶长至5cm左右时(6月23日左右)使用则药害严重;杉木苗都有少量药害,只能在需要间苗的苗圃上使用。使用剂量:10％含量的草甘膦液剂每hm~21.5L兑水900kg喷雾,可杀死大部分三叶期以内的杂草,对少数较大的残存杂草也有强烈抑制作用,综合除草效果可达90％以上,药效期可保持25～30d。
This paper reports the different dosage (concentration) of glyphosate in the seedling nursery pine cedar secondary weeding test and regional application test results. It showed that glyphosate was an excellent post-emergence herbicide for Pinus taeda and Slash pine seedling nursery, and had certain value for post-emergence weed control of Pinus massoniana and Cunninghamia lanceolata nursery. Use period: Loblolly pine, Slash pine can be used at least to the height of 15cm within the growth stage (about June 30); Massoniana within 10d after Qi Miao only or within the first to 10cm, And when the primary leaves grow to about 5cm (around June 23), the injury is serious; the Chinese fir seedlings have a small amount of phytotoxicity and can only be used on the nurseries where the seedlings are needed. The use of dosage: 10% glyphosate liquid spray per hm ~ 21.5L watered 900kg, can kill most of the weeds within the clover period, a small number of the remaining weeds also have a strong inhibitory effect, the comprehensive weeding The effect of up to 90%, the validity period can be maintained 25 ~ 30d.