Moreover using single weed killer in farmland for a long term often causes the changes of crops and the weed communities and brings about new problems for control weeds .

而且由于农田中长期单一使用某类 除草剂，引起了农田作物和杂草群落中杂草组合的变化，给杂草防除工作带来了新的问题。

You need a selective weed killer that won 't damage your garden flowers .

你需要一种精选的 除草剂，不会伤害你花园的花。

Transgenic canola plants in North Dakota had received genes making them resistant to herbicides such as the weed killer Roundup .

种植于北达科他州的转基因油菜中植入了抗除草剂基因，使之对 农达等除草剂产生抗性。

Research on Analytical Method of Binary Complex Weed Killer Butachlor and 2 4-D Butylate

二元复配 除草剂丁滴乳油的分析方法研究

THE EXPERIMENT ON CONTROLLING LYSIMACHIA FORTUNEI BY CHEMICAL WEED KILLER ( 1990 ) Studies on the chemical weed - killer in the lily plants

化学 防除 星宿菜试验（1990年）百合田杂草的化学防治

Study on Applied Technique of Chemical Weed Killer in Forestry Nursery

林业苗圃化学 除草剂应用技术研究

Effects of the Chemical Weed Killer on Weeds in Maize Fields

玉米地化学 除草 药效试验