各种化学除草剂都有各自的特点,它们具有一定的选择性和杀草范围。同时,不同除草剂的吸收与输导方式,防除机理等也各异。一个地块长期单一应用一种除草剂,会使田间杂草的群落发生变化。另一方面,单独应用一种除草剂,往往杀草谱比较狭窄,还有的药剂存在影响下茬敏感作物的问题。如稻田使用杀草丹、丁草胺、禾大壮等 Various chemical herbicides have their own characteristics, they have a certain degree of selectivity and herbicide range. At the same time, the absorption and transmission of different herbicides, control mechanisms are also different. A single long-term use of a single herbicide, will make the field weed community changes. On the other hand, the application of a single herbicide alone often results in a narrower herbicidal spectrum, and some pesticides have the problem of affecting sensitive crops in the next crop. Such as rice fields to kill grass Dan, butachlor, Wo Dazhuang and so on