category | is also called herbicide or herbicide. Chemicals that kill weeds or harmful plants without affecting the normal growth of crops. It can be used to control weeds in farmland or kill weeds or shrubs in non-agricultural farmland. According to its characteristics can be divided into selective herbicides and herbicides. Selective herbicide refers to the use of a certain dose and concentration range, can selectively kill some kinds of plants, and the other kinds of plants are not harmful. Such as 2,4-D can control the wild arrowheads in the paddy field, and harmless to Rice. All weeds and crops exposed to the herbicide can be killed after the application of the herbicide, such as sodium pentachlorophenol. 2,4-D(2, 4-dichlorophenoxyacetic acid) and 2,4,5-T(2,4, 5-trichlorophenoxyacetic acid) are strong carcinogens. |
Use | a chemical used to remove weeds (see "weeds" [weed]). Selective Herbicides can specifically kill only the weeds that harm the crops, and do not damage the crops in the field. For example, the synthetic * auxin -2,4-D can control broadleaf grass in the field. Herbicides are also useful for the removal of wild grass from wastelands, without selectivity, to kill all exposed plants, such as Paraquat (Paraquat). |