Herbicides that can be used on sorghum include: atrazine, bromoxynil, 2,4-D butyl ester, diuron, simazine, etc.
Classification based on the movement of herbicides in plants:
(1) Contact herbicides: When the herbicide comes into contact with the weed, it only kills the part in contact with the herbicide. The local killing effect cannot be transmitted in the plant body. It can only kill the above-ground parts of weeds, but is less effective on the underground parts of weeds or perennial deep-rooted weeds with underground stems. Such as herbicides, paraquat, etc.
(2) Systemic conductive herbicides: After the herbicide is absorbed by the roots or leaves, coleoptiles or stems, it is transmitted into the plant, causing the plant to die. Such as glyphosate, prometryn, etc.
(3) Systemic conduction and contact-killing comprehensive herbicides: It has the dual functions of systemic conduction and contact-killing, such as chlorpyridine, etc.
Herbicide classification:
Herbicides can be classified according to mode of action, application site, source of compounds, etc. According to the action characteristics of herbicides, they are usually divided into two categories: pre-emergence herbicides and post-emergence herbicides.
Pre-emergent herbicides are also called soil treatment herbicides. This type of herbicide can only be used before or during the emergence of weeds. If used after the emergence of weeds, it will be basically ineffective against weeds. In the production of green leafy vegetables, soil spraying is generally carried out before planting of green leafy vegetables, after sowing and before emergence (post-sowing and pre-emergence), or during the growth period of green leafy vegetables and when weeds are in the germination stage.
Pendimethalin, napropamide, etc. are all pre-emergent herbicides. Post-emergence herbicides Post-emergence herbicides are also called stem and leaf treatment herbicides. This type of herbicide is usually used during the vigorous vegetative growth period after weed emergence, and is basically ineffective against weeds that have not yet germinated in the soil. In the production of green leafy vegetables, stems and leaves are generally sprayed during the growth period of green leafy vegetables. Fluroxyfop, Bentazone, etc. ?
Reference for the above content: Baidu Encyclopedia-Herbicides