Clomazone, trade name Command, is an organic heterocyclic oxazolidine pre- emergence herbicide developed by Fumei Shi. It is a superior herbicide variety listed in 1986. It is mainly used. It is used to control annual grass weeds and broadleaf weeds in crop fields such as soybean, rapeseed, peanut and corn. And many different categories: amino acids (such as glyphosate), bipyridines (such as paraquat), phenoxycarboxylic acids (such as 2,4-D), HPPD (such as mesotrione), acetamides (such as metolachlor), amino acids (such as glufosinate), triazines (such as atrazine), other classes (such as oxazolin), dinitroanilines (such as pendimethalin) Compared with other PPO species (such as propifluramide) and other major brands of herbicides, the genus of the genus of the genus genus is not a conspicuous species, but it is a broad spectrum of herbicides, high activity and market. Large and excellent herbicides have maintained a steady upward trend in the global herbicide sales market.
Mechanism and characteristics
1.1 Mechanism of action
Isoflavone is mainly used to control annual grass weeds and broadleaf weeds. It can be used as a pre-emergence herbicide or as a post-emergence herbicide. It is a photosynthesis inhibitor. The photosynthesis of weeds is mainly inhibited by: 1 inhibiting the formation of chloroplasts and the integrity of developmental structures; 2 inhibiting the photoreaction of light energy into chemical energy; 3 inhibiting the biosynthesis of photosynthesis products.
The pre-emergence of E. sinensis can be absorbed by weed roots and shoots, and is transmitted upwards to various parts of the plant with transpiration. After the agent is absorbed, it can inhibit the synthesis of biguanides (isoprene) compounds of sensitive plants, hindering The biosynthesis of carotene and chlorophyll causes chlorosis and whitening of the leaves, causing the weeds to die in a short period of time; even if the seeds of the absorbing agent can be germinated and unearthed, they will die in a short period of time due to no pigmentation. Post-emergence use can be absorbed by weed stems and leaves, poor conductivity, inhibit the synthesis of sensitive plant chlorophyll and carotene, whitening stems and leaves to kill weeds.
The biological activity of E. sinensis in soil can last for more than 6 months, indicating that the drug has a long residual effect period. Therefore, it is not suitable to plant crops such as wheat, barley, oats, rye, millet, etc. in the fall of the application (4 to 5 months after application) or spring (ie, 6 to 10 months after application). Rice, corn, cotton, peanuts and sunflowers can be grown in the spring of the next year after the application of the dioxin. It is selective for crops such as soybean, sugar cane, potato, peanut and tobacco. After the crop is absorbed, it undergoes special metabolism to transform the dysentery into a non-toxic degradant.
Isoflavone has a high vapor pressure and will volatilize from the surface of the soil after application. It harms other non-target plants. If it is used improperly, it can damage crops such as grapes, tomatoes, peppers, etc. by volatilization. . Therefore, the dioxin can only be applied in small winds to minimize drift.
1.2 Features
(1) The herbicidal spectrum is broad and the activity is high. Isoflavone can be used in soybean, rice, rape, cotton, cassava, sugar cane and tobacco fields, controlling weeds, foxtail, crabgrass, goosegrass, purslane, alfalfa, comfrey, nightshade, cocklebur, Annual grass weeds and broadleaf weeds such as ragweed. It also has a strong inhibitory effect on thorny vegetables, big cockroaches, chicory, and wattle. At present, it is believed that the dysentery is one of the best agents for controlling the "three dishes" (orchis, chicory, and thorns).
(2) The long-term effect period. Generally, the drug can maintain the whole growth period of the crop and can exert good effects under drought and low temperature conditions.
(3) The medication time is more flexible. It can be used for pre-emergence and pre-planting closure treatment, as well as post-emergence stem and leaf treatment.
(4) Low toxicity. It is safe and environmentally friendly to crops and people, livestock and aquatic life.
(5) Strong compatibility. There are many varieties of herbicides that can be mixed, so there are many compound products, which are easy to use and have high efficacy.
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