At present, there are many kinds of herbicides. According to the method of use, herbicides are divided into stem and leaf treatment agents and soil sealing treatment agents; they are divided into selective and inborn forms according to their mode of action; and they are divided into contact herbicides according to their conductivity in plants. Conducting herbicides; According to the chemical composition is divided into sulfonamide herbicides and malic herbicides and so on.
Practice has proved that different types of herbicides are used in different ways. If they are used improperly, they are not only ineffective, but also waste medicines and even cause phytotoxicity.
Stem and leaf herbicides: After the emergence of weeds, pesticides that are applied directly to weed stems and leaves to kill weeds are called stem and leaf herbicides, such as glyphosate, 2.4D butyl ester, paraquat, Bendason, etc. Stem and leaf treatment, that is, the herbicide diluted in a certain amount of water, spraying weed seedlings, weeds stems and leaves through the absorption and conduction of drugs to eliminate weeds. The control effect of stem and leaf treatment agent has a great relationship with temperature, light, and the wetting state of the herbicide on the surface of the plant body.
Soil sealing treatment agent: that is, weeding herbicide on the surface of the soil or mixing the herbicide into the soil through the operation of mixing soil to establish a closed layer of herbicide to kill germinating weeds. Such herbicides can be absorbed by the roots, the coleoptiles, or the hypocotyls of weeds and the like. For example, isoproturon, acetochlor, and chlorotoluron belong to this category. According to the application time, these herbicides can be divided into two kinds, pre-planting and post-planting. The former refers to the closed treatment of the soil before flower seedlings sowing, so as to absorb the young roots and young shoots of weeds, and prevent or reduce the volatilization and photolysis loss of herbicides. The latter is used for soil treatment before emergence after seeding. This method is mainly used for herbicides that are easily absorbed by weeds and young weeds, and is safe and harmless to young shoots.
Selective herbicides: Herbicides that kill weeds without damaging crops are called selective herbicides. This herbicide sometimes kills only one or some of the idyllic weeds in the pastoral nursery. Artificially planted plants have less influence. If the grass can be applied to the nursery, it can only kill the monocotyledonous weeds that are mainly aphrodisiac, without damaging the seedling plants. Dole, fine stable kill can be applied in the weed seedling stage, as long as the concentration is appropriate, relatively safe for seedlings and other crops. Of course, the selectivity of herbicides is relative. Selective herbicides can also be used as non-selective herbicides in case of changes in dosage, application period and application method; non-selective herbicides can also be used.
"Time difference selection" and "position difference selection" are safely used during the growth period of seedling crops.
Inheriting herbicides: Inactivated herbicides, also known as non-selective herbicides, are non-selective to plant damage and are not divided by grass seedlings and can kill weeds and crops at the same time. Glyphosate, Gramoxone, Farmers' Fun, etc. belong to this category. Such herbicides are mostly used in cash crops such as tea mulberry, orchard, coffee, and rubber to control weeds. Glyphosate and Gram-negative broad-spectrum herbicides can rapidly destroy the green tissues of plants, and have no killing effect on the trunk and stem of non-green parts. Farmers' music is newly developed and has no residue. It can be used directly in ponds, lakes, etc. to prevent all kinds of weeds and wet weeds. Used in various orchards, mulberry gardens, tea gardens, etc., and can be used for industrial and mining areas, warehouses, highways and urban and rural areas of environmental sanitation weeding. It can also be used to remove non-appreciating weeds from lawns and garden landscapes. Contact killing herbicides: When these herbicides come in contact with plants, they are difficult to conduct in the plant or have poor mobility. They are limited to damage to the parts of the drug that are in contact. This local contact killing is caused by the death of weeds, such as herbicide ether, paraquat, propadiene, etc., which are contact killing herbicides. The application of herbicides of this type should be uniform, and the control of perennial perennial weeds must be repeated before they can be killed.
Conducting herbicides: These herbicides can be absorbed by the plant's roots, stems, leaves, buds and sheaths, and can be conducted in the body of plants. Therefore, conductive herbicides are also known as systemic herbicides, such as grasses. Glyphosate,
Such herbicides as 2.4-D, dimethyl tetrachlorine, and green yellow longum belong to this category. Glyphosate is able to weed because the liquid is absorbed from the leaves and then transferred to the roots, causing the weeds to slowly die.
If the leaves of the weeds are cut off, the liquid medicine cannot be fully absorbed and the weeding effect will be poor. The function of herbicides is closely related to their components. Classification based on the chemical composition of herbicides is currently the most commonly used method. Usually can be divided into phenoxy carboxylic acids, such as dimethyl tetrachloric acid; phenoxy and heterocyclic epoxy phenoxy propionic acid, such as Gaishoneng, madder spirit, steady kill, etc.; substituted urea class such as green Mellon, diuron, isoproturon, etc.; sulfonylureas are superstars, etc.; urethanes are oats, etc.; organophosphorus is glyphosate; triazines are simazine. Prawn net, atrazine and so on.
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