What are the types of herbicides, and the main types of herbicides

According to the type, mode of action, use, chemistry, mechanism of action of herbicides, etc., there are 5 types.

1. According to the conduction of herbicides in plants, herbicides contact herbicides (killing weeds and the contact part of the agent can play a local killing role and can conduct paraquat, etc.), systemic conductive herbicides (the agent can be transmitted through the contact site with weeds, causing the death of the whole plant, glyphosate, etc.), contact killing, systemic conduction comprehensive herbicides (with contact killing, systemic conduction, dual functions of herbicide, etc.).

2. According to the herbicide, selective herbicides (killing weeds, seedlings, damaging grass cover, etc.), herbicides (called non-selective herbicides, plant toxicity, seedlings, weeds, toxin, glyphosate, etc.).

3. According to herbicide application, herbicides, stem and leaf treatment agent (direct spraying of plant stems and leaves, glyphosate, etc.) according to herbicide, soil treatment agent (direct spraying of soil surface prometrinet in solution form, etc.), stem and leaf, soil dual treatment agent (both stem and leaf treatment, soil treatment, atrazine, etc.).

4. According to herbicides, organic herbicides (including carbon compounds, copper sulfate, etc.) and organic herbicides (mainly composed of alcohol, benzene, fatty acids, organic amines, organic phosphorus and other organic compounds, prochlor, glyphosate, etc.).

5. According to the mechanism of action of herbicides, herbicide regulators (24-d, etc.), photosynthesis inhibitors (paraquat, etc.), amino acid compound inhibitors (glyphosate, etc.), fatty acid compound inhibitors (propanil), cell cleavage inhibitors (flulelin, etc.).

1) Classification according to the method of herbicide use.

Stem and leaf treatment agent.

It is to spray herbicides on weed leaves or whole plants, such as glyphosate, paraquat, steady killing, and napping. These herbicides can be used in non-arable land as well as during the growing period of crops.

Soil treatment agents.

This type of herbicide is sprayed on the soil surface, sealing the soil and forming a liquid layer, which is inhibited or killed when the germinated seeds, seedlings, and young roots come into contact with or absorb the herbicide, such as flulenin, lasso, acetochlor, etc.

Stems and leaves and soil treatment agent.

This kind of herbicide can be used as both soil treatment agent and stem and leaf treatment agent, such as herbicide ether, atrazine, ligulon, etc.

2) Classification according to the mode of action of herbicides.

Contact herbicides.

This kind of herbicide only has a local killing effect, the plant is partially affected by contact, and the untouched part is not affected, and the agent cannot be conducted in the body. Such as herbicide ether and sodium pentachlorophenol.

Systemic conductive herbicides.

This kind of herbicide can be absorbed by plants, through roots, stems, leaves, buds, sheaths and other parts of the absorption in the body, herbicides through roots, shoots, etc., along the transpiration flow to the aboveground part of the conduction, some herbicides are absorbed by the stems and leaves along the sieve tube and photosynthesis products together with the underground part, such as triazine, substituted urea herbicides.

3) Classification according to herbicide use.

Selective herbicides.

This kind of herbicide has different selectivity between weeds and crops under certain conditions and dosages, that is, to protect crops and eliminate weeds, and most organic herbicides are selective, such as dilometre, weeding, durium, etc.

Herbicides.

This type of herbicide is not selective for weeds and crops, and can both kill weeds and harm crops, and most inorganic herbicides are biocidal herbicides.

Selectivity and non-selectivity are relative, not absolute, and can vary under certain conditions. If the dosage is increased or the method of use is changed, the selectivity can become extinction.

4) Classification according to herbicide**.

Inorganic herbicides.

Mainly in natural minerals, such as sodium arsenite, mineral oil emulsion. These herbicides are used in large quantities and have poor selectivity, and are rarely used at present.

Synthetic organic herbicides.

This kind of herbicide is currently the most varied, the largest amount of use, the widest range of applications, is the best weeding effect, the fastest development of a class of herbicides.

Microbial herbicides.

This is a class of herbicides made from living microorganisms or metabolites, such as Lubao No. 1.

Plant-based herbicides.

This kind of herbicide is the use of plant body leachate or metabolites to control or inhibit the growth of other weeds, some are called xenogram biomass, such as cinnamic acid derivatives coumarin, phenolic acid, etc.

5) Classification by chemical structure.

According to the classification of chemical structure, it mainly refers to organic synthetic herbicides, with incomplete statistics There are nearly 20 categories, including amides, anilines, substituted ureas, phenoxy, benzoic acid, carbamates, diphenyl ethers, triazine benzenes, organophosphorus, heterocyclic groups, etc.

Corn can be used before the sprout. Second. Herbicides of weedium or acetochlor should be sprayed in the soil before the seedlings after corn sowing, and the specific dosage can be used under the guidance of the dealer in combination with the local dosage.

After weeding in corn seedlings, in the 3-5 leaf stage of corn, you can choose nicosulfuron, nicodisulfuron, atrazine, atrazine, bract spray control.

Prevention and control notes that pre-seeding and post-sowing agents can be considered as blocking potions. However, the use of herbicides must depend on what kind of crops you want to plant, so that you can choose the right herbicide more effectively.

Herbicides are agents that cause weeds to die completely or selectively. Among them, sodium chlorate, borax, arsenite, and trichloroacetic acid have a dead effect on any kind of plants, but because these have residual effects, they cannot be used in the field. Most of the selective herbicides, especially nitrophenol, chlorophenol, and carbamate derivatives, are effective.

The development of herbicides in the world has gradually stabilized, mainly developing varieties with high efficiency, low toxicity, broad spectrum and low dosage, and disposable treatment agents with little environmental pollution have gradually become the mainstream.

Herbicides can be classified according to the mode of action, application site, compound** and other aspects.

1.Classified according to mode of action.

1) Selective herbicides:

Herbicides have different levels of resistance to different types of seedlings, and this herbicide can kill weeds without harming seedlings. Such as Gaicaoneng, Fluorin, Pycaojing, Simazine, Guoer, etc.

2) Herbicides:

Herbicides are toxic to all plants and can be damaged or killed by anyone who comes into contact with the green part, regardless of seedlings and weeds. It is mainly used before sowing, before sowing and before emergence, and on the main and secondary roads of the nursery. Such as glyphosate, etc.

2.Herbicides are classified according to their movement through the plant.

1) Contact herbicides:

When the agent comes into contact with weeds, it only kills the part that comes into contact with the agent, which has a local killing effect and cannot be conducted in the plant. It can only kill the aboveground part of the weed, and the effect is less effective on the underground part of the weed or perennial deep-rooted weed with underground stems. Such as herbicidal ether, paraquat, etc.

2) Systemic conductive herbicides:

After being absorbed by the root system or leaves, bud sheaths or stems, the agent is transmitted to the plant and dies. Such as glyphosate, prometrinet, etc.

3) Systemic conduction, contact killing comprehensive herbicide:

It has the dual functions of systemic conduction and contact killing, such as chloricidal, etc.

3. Classification according to chemical structure.

1) Inorganic compound herbicides:

It is composed of natural mineral raw materials and does not contain carbon-containing compounds, such as potassium chlorate, copper sulfate, etc.

2) Organic compound herbicides:

It is mainly synthesized from organic compounds such as benzene, alcohols, fatty acids, and organic amines. Such as ethers - gol, triazine benzene - prometriazine, substituted urea - herbicide No. 1, phenoxyacetic acid - 2 methyl 4 chloro, pyridine - capitonol, dinitroaniline - fluorin, amides - Lasso, organophosphates - glyphosate, phenols - sodium pentachlorophenol, etc.

4. Classification according to the method of use.

1) Stem and leaf treatment agent:

The herbicide solution is mixed with water and evenly sprayed on the plant with fine droplets, and the herbicide used in this spraying method is called stem and leaf treatment agent, such as cover grass energy, glyphosate, etc.

2) Soil treatment agent:

The herbicide is evenly sprayed on the soil in a certain thickness of the medicine layer, when the young shoots, seedlings and roots of weed seeds are exposed and absorbed and play a role in killing herbicides, this effect of herbicides, called soil treatment agents, such as simazine, promethonyl, fluorin, etc., can be applied by spraying, watering, and poisonous soil method.

3) Stems and leaves, soil treatment agents:

It can be used for stem and leaf treatment, and can also be used for soil treatment, such as atrazine.

Classified according to mode of action: selective herbicides, biocidal herbicides, and contact herbicides. Herbicides are classified according to their movement through the plant.

Conductive herbicides, systemic conductive herbicides. Classified according to chemical structure: inorganic compound herbicides, organic compound herbicides.

Herbicides refer to agents that can cause weeds to die completely or selectively, also known as herbicides, to eliminate or inhibit the growth of plants.

In the process of planting in farmland, weeds are plants that follow each other, and their presence will compete for the nutrient absorption of crops, so many farmers use weed herbicides in wheat fields for weed control. The herbicide has super penetrating power, which can make the active ingredients of the herbicide quickly penetrate the soil layer and completely remove all kinds of weeds. Herbicides with different ingredients have different effects, and the choice of herbicides must be based on the needs of crops.

The commonly used varieties are organic compounds, which can be widely used to control weeds, shrubs, trees and other harmful plants in farmland, orchards, flower nurseries, grasslands and non-arable land, railway lines, rivers, reservoirs, warehouses and other places.

The main dosage forms of herbicides are: aqueous solvents; WPs; Ec; Granules.

The impact of selective herbicides on crops is very small, it can selectively treat those weeds, we can not only ensure the healthy growth of crops, but also ensure that those weeds are disposed of.

In our daily lives, the growth of Dragon Ball. It's what we care about, because people live on food. There are vegetables or other crops, the healthy growth of crops depends on the careful care of farmers, or the rational use of pesticides, fertilizers and other related things.

Therefore, with the rational use of weeders or other pesticides, we can get healthy vegetables. First of all, we can classify the herbicides according to the mode of action and type of herbicides, and this kind of herbicides can be divided into contact herbicides. or systemic conductive herbicides.

The first is that this herbicide has always had a local killing effect, and if the plant comes into contact with this herbicide, it will be affected to a certain extent, while the second herbicide can be absorbed by the plant and then conducted in the plant and finally transmitted to the land.

Although we all want to eat green, healthy, and pollution-free food, the use of pesticides is a must. However, how to use pesticides and herbicides correctly requires certain methods and professional personnel to guide, so farmers must choose the right pesticides and herbicides to eliminate pesticides when planting crops.

Amides, organophosphates, benzoic acids, triazine, anilines, etc., are classified according to their chemical structure, and such criteria are quite accurate.

The types of herbicides are: stem and leaf treatment agent, stem and leaf and soil treatment agent, soil treatment agent, contact herbicide, and systemic conductive herbicide.

It mainly includes the selection type of herbicide, and there is also the non-selection type of herbicide, and it will also be divided into trigger type herbicide according to the type of plant, and there is also a conduction type of herbicide.

Agricultural products have moved from scarcity to prosperity. Although a variety of herbicides add certain difficulties to the selection of agricultural products, to a certain extent, the specific content is selected in a variety of ways. Make chemical weeding more selective.

Although there are many types of herbicides, as long as you understand the basic knowledge of herbicides, you will have a pair of discerning eyes, no matter how the secret recipe of its composition changes, it is inseparable from its origin. The key types of wheat herbicides are:

Bensulfuron, benzsulfuron, ethoxyfluorfen, thiensulfuron, chlorofluoropyroxyacetic acid, azolone, pyridoxam, diflusulfam, dimethyltetrachloride, ditetrachlor, ditetrabutyl, these. The types of bramide herbicides are: acetochlor, alachlor, butachlor, metolachlor, and alachlor; The types of triazine herbicides are:

atrazine, cyanoxazine, simazine, and phimazine; Phenoxycarboxylic acid herbicides: key for the prevention of broadleaf weeds and aconite after maize emergence. The symbolic species are 2-methyl-4-chloroacetate, 2,4-d butyl ester, etc.

Herbicides are selected according to crops and weeds at different growing seasons. The herbicide application stage can be divided into pre-sowing soil treatment, post-sowing pre-seedling soil treatment and post-seedling leaf and stem solution, and the appropriate herbicide should be selected according to the spraying stage. For example, prochlor can be used for pre-seedling closure treatment of paddy field, and post-seedling leaf stem modifiers are:

Bisoxalin, cyanofluoxate, ammonium dichloroquine sulfate, sodium dimethyltetrachloride, pyropter, etc. There are many types of herbicides, and there are also many types of weeds. It depends on what your key chemical control is weeds, and there are also pre-seedling or post-seedling chemical control.

It is a paddy field, a dry field or a barren mountain hoeing grass to choose the corresponding herbicide. Glyphosate is a systemic herbicide, which is digested and absorbed by green plant leaves and reaches all parts of the plant, and then harms the amino acid metabolism of plants, thereby causing protein synthesis to be blocked, and then killing green plants.