What are the types of herbicide damages? What s the best herbicide?

Herbicide damage refers to a series of abnormal phenomena caused by the inappropriate application of herbicides and the stunting of the normal physiological function or growth and development of crops. Acute drug damage has obvious symptoms in a few hours to 3 4 days after spraying, and it develops rapidly, such as burns, perforations, wilting, falling leaves, falling flowers, falling fruits, etc. Chronic pesticide damage caused obvious reactions after spraying for a long time, showing poor growth, leaf deformity, greening and yellowing, delayed ripening, poor flavor, and dissatisfied grains.

Herbicides can be divided into different categories according to different methods of weeding. Generally, it can be divided into incidal and selective herbicides according to the nature of action; According to the mode of action, it is divided into systemic and contact herbicides; According to the application object, it is divided into soil treatment and stem and leaf treatment agent; According to the application time, it can be divided into pre-sowing treatment agent, post-sowing pre-seedling soil treatment agent and post-seedling treatment agent. According to the chemical structure, it is roughly divided into phenols, phenoxycarboxylic acids, benzoic acids, diphenyl ethers, bipyridines, carbamates, thiocarbamates, amides, triazine, substituted ureas, triazine, dinitroaniline, organophosphorus, aryloxyphenoxypropionate, sulfonamides, sulfonylureas, cyclohexenone, imidazolinones and other heterocyclic groups.

There are many kinds of pesticide damage caused by herbicides to crops, and there can be several kinds of pesticide damage according to different classification methods. The classification methods can be divided according to the occurrence period of different drug damage, according to the nature of the symptoms of the drug damage, and according to the mechanism of action of herbicides.

The most powerful herbicide: Proud Kill, an industrial herbicide variety.

It is a systemic conductive herbicide, which is absorbed through the roots, stems and leaves of weeds, and then conducts up and down in the weed's body, inhibiting its growth and eventually causing its roots to rot and cause weed death. After about 3 5 days of application, the weed stems and leaves will produce a pesticide reaction, and the weeds will die about 20 days after spraying. Pride has a strong closed germination effect on weed seeds, which ensures the outstanding advantages of long duration of Pride kill.

It is an excellent herbicide used in non-arable land such as railways, highways, stations, and reservoir areas. It is different from traditional non-arable land herbicides such as grass irrigation and forest grass cleaning, the above two herbicides are single-component herbicide products with "methylsulfuron" as the ingredient.

The Pyrox is a new ternary compound formula herbicide for areas with serious resistance (to metsulfuron), which is a generation of compound formula herbicides that solves the problem of resistant weeds.

In addition, according to the environmental characteristics of "arid compaction, saline-alkaline and sandy soil" at the highway weeding site, the concentrated suspension dosage form of adsorbent, penetrant and spreader and other additives has been increased, because Aosha has the outstanding advantages of long-term weeding and strong adsorption with soil, so it has greatly improved the safety of use on the basis of ensuring the weeding effect.

It is an excellent herbicide for weeding in non-arable land such as railways, highways, stations, and reservoir areas.

Herbicides are divided into agricultural herbicides and industrial herbicides, not to say which one is the most powerful, but to solve the problem in a targeted manner. First of all, agricultural herbicides need to remove weeds while not affecting the plants in the field, different herbicides target different plants, there are broad-leaved weeds, there are grasses weeds, which is powerful depends on what weeds you want to kill? What are crops?

Choose the ones that can kill the weeds to be killed and are harmless to the crops. It should be used after detailed consultation with a pesticide unit or agricultural material store.

Secondly, industrial herbicides should use herbicides, because industrial occasions need to completely kill the plants that are in the way, and the herbicides that need to be weeded are strong, can be weededs, and can not grow new grass for a long time, and do not need to spray herbicides frequently, so as to have a large-scale weeding, economic and labor-saving effect. The most widely used herbicide in the field of industrial herbicides is the railway sector, and the dosage is very large, and a herbicide called "arrogance" has been used on the railway for a long time, which is said to be the most effective.

In short, you can't simply say which herbicide is the most powerful, you should judge it according to specific occasions and needs, and don't just listen to the words of a business, learn some basic knowledge of weeding, and then consult the opinions of real users in related fields, understand more, compare more, and make objective evaluations and choices.

Some say that the most powerful herbicide at the moment is glyphosate. Of course, the weeding effect of glyphosate is undoubted, but glyphosate itself also has great shortcomings, such as shallow root crops can not be used, continuous use causes large residues in the soil, and some weeds are not effective (small flying peng, reed grass, cow tendon grass and duck toe grass, etc.), crop inter-row treatment is easy to produce pesticide damage, etc.

Glufosinate-ammonium and diquat are the two most promising alternatives to paraquat, but they have not been able to form the breadth of use of paraquat because of their lack of extensive and high herbicidal spectrum.

Therefore, in the post-paraquat era, it is unrealistic to simply expect any product to easily deal with weed hazards (including paraquat, which also has the short-term effect of weeding), and farmers should choose a reasonable mix when choosing herbicides, so as to achieve a cost-effective use of weeding.

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.

The production process of electricity is extremely complex, with multiple processes such as power generation, transmission, distribution, and consumption. Among them, power generation refers to the place where electric energy is produced, such as: thermal power units, hydropower units, etc.; Transmission refers to the operation of using high-voltage lines to complete power transmission; Substation refers to the use of high-voltage substation to convert high-voltage voltage, ultra-high-voltage voltage and other electrical energy into low-voltage electrical energy; Distribution is the final step, which reduces the voltage and delivers the electricity to the consumer.

The power transmission and transformation project of the power system attaches importance to the two steps of transmission and transformation. With the rapid increase in China's electricity demand, there is an urgent need for power system transmission and transformation projects to undertake the transmission and transmission of the power system. A number of power transmission and transformation projects together constitute the main frame of China's power grid.

At this stage, China's power transmission and transformation projects generally have multiple voltage levels such as 110kv, 220kv, 330kv, 500kv, etc., of which 220kv is used more frequently in China; 330kV is commonly found in China's northwest power grid; The 500kV level is the highest, and the requirements for cost, capacity, and process are higher and more advanced. At present, China attaches great importance to the construction of 500kV power grid, which is the backbone of China's power grid. Power transmission and transformation engineering is an important engineering project in the construction of the main grid of the power grid, including transmission line engineering and substation engineering, which requires high costs, extremely complex engineering construction, and high construction technical requirements.

Power transmission and transformation projects generally include electrical installation, communication and automation, civil engineering, electrical equipment commissioning, system start-up and commissioning, etc. Among them, electrical installation includes the installation of primary equipment such as high-voltage equipment, and also includes the wiring and installation of secondary equipment such as protection and control systems; Communication and automation refers to communication engineering and substation automation; Civil engineering covers equipment foundation, building engineering, four-way and one-level, frame foundation, etc.; The commissioning of electrical equipment is to test and adjust the installed primary equipment and secondary equipment; System start-up and commissioning refers to the start-up and commissioning of the operation of transmission lines and substations after the construction of power transmission and transformation projects. The status quo of power system power transmission and transformation project management does not pay attention to the coordination of the project scheduleThe power system power transmission and transformation project is very different from other projects, and the requirements of the power system power transmission and transformation project are higher, and the construction progress is required to be carried out in strict accordance with the specified requirements to ensure that the project construction is completed on time.

At this stage, most of China's power enterprises do not pay attention to the management and coordination of the progress of power transmission and transformation projects, which seriously affects the quality of the project, which not only reduces the ability of construction personnel and engineers to control the progress of the project, but also has a great impact on the efficiency and quality of the project. A small number of power transmission and transformation projects only pay attention to the progress of the project, and lack the supervision of the project quality, resulting in the problem of urban power shortage.

In the process of herbicide production and processing, due to the lack of strict control of a certain link, the harmful components exceed the standard or are not well mixed, and the application of this herbicide in rice fields can easily cause pesticide damage. Each herbicide has its own defined scope of use, duration and agent. Misuse, improper expiration date or excessive concentration may cause pesticide damage.

For example, the rapid barnyard is prone to pesticide damage when applied at the seedling stage of rice, and there are no symptoms of pesticide damage in the seedling field. Rice seedlings showed symptoms of pesticide damage after planting to the 7-leaf stage. Use 2-4 chloride in the bud, seedling and jointing stages of rice.

It is easy to cause drug damage. Due to the lack of understanding of the physicochemical properties of herbicides, improper mixing of herbicides is also a factor causing pesticide damage. For example, the mixing of trichlorfon and dimethoate can cause pesticide damage to rice.

Some herbicides do not show pesticide damage to current crops, and pesticide residues often harm the next crop. For example, the use of simazine in corn fields is very effective in controlling weeds. If rapeseed is sown in the next season, the seeds germinate slowly, and the root tip germination and other parts will brown or rot, which will have a great impact on the yield.

For example, spraying wheat grass nets will not cause pesticide damage, and when summer peanuts are planted in the next crop, the young roots will swell and rot, and the seedlings will gradually turn yellow and die, resulting in a serious reduction in yield. <

Hazards caused by improper use are more common. The use of herbicides requires the field to be leveled and kept in shallow water for a certain period of time after application. If the water layer submerges the heart leaf, it is easy to cause pesticide damage.

For example, throwing bottles is easy to produce drug damage. Pesticides are not applied scientifically according to environmental conditions such as climate. Environmental factors such as climate and soil will not only affect the efficacy of drugs, but also affect the occurrence of drug damage.

The main climatic factors affecting pesticide damage are temperature, humidity, rainfall, wind and light, among which temperature and light have the most obvious effects. Low temperature is prone to pesticide damage, observation is prone to pesticide damage, and soil with low organic matter content is prone to pesticide damage. <

It may be that too many herbicides are used, or the wrong herbicides are used, or the herbicides themselves have quality problems, and improper use methods will also lead to harm, so we must use herbicides scientifically.

1. The quality of herbicides is not good.

In the process of herbicide production and processing, due to the lax control of a certain link, the harmful components exceed the standard or are mixed unevenly, this herbicide is very easy to produce pesticide damage in paddy fields.

2. Misuse or improper use.

Each herbicide has its specified range, period and dosage, and misuse, improper use period or excessive concentration are prone to pesticide damage. For example, the application of fast barnyard in the rice seedling stage is easy to produce pesticide damage, the seedling field does not show the symptoms of pesticide damage, and the rice seedlings are inserted into the field to the 7-leaf stage. The use of 2-methyl4-chloride at the bud stage, seedling stage and jointing stage of rice is easy to produce pesticide damage.

This is usually caused by choosing the wrong type of herbicide, and choosing the wrong type of pesticide can damage crops.

Dizziness, nausea, muscle tremors, loss of orientation, loss of appetite, diarrhea, etc., may occur, these conditions, poisoning is severe, be sure to go for a checkup.

It causes problems with the growth of the plant, it leads to the situation of falling flowers and fruits, and the leaves and petals of the plant will curl and the leaves will become thicker.

The root system of the plant is underdeveloped, and there will be symptoms such as yellowing of leaves, distortion of leaves, uneven seedling planting, and then many bitter seedlings.

When the land encounters low temperature, the seeds grow slowly and cannot pass through the herbicide layer at the expected rate, which increases the contact time between the seeds and the herbicide, resulting in the size of the seedlings, the dead leaves of the powdered seeds, and the wrinkles. Some unsafe seed treatments inhibit the growth of seedlings, thus prolonging the time it takes to pass through the herbicide layer and cause harm. For example, low temperatures and rainy weather, such as tetrazole, can inhibit seed germination and growth, resulting in prolonged contact time between the growing site and the herbicide area, resulting in herbicide hazards.

The initial herbicide damage is localized or locally on the ground, but can be recovered by applying fast-acting fertilizers to supplement nutrients such as nitrogen. Herbicides are mostly acidic substances, which can be sprinkled with lime, grass ash, etc. to reduce harm. The mixture of organophosphorus pesticides and herbicides, the residual components in organophosphorus pesticides will affect the growth of plants and crops, resulting in necrosis or death of plant growth points or leaf sheaths, and seriously affect crop yield and quality.

Organophosphorus pesticides are highly toxic and have the greatest impact on humans and the atmosphere.

Therefore, we should reduce the use of organophosphorus pesticides and herbicides, and before use, organic acid treatment should be carried out to eliminate pesticide residues. Before the use of organophosphorus pesticides, organic liquid treatment can be carried out with a solution, such as soaking or spraying after soaking. Before the organophosphorus pesticide is used, immerse it in the solution around the roots of the crop for 20 minutes and 20 minutes.

When soaking, the liquid can be diluted to the desired concentration. Generally, after soaking for 2 hours, the liquid can reach the minimum amount of organophosphorus pesticide residues.

When the liquid reaches the required concentration, it can be sprayed. When spraying, the liquid medicine should be 1-3 cm away from the crop, the nozzle should be 30-50 cm away from the crop, the nozzle diameter should be larger, the spray amount should be sufficient, and the spraying time should be short. When the liquid reaches the required concentration, it can be prescribed for the case, or foliar spraying, the spray head should be more than 30 cm away from the crop, and the prevention and control of pesticide damage can be based on the actual situation, chemical methods, physical methods and biological methods can be used.

For example, it can be directly mixed in plant ash or lime, and then mixed with organic liquid, etc., to reduce the occurrence of pesticide damage.