What kind of weeding methods are generally used to eliminate weed damage?

In the field, the least is the shadow of weeds, in wheat, corn, paddy fields, sorghum and other planting areas, if weeds multiply in large quantities, it will also greatly affect the yield of these common crops, do a good job in wheat, corn, paddy fields, sorghum and other crop planting areas weeding work is the key link to improve the yield of wheat and other food crops. There are many kinds of weeds in the field and the density is large, and the main species are: Chenopodaceae weeds (gray stripes), wild oats, dogtail grass, spiny weed, purple stem Zeland, flat storage, letive cabbage, curly stems, rice crocks, bowl flowers, horsetails, etc.

There are usually two types of weeding: manual weeding and chemical weeding

1.When manual weeding is carried out, after the emergence of crops such as wheat, corn, rice field, sorghum, etc., combined with the method of loosening the soil, it can not only carry out weeding, but also break the soil compaction, improve the aeration of the soil, increase the activity of microorganisms, promote the release of effective nutrients in the soil, reduce the evaporation between trees, promote the development of the root system, and reduce the damage of weeds.

2.The use of chemical weeding is indeed a very good choice in modern agricultural production. Because chemical weeding is not only highly efficient, but most importantly, its weeding effect is extremely superior.

However, the 2,4 d butyl ester of the chemical herbicide was prone to drift and lead to pesticide damage, and the degree of pesticide damage increased with the increase of temperature. Generally, broad-leaved crops are susceptible to migration hazards, and sensitive plants include soybeans, sugar beets, tobacco, potatoes, flax, cotton, broad beans, peas, sprouts, sunflowers, herbaceous habitats, sweet potatoes, watermelons, pumpkins, zucchini, coriander, carrots, turnips, onions, garlic, tomatoes, eggplants, peppers, cucumbers, fruit trees, broad-leaved forest shrubs and other crops.

In the planting process of wheat, corn, paddy field, sorghum and other crops, the following points should be paid attention to when carrying out chemical weeding in the field: (1) the time of medication. In recent years, the irrigation time of wheat, corn, paddy fields, sorghum and other areas is about 1 week earlier than in previous years, so the chemical weeds in the field should be appropriately advanced.

The best time for weeding in the Yellow River irrigation area is from late April to early May. (2) The dosage of the drug. When taking medication, the dosage of the drug should be effectively controlled according to the type of weeds, the number of weeds, the height of seedlings and other factors.

It can be done by manual weeding, or herbicides can be used, and it is necessary to choose the right agent according to the growth of crops, and pay attention to quality and composition.

Manual weeding, mechanical weeding, herbicides, paraquat, these are all common methods of weeding, and the results are good.

Manual weeding, pesticide weeding, chemical weeding, using some animals for weeding, ducks can be used, fish can be used.

Grass damage can be eliminated by chemical means, for example, you can choose to spray some herbicides in the roots, so that the effect is faster.

How to use herbicides correctly and what should I pay attention to? Let me tell you about it

Expensive herbicides are not necessarily the most practical, and the most suitable herbicides should be selected according to the local grass phase, so that good weeding results can be achieved.

Strictly grasp the dosage of herbicides: the highly recommended dosage of each herbicide is the result of many years of practical activities and various experiments, and it is never allowed to increase and decrease the dosage at will, so as to ensure the effect of herbicides, and it is not easy to produce fertilizer damage, otherwise very reliable herbicides will also cause fertilizer damage.

Spray at the best time: The herbicide is used in 3 stages: one is the pre-planting soil solution, the second is the post-sowing pre-seedling soil solution, and the third is the leaf stem solution.

Post-sowing and pre-emergence solutions, also known as pre-bud solutions, are the application of herbicides after the seeds of grain crops are planted and before they emerge. This stage is relatively short, only a few days, and it is necessary to strictly grasp and apply herbicides before seedlings according to the situation. After sowing, the soil before seedlings is solved, and the effect of chemical control of weeds is good, but if the spraying is not immediate, it will harm the germination and erection of the fertilizer.

Pay attention to the temperature at the time of spraying: temperature is a major factor that can harm the growth and development of weeds and the effectiveness of herbicides. Generally, when the temperature is high, it is beneficial to give full play to the herbicide's medicinal power, and the herbicide effect is not good.

Pay attention to soil characteristics: soil characteristics are very harmful to herbicide power, soil with high organic matter content, good soil colloid, large amount of herbicide absorption, large number of soil microbial strains, abundant activity content, herbicides are easy to be dissolved, the same amount of use is safe for food crops, but the hoeing effect is poor, so it is necessary to increase the dosage moderately.

Climatic elements: Concerned about the hazards of wind, rain, environmental humidity, drought, temperature, sunshine and other temperature factors.

Sunlight and spring exposure: paraquat, herbicides, hail farmers, etc. are all photoactivating herbicides, which can kill weeds under the effect of light. The photosynthesis retardants of plants such as simazine, diuron, and prometrion can also inhibit the photosynthesis of weeds and plants under bright conditions and give full play to the effect of hoeing.

Fluorinin is easy to volatilize when applied to the surface of the soil, and it is easy to dissolve when it sees light, so it should be mixed with the surface soil immediately when applied.

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How do you do the right weeding? Herbicides can be used. It is absorbed from the roots or sprouting buds of the plant and must be applied to the soil before weeds appear.

Some herbicides are mainly absorbed from the aboveground part of the plant and must be sprayed on emerging weeds. Some herbicides lose their activity in the soil due to adsorption or rapid degradation, while others are more stable in the soil and remain active for a long time. Therefore, the herbicidal effect of herbicides largely depends on the characteristics of the herbicide and the technology used.

Spray herbicide is to use high-pressure spraying equipment to spray directly on the leaf surface of crops, and the liquid can penetrate into the leaves of crops, making the leaves yellow, so as to prevent the pesticides on the leaves from evaporating to the ground and prevent and control ground diseases and pests; When using the solution, there is no need to rinse the seeds with water. Spray herbicides can be mixed with some herbicides. When spraying herbicides, if you accidentally splash ** or eyes, you should immediately rinse with water to prevent the agent from failing.

3 5 seconds after spraying, you can achieve a better weeding effect. If it is in a high temperature and arid area, it should be sprayed in time to replenish water and maintain the temperature of the solution.

Spraying should be avoided after rain to avoid the loss of the solution. When applying pesticides, when the soil moisture is 60% or 70%, the herbs should be poured out and washed with water. After application, the residual liquid should be discharged in time to avoid polluting the environment again.

If overgrown weeds are found, appropriate measures should be taken to control them and prevent the weeds from reproducing. When spraying herbicides, avoid doing it after rain.

When weeding, the soil and weeds are generally washed with water first, and then the herbicide is evenly sprayed to all parts of the farmland, so that the liquid medicine enters all parts of the farmland evenly. In order to prevent the liquid medicine from volatilizing into the air, you can use a brush or palm to lightly wipe the agent, wipe the agent evenly, spray it on the weeds, and spray the liquid medicine evenly on the leaves of the weeds. Do not pour the liquid medicine into ditches or paddy fields, otherwise it will easily splash on the weeds in the farmland.

In addition to the above methods to use herbicides correctly, there are also strict requirements for the toxicity of herbicides.

We can directly buy some herbicides, and then mix these herbicides according to a certain ratio, and then spray them on some crops to carry out weeding work.

You can mix the herbicide with water first, then put it in a watering can and spray it on the roots of the weeds, which is the correct weeding step.

You can use spray herbicides, spraying pesticides directly on the liquid surface of crops, which can achieve good results.

At this time, you can choose the method of manual weeding, you can also choose to use herbicides, and you should also choose the right pharmacy according to the crop.

At present, the only BAI biological herbicide DU registered in China is dipropylphosate.

Zhi class, registered property.

DAO product is a 20% dipropylphosate soluble powder to control weeds in citrus orchards and rubber plantations. Dipropylphosate is a non-selective systemic delivery guide herbicide, which is effective against monocotyledonous weeds and perennial weeds, which was discovered from the fermentation broth of Streptomyces and later prepared by biological fermentation method. It acts faster than glyphosate, slower than paraquat, and is less toxic to mammals and can be quickly decomposed by soil microorganisms.

Dipropylphosate itself has no herbicidal activity, and its mechanism of action is that dipropylphosate is metabolized into glufosinate-ammonium in plants, and glufosinate-ammonium inhibits plant photosynthesis and leads to plant death.

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.

Will this year's spraying of licorice phosphorus have an impact on crop growth in the coming year?

The duration of herbicide use should be strictly controlled. Because the improper use time will make the herbicide coincide with the sensitive period of the crop, which can easily cause harm, such as rice to be weeded before sowing, because the drug will not directly contact the seedlings, can avoid or reduce the harm.

Strictly control the dosage used. The dosage requirements of herbicides are very strict, the dosage is small, and the effect is not good; The use of large doses is easy to cause drug harm. Therefore, during use, it should be carried out in accordance with the instructions or under the guidance of a technician.

Choose the right way to use it, if you don't use it properly, it can sometimes cause harm. If a large amount of liquid spraying is carried out when using soil treatment agents, if the amount of liquid spraying cannot meet the requirements, it is easy to produce drug hazards. If herbicides are not mixed properly with other agents, they are also prone to drug hazards.

Due to the limited resistance of lawns in different periods, the dosage should be controlled strictly according to the instructions for use. If you blindly increase the dosage and spray amount, it is easy to cause drug damage, leading to the normal detoxification and death of the lawn.

We should choose the right way to use it. When spraying with stem and leaf herbicides, the concentration of the ratio is very important. This ratio cannot be calculated simply in terms of dosage per square meter.

It must be added with water in strict accordance with the specified concentration ratio and sprayed evenly so that the leaves are moist and free of flowing liquid.

I don't think herbicides can be used indiscriminately, and the amount of spraying is crucial to ensure that the herbicide kills weeds without damaging the lawn. It is strictly forbidden to spray in large doses, so that the liquid cannot adhere to the surface of the blade and form leaf runoff. Not only is the weeding effect poor, but it is also easy for the liquid medicine to flow into the growth point of the lawn, resulting in the normal detoxification of the lawn.

Temperature directly affects the efficacy of herbicides, generally speaking, when the average temperature of the day is above 10 degrees, the use effect is better, and the weeding performance is slower under low temperature conditions. All herbicides should be applied on sunny, warmer days (summer temperatures over 38 degrees, avoid hot midday) to fully exert their effectiveness.