What are the methods of using chemical herbicides in farmland?

Stem and leaf treatment. It is the spraying of medicinal herbicides directly on the leaves of growing weeds. The stem and leaf treatment methods can be divided into two types: stem and leaf treatment before sowing and stem and leaf treatment during the growth period.

Pre-sowing stem and leaf treatment: Before sowing or transplanting, spraying chemical herbicide solution on growing weeds can completely and effectively kill weeds. The requirements for this type of herbicide are broad-spectrum.

The effect period is short, and the agent decomposes quickly after falling into the soil. *Commonly used drugs include glyphosate, co-free and other chemical agents. Stem and leaf treatment during the growing period is a method of spraying herbicides to remove weeds from stems and leaves after crop emergence.

This treatment sprays herbicides on weeds and crops. Some herbicides that are not very selective can be sprayed by directional spraying to achieve the purpose of ensuring crop safety and weeding control. The herbicides used in the stem and leaf treatment method are generally emulsifiable concentrate, water agent, wettable powder, etc., which are sprayed on the water surface.

Oil-based agents can be sprayed directly with an ultra-low volume sprayer. <>

Soil treatment methods. It can be divided into three levels of soil treatment: pre-sowing, post-sowing, pre-seedling and post-seedling. Pre-planting soil treatment is to apply herbicides to the soil before transplanting or sowing crops and mix them evenly into the shallow soil layer to form a certain depth of the pesticide layer.

When weeds sprout or pass through layers of drugs, they come into contact with and absorb the drugs. Leads to poisoning and death. The advantage of this treatment method is that it can reduce the volatilization and photolysis of the herbicide.

In the case of poor surface moisture, the concrete treatment has higher efficacy and better weeding effect than the above treatments. Post-sowing and pre-emergence soil treatment: It is to carry out soil treatment after sowing and before emergence of crops.

Most of the herbicides used by farmers today are applied in this way. These agents are mainly used for weeding by "location selection". Post-emergence soil treatment refers to the treatment of soil during the growing period of crops, such as the use of cyclopropylene ether and fipronil in rice fields after seedling.

This herbicide is usually applied in the form of granules. Soil surface treatment: It is a method of treating soil before or after planting.

Weeding with weeding film. This method uses a film containing herbicides to kill weeds. The method is to drill holes in the mulch film according to the cultivation point of the crop, then cover the surface of the farmland, sow or plant in the hole, and the crop grows through the hole.

Because the film contains herbicides, weeds germinate against the film. and killed. This film can be used for weeding in the field of cotton, peanuts, vegetables and other crops.

Smear and spray. When the weeds are higher than the crop, apply a strong systemic herbicide to the weeds. The concentration of the drug should be increased when taking the drug.

When using herbicides, it must be diluted, and when spraying herbicides, the nozzle must be placed lower, so that it can be sprayed more evenly and can also achieve an optimal effect.

You can spray herbicides in the field, you can mix the herbicides and seeds evenly, and then plant them together, or you can water these herbicides on the roots of the fields, you can also cover the crops with a plastic film, or you can apply these chemical herbicides to the weeds so that you can also remove weeds.

When using, we must choose the right herbicide, and at the same time, we should choose a better effect, and we must pay attention to the appropriate concentration and dosage in the process of use, do not use too much at one time, we must do a good job of personal protection, avoid rainy or windy weather, choose to use it on sunny days, so as to avoid affecting the effect of herbicides.

Mix the herbicide with water, pour it into a watering can and finally spray it in the field so that the grass can be removed.

When there are many kinds of weeds in soybean fields, the formula should be selected. When applying herbicides, it is best to spray herbicides first to control weeds and weeds, and then apply chemical herbicides in the field. The main methods include leaf and stem treatment, soil treatment, herbicide film cleaning, etc.

Treatment of stems and leaves. Herbicides are sprayed directly on herbaceous plants in cultivation. When using herbicides, insist on "dense and not sparse" (Note:

refers to the dense amount of grass, not the age of the grass).

The best time to use herbicides for desertification is when most of the weeds in the fields are dug up. Petiole treatments must be sprayed with herbicides to control broadleaf weeds to ensure different plant varieties and growing periods. In general, it is best to choose a chemical herbicide with an appropriate duration to reduce the contamination of pesticide residues and damage to subsequent vegetables.

In addition, the special sensitivity of chemical herbicides to vegetables should be noted to demonstrate their normal efficacy. Then add water to the desired amount of water.

Usually, the water consumption is about 50-60kg, in addition to the treatment of the soil surface, it does not produce the type of chemical herbicide and its principle of action on plants, the influence of various factors on the spring erection of herbicides, and the technical requirements for use. Practice has proved that the chemical disintegration method is a modern wedding, bio-chemical abandonment and chemical disintegration method, in which chemical inequality is the use of herbicides for abandonment, chemical wedding has the advantages of good wedding effect, labor-saving, time-saving, economic, etc., in recent years, in China, chemical herbicides can not only effectively control the field weeds, but also will not cause harm to crops. As a result, they are consumed by most of the agricultural raw materials.

The use of mixed herbicides can be expanded. However, mixed herbicides must be used in the same way. Herbicides must be used in different crops that are highly selective.

In addition to special herbicides for corn fields, other herbicides. Spray weeds in the field, do not spray crops, and try to stain weeds with medicated solutions to reduce pollution to crops.

Chemical weeding in farmland, pay attention? In addition to field water and fertilizer management, attention should also be paid to removing weeds in the field to prevent weeds from competing with rice for nutrients, resulting in low yield and poor economic benefits. What are the chemical weeding methods and precautions for rice?

Let's find out! Chemical weeding is 1-2 days after sowing, if it is mechanical seeding, it should be postponed for a few days, 30% seeding per mu is preferred to wet powder 80 grams, mixed evenly with water sprayed on moistened planting boards. In addition, if it is a direct seeding rice, it must be germinated first until one grain grows in the root and half a grain grows in the bud.

However, after sowing, the planting board should not be too dry, and a thin layer of water should be added before applying the planting board that is too dry, allowing it to dry after natural dripping. When the seedlings grow to the same leaf, a thin layer of water is formed, but it is strictly forbidden to submerge the heart leaves. Chemical weeding was carried out 15 days after the first use, combined with top dressing, mixed with 53% rice seedling (double ultra) wettable powder and chemical fertilizer or fine * 10 15 kg per mu, paved and applied, maintained field moisture, and watered for 5-7 days.

For direct seeding rice, the herbicide 10% glyphosate is used to kill weeds that have already appeared.

Chemical weeding of rice: The use of acetochlor compounds in unsown seedlings is prohibited. The field should be flat, the water layer should not submerge the rice leaves, the dosage of the medicine should be mixed evenly, and the powder should be mixed with fine fertilizer to ensure that the soil fertilizer is mixed evenly to achieve the best results.

Living in rice fields, in order to prevent the concentration of the medicine from being too high, do not use a sprayer, the rice will produce pesticide hazards. Do not use dichloroquinoline acid before the 2-leaf stage of rice to prevent seedlings from producing onion leaves. Applying blockers after rain requires rapid drainage of paddy water to prevent pesticide damage, as water can weaken herbicide effectiveness.

Rational use of medicines. In general, weeds begin to emerge two to three weeks after sowing wheat and after several years of drought. When weeds are small, it is easy to avoid.

When weeds are large, they are difficult to control. Increasing the dose may have an effect on wheat. Weeds grow rapidly during the green phase of wheat, so weeds should be controlled in advance before spitting.

It is better to use green medicine to remove weeds.

There are many types of herbicides, which is a great thing for agricultural consumers. Agricultural products have moved from shortage to prosperity. Although a variety of herbicides have brought certain difficulties to the selection of agricultural consumers, they have enriched the selection content to a certain extent.

Make chemical weeding more selective. Knowledge of relevant agronomic technologies is the basis for the selection of herbicides. Although there are many varieties of herbicides, as long as you master the basic knowledge of relevant herbicides, you will refine a pair of sharp eyes, no matter how the combination formula changes, everything will not deviate from its origin.

The selection of herbicides in non-arable land is relatively large, and there are many categories. Because it is off-arable land for weeding, there is one less safety consideration. As long as the herbicide chosen can get rid of the target of the control, it will be fine.

For example, 41 percent glyphosate, 77.7 percent glyphosate, 88.8 percent glyphosate, diquatat and other non-selective herbicides can be used.

However, in recent years, due to the annual use of herbicides, some weeds have developed resistance, and some malignant weeds are not easy to get rid of non-selective herbicides, and sometimes non-selective herbicides are not as sensitive to special objects as professional single agents. The post-emergence combination herbicide of gramineous crops must be mainly used to control broadleaf weeds, supplemented by the control of gramineous weeds. A single herbicide must be dominated by grasses or broad-leaved weeds.

The most obvious examples, such as legume herbicides, are compounded with small amounts of broadleaf legume herbicides on the basis of imitation of grasses and weeds. The post-emergence herbicide of corn is also based on broad-leaved compound with nicosulfuron, mesotrione, sulfone, etc. Pre-emergence herbicides must have good soil sealing.

Glyphosate is not as good as dioxin for the weeds we often see.

There are many types of such products. Compete for different varieties of biological characteristics, combined with the advantages and disadvantages of products to make different choices. For example, when planting Coptis chinensis for soil treatment, it is necessary to choose simazine.

Because the residual effect period of simazine in the soil is relatively long, the sealing of weeds is better. Coptis chinensis needs to grow in the ground for at least three years before it can be excavated, and in terms of time requirements, it is necessary for the soil to treat herbicides for a long time. When choosing bean species, pendimethalin is generally used for more time, because it is necessary to carry out shallow concrete.

Compared with similar sealing herbs, the effect is more prominent, and the economic cost is similar. However, when the soil was closed before corn seedlings, the compound of chlorachlor and atrazine was mostly used. When choosing the soil treatment of rice seedling seedbed, the compound of butachlor and oxazolone is mostly used, why not choose the formula of acetochlor and atrazine to weed the rice seedbed?

Because atrazine is sensitive to rice and grasses, it cannot be used on it. Therefore, as long as these basic laws are mastered, no matter how the herbicide categories in the agricultural market increase, they are inseparable from these basic common sense. It can be said that it is enough to pick up the map.

The choice can be made based on the nature of the weed, or by understanding the efficacy of each herbicide, or by the specific situation of weeding.

You need to choose according to your own planting situation, different chemical herbicides target different objects, and the effect is completely different.

This needs to be determined according to the type of grass, and the herbicides selected by different plants are different, so be sure to choose the herbicide that suits you.

It is necessary to choose reasonable ingredients, choose the appropriate concentration when spraying chemicals, grasp the time of spraying, and also pay attention to the dosage, and do not spray in a large area.

First of all, it is necessary to choose the right herbicide according to different situations, and then in the process of weeding, we must pay attention to the appropriate time, we must pay attention to the appropriate concentration and dosage, and then we must pay attention to the full mixing with the soil when using, and we also need to choose some professional pesticides.

It is necessary to understand the properties of the soil, but also to grasp the key points, but also to pay attention to the ratio of medicine to water, to grasp the time of application, to grasp the climatic conditions.

Commonly used herbicide application techniques are as follows:

One. Acetochlor

A variety of annual grasses and some broadleaf weeds are useless for perennial weeds.

Crops used: soybeans, peanuts, bud rice, cotton, rapeseed, rice, potatoes and other crops.

Note: Spray weeds before they are unearthed; With the improvement of soil moisture, the drug activity was strengthened. Use in sandy soils with low soil organic matter content, using small doses; Rice seedlings should never be used; Cucumber, watermelon, cantaloupe, spinach, leeks, rice, and sorghum rice are more sensitive to acetochlor, so use with caution or use sparingly.

2. Meolachlor

It has obvious effects on annual grasses such as Matang, Qianjincao, Ox tendon grass, Barnyard grass, Dog's Tail grass, wild oats, hard grass, Kanmai Niang, and Poa precocious. It has a significant effect on broad-leaved weeds such as Liko, nightshade, dodder seed, and large nest cabbage. It is also very effective for sowing Artemisia annua, chrysanthemum, chickweed, etc.

Crops used: rice, soybeans, sugarcane, peanuts, bud rice.

It should be noted that the spraying effect of soil moisture is good, and the effect on some weeds such as purslane, iron amaranth, pig disaster, duck toe grass, horsetail and so on is poor, and it is useless for multi-year growth weeds.

3. Sulfafen

It can spray and kill broad-leaved weeds, such as Chrysanthemum, Willow Thorn Knotweed, Iron Amaranth, Amaranth Retroflexus, Ragweed, Ghost Needleweed, Field Spiral, Chrysanthemum, Li, Morning Glory, Curly Stem, Purslane, Nightshade, Endive, Xanthium. For small thistles, it is basically useless to ask vitex, and the control effect of wolf grass and duck toe grass is average.

Crops used: soybeans, peanuts, black beans.

It should be noted that the residual period of the drug in the soil environment is relatively long, and it is not easy to passivate in the soil environment, and the normal use will not be very harmful to the stubble. However, if the dosage is too large, it will cause damage to Chinese cabbage, sorghum rice, bud rice, wheat, rice, Brussels sprouts, linen, etc.

Fourth, diuron

It can spray most of the annual and perennial weeds, such as horsetail, cow tendon grass, dog tail grass, barnyard grass, li, amaranth, knotweed, purslane, sand grass, etc. It can also be used in rice fields to spray eyelids, four-leaf clovers, buttercups, etc.

Crops used: cotton, sugarcane, soybeans, peanuts, bud rice, cucumbers, rice.

It should be noted that the use of wheat is prohibited, and it has a strong contact killing effect on cotton leaves, and the spraying must be used on the soil surface, and the cotton seedlings are not suitable for use after they are unearthed. The use of gravel land is lower than that of clay resources, and sand seepage fields are not suitable for use.