When is it better to apply herbicides to soybeans?

The herbicide can be applied after soybean sowing and before emergence, or for stem and leaf treatment at the 3-5 leaf stage of weeds. Pesticides should be sprayed evenly. Generally, it is suitable for sunny or cloudy days, no wind and no breeze below level 3, the temperature is stable above 10, and herbicides are applied when there is no dew on the leaves.

In general, it is better to treat it at the time of compound leaf stage, and it is treated according to the actual situation.

The best time to apply a soybean herbicide is 3 to 5 leaves. Herbicides for soybeans should be chosen according to the type of weed, and the weather should also be paid attention to.

In the process of soybean planting, in order for it to grow better, we should choose the right herbicide according to the soil texture and organic matter content, so when should the soybean be treated with herbicide? The details are as follows:

1. The time for soybean herbicide.

There are many types of herbicides in soybeans, the more common ones are acetochlor, glyphosate, benzonda, fleding, azinone and so on. When spraying herbicides for soybeans, you can choose according to soil texture, organic matter content, pH value and natural environment. The spraying of the agent must be even, and it is best to use more than two mixed herbicides, so that the effect is best after spraying.

There are two types of soybean herbicide sprays, one is used before sowing or 3 to 5 days before emergence after sowing, and the other is used after emergence.

When spraying soybean herbicides, it is best to control the temperature at 15 25, because too high or too low temperature is not conducive to the effectiveness of herbicides, and it should be noted that before 10 am and after 3 pm is the best time for herbicide spraying. Don't respray or miss it.

2. Reviews. Most of them are planted in a wide range of areas in China, and in order to prevent weeds and soybeans from competing for nutrients, it is necessary to spray herbicides reasonably. There are many types of herbicides in soybeans, often divided into pre-seedling use and post-seedling use, spraying herbicides should pay attention to the reasonable temperature, the temperature is too high and too low are not suitable for weeding, and spraying should avoid the high temperature at noon.

In order to avoid pesticide residues, Anfago herbicide safety control agents can be sprayed.

Soybeans can only be herbicide when there are three compound leaves, that is, there are three leaves on the petiole to count as a compound leaf, and soybeans can only use herbicides when they reach three such compound leaves, and the use time of herbicides on soybeans is also very important. Leaf burning in soybean herbicides is a normal phenomenon and generally does not affect yields.

The most commonly used in production is Pusit. The pesticide is applied when the weeds are just unearthed, generally no later than the soybean 2 compound leaf stage. The dosage of Pust in the early stage of emergence is:

5% Pust water agent per kilogram per hectare, should not exceed kilograms. It should be applied in weather with high humidity before and after rainfall, avoiding hot and dry noon and windy weather.

Acetochlor can be used as a blocking treatment before seedlings, and quinoxalin + sulfafen can be used at the 2-4 leaf stage of weeds after seedlings.

Can soybean herbicides hit soybeans.

Soybean herbicides include acetochlor, chlorsulfuron-methyl, thiensulfuron-methyl, glyphosate, quinoxalin, flusulfafen and other drugs. When using herbicides, appropriate herbicides should be selected according to soil texture and organic matter content, and sprayed evenly, without respraying or missing spraying. The temperature suitable for soybean herbicide is 15-25 °C, the temperature is too high or too low is not suitable for weeding, and it is advisable to carry out weeding before 10 am and after 15 pm.

1. What are the soybean herbicides?

1. There are many types of soybean herbicides, including acetochlor, chlorsulfuron, thiensulfuron, glyphosate, pyroflufluoxalin, bendasone, imidazole ethylniacin, fluorethalin, azinone, quinoxalin, sulfafen, isoxagrass, etc.

2. Select herbicides according to soil texture, organic matter content, pH and natural conditions. The spraying of the agent should be uniform, adhere to the standard operation, spray evenly, do not respray, and do not leak spraying. The mixing should be thorough, and the time and depth of the mixing should be determined according to the type of herbicide.

When using more than two mixed herbicides, the herbicide formula should be changed from year to year on the same plot.

3. Choose to apply soybean herbicide in high temperature weather, the temperature suitable for soybean herbicide is 15-25 °C, if the temperature is lower than 13 °C, or higher than 30 °C, it is not recommended to use the drug. There is an option to weed before 10 a.m. and after 15 p.m.

Second, when to fight soybean herbicides

1. Acetochlor can be used before sowing or after sowing 3-5 days before emergence. It is generally used as a soil treatment, with high soil organic matter content, high dose in clay loam or arid conditions, low organic matter content, low dose in sandy loam soil or moist soil, and the soil should be kept moist after application.

2. Chlorsulfuron can be used in soybean seedlings before and after seedlings, but it is easy to produce pesticide damage after seedlings, and its use is generally not recommended. It is mainly used for the control of broad-leaved weeds in soybean fields, and can control weeds such as Xanthium, wolfgrass, weasel petal flower, fragrant herb, and hemp.

3. Azinone is generally used 3-5 days before emergence after sowing. It mainly controls a variety of broad-leaved weeds such as amaranth, wolfweed, and Xanthium.

4. Glyphosate can be used 2-3 days before the emergence of soybeans after weeds emerge. It is suitable for early spring weeds control on newly opened wasteland and plots with perennial weeds.

5. Quinoxalin was treated with stems and leaves at the 3-5 leaf stage of soybean seedlings and gramineous weeds. Reduce the dose appropriately when the weeds are small, and increase the dose when the weeds are large or there are many perennial weeds.

The suitable time for soybean weeding is to control when 1-3 compound leaves and 2-5 leaves of weeds after soybean seedlings emerge, but it is important not to start spraying before the weeds grow 3 compound leaves, because the weeds at this time are more difficult to control, and the use of herbicides too much will also make the weeds resistant, and the time to use herbicides can not be too early or too late, because the early application of weeds is uneven, and the weeds can not be killed if they do not touch the agent.

1. When to apply herbicides after soybean seedlings.

1. The suitable time for soybean herbicide is to control soybean 1-3 compound leaves and weeds 2-5 leaf stage after emergence, and the weeds at this time have grown to a certain extent, such as the 3-5 leaf stage of barnyard grass and the 2-4 leaf stage of broad-leaved weeds, but it should be noted that the control of duck plantar grass must start before the 3-leaf stage, and it is more difficult to control after 3 leaves.

2. When using herbicides, the pesticides can not be applied too early, because the weeds are not evenly seeded before the pesticides are applied, and the weeds that emerge later cannot be killed if they cannot contact the pesticides. If the pesticide application is too late, the resistance of soybean will be weakened, the weed resistance will be enhanced, and the difficulty of control will increase, and the dosage of pesticide will be increased, which will not only increase the cost, but also easily cause pesticide damage.

3. Generally, there are grasses and weeds in soybean fields, such as horsetail, barnyard grass, cow tendon grass, dogtail grass, etc.; There are also broad-leaved weeds, such as Amaranth retroflexus, Amaranth ironclad, Xanthium, purslane, etc.; In addition, there are weeds such as quinoa, spiny green, field spin flower, duck plantar grass, etc., so different agents should be used according to different weeds.

Second, what medicine is good for soybean weeding?

1. Different agents should be used according to different weeds, if you want to control gramineous weeds, you can choose cletholate, pyropyroxafen, high-efficiency flupyrimethoxalin, quinoxalin, quinoxalene, enylpyridine and other agents.

2. If it is to control broad-leaved weeds, you can choose trifluorocarboxyfen, ethylcarboxboxoffen, lactoxafen, methylazinate, chloroestersulfachlor and other agents, and some vegetable oil additives can be added to enhance the weeding effect of herbicides for stem and leaf treatment.

3. When using, it should be noted that the dosage must be adjusted according to the number of weeds and the emergence of soybeans, and the dose should not be too much to prevent pesticide damage, but not too little, because too little will lose the effect.

1.Sulfafen. Also known as Huwei, it is a post-seedling herbicide in soybean fields, preventing and controlling broad-leaved weeds, and annual and perennial broad-leaved weeds such as duck plantar grass, small fruit grass, red knotweed, wolf grass, cyst sunflower, ear grass, and field spinning flower.

The dosage to be used is: 250 g of sulfafen aqueous agent per hectare.

2.Refined and cautious. It is a systemic herbicide, with high activity and rapid efficacy, and has a good control effect on most annual grasses at very low concentrations.

It can prevent and remove annual grasses such as Mai Niang, Ma Tang, Barnyard Grass, Dogtail Grass, and Wild Oats. The dosage is: 5% quinoxalin EC 450 900 ml per hectare.

3.High-efficiency flupyramethoxalin. It is also known as high-efficiency grass covering, the number of internal rounds is strong, it can be absorbed by weeds for a long time, the activity is high, the efficacy is rapid, and it has a good control effect on most of the annual and perennial grass weeds.

It also has a good control effect on perennial stubborn grasses such as reeds and white grasses. The dosage used is: 450 900 ml per hectare of high-potency flupyramethoxalin EC.

4.Cletholate. It is a systemic herbicide with high activity and rapid efficacy, and has a good control effect on most annual gramineous weeds at very low concentrations.

It can prevent and remove annual grass weeds such as Mai Niang, early maturing grass, stick head grass, dog tail grass, barnyard grass, and horse tang. The dosage used is: 12% cletholate EC 375 525 ml per hectare.

5.Essence pyroxalycephalin. It is a systemic herbicide, with high activity, rapid efficacy, and good control effect on gramineous weeds.

It can prevent and remove annual grass weeds such as Mai Niang, barnyard grass, dogtail grass, and Ma Tang. The dosage is: 10% emulsifiable concentrate 450 675 ml per hectare.

Sulfafen.

The main product is 250 grams of liters, 25% water, which can be compounded with quinoxalin, isoxafen, herbicidal pine, etc., flusulfafen is also known as Huwei, which is the trade name of 250g l fluorosulfonate simple amine aqueous agent launched by Syngenta, which is well-known because of its great influence. Sulfafen is also a diphenyl ether herbicide developed by Syngenta, which is mainly used to control broadleaf weeds after soybean sprouts; Its mechanism of action is through leaf absorption, which destroys the photosynthetic vertical spine. Sulfafen is used in the true leaf stage of soybean seedlings to the stage of one compound leaf, and the dosage is too large or the soybean is easy to cause pesticide damage after flowering.

Kill steadily. It belongs to the post-seedling selective stem and leaf treatment herbicide, which can be used for a variety of broad-leaved crops, and has a special effect on weed control, and the specific dosage is: to control 2 3 leaf stage annual grass weeds, 500 750 ml per hectare with 15% precision killing; control 4 5 leaf stage, with 750 1000 ml per hectare; For the control of 5 6 leaf stage, use 1000 1200 ml per hectare.