Which is the best post emergence herbicide for corn, and is the effect of post emergence herbicide g

It is better to use nicosulfuron-methylatrazine as a post-emergence herbicide for maize.

The most common are nicosulfuron, mesotrione, and atrazine. The common compound is nicosulfuron + atrazine, mesotrione + atrazine, nicosulfuron + metrisulfone + atrazine. First of all, you need to look at what kind of grass you have, and then choose the right herbicide.

There are two or three types of post-emergence herbicides for corn, which vary in composition and content. Post-emergence herbicides in corn fields include dimethyltetrachloride, nicosulfuron, mesotrione, chlorofluoropyroxyacetic acid, etc., among which dimethyltetrachloride is used more, and it also has a good control effect on malignant weeds.

Precautions for the use of post-emergence herbicides in corn.

1. Carry out constant spray according to the prescribed dose, and do not increase the dosage at will.

2. The "secondary dilution method" is adopted, which is first prepared into the mother liquor, and then evenly sprayed with water.

3. Generally, the appropriate period for the use of herbicides after corn seedlings should be after the 2nd leaf of the visible leaf of corn to before the 5th leaf of the visible leaf. If the drug is used at the 5 7 leaf stage, it should be used between the corn rows to avoid spraying the liquid into the heart leaves.

4. Some corn post-emergence herbicides are more sensitive to sweet corn, seed making, and inbred lines, so do not use them. It should be used strictly according to the instructions on the herbicide label.

5. Corn treated with organophosphate agents is sensitive to post-emergence herbicides. The interval between the two drugs is at least 7 days.

6. Use a motorized sprayer to apply pesticides, and the dosage shall not be increased without authorization, and repeated spraying is prohibited.

7. Before using herbicides, pay attention to cleaning the sprayer that has been sprayed with organophosphorus pesticides.

8. After 4 p.m., the effect of medication is good, and the medication should be avoided in continuous high temperature weather (temperature over 35).

Corn is treated with physiologically selective herbicides after emergence. Corn post-emergence herbicides are nicosulfuron, nicoditorazine, mesotrione, oxazoleone, acetochlor, atrazine, etc. But no matter how many herbicides there are, there are only these categories:

Amides, triazine, sulfonylureas, phenoxycarboxylic acids, sprayed with selective herbicides with high-efficiency flupyrethoxalin.

Precautions for weeding after corn seedlingsAll post-emergence herbicides should be administered in sunny weather, before 10:30 a.m. or after 4 p.m., during which the weeds can be absorbed quickly and the amount of volatilization of the solution is small. The dosage shall be strictly in accordance with the guidance on the instructions of the herbicide used, and shall not be used in excess to avoid pesticide damage.

There are many varieties of post-emergence herbicides on the market, which are generally mixed preparations of nicosulfuron and atrazine, with content of about 4% and 20% respectively; There is also a 2% 3% mesotrione added to nicosulfuron and atrazine on the basis of nicosulfuron. The dosage is generally about 150 200 grams per mu, mixed with 30 kg of water to spray stems and leaves. Corn seedlings should be used after the 6-leaf stage, and attention should be paid to avoiding new corn leaves, so as not to cause pesticide damage.

Many farmers will choose to use this method, as long as the method is appropriate, then the effect is still relatively good. We should pay attention to the situation of weeding after selecting corn seedlings, we should choose the right time point, and do not choose to spray pesticides when spraying pesticides in high temperature and drought. Because this pesticide is sprayed to control weeds in drought and high temperature weather, corn is also prone to this pesticide damage.

Pesticide damage means that the weeds do not die but the corn dies, which is particularly headache, so it is necessary to master a certain method. <>

When spraying herbicides, do not spray on corn, it is best to spray on weeds, after all, we are weeds, not corn, if you accidentally spray the leaves of this corn, then choose to spray the bottom leaves, do not spray the top. You must be cautious when operating, if you spray corn, then it will be troublesome. <>

After spraying the herbicide, the weeds have 2 to 6 hours to absorb, so the best time to spray the pesticide is after 6 p.m. Spraying pesticides in the evening is better for corn, because this time point is not easy to appear pesticide damage, can be a good effect of weeding, after all, the temperature is relatively low in the evening, pesticides are not easy to evaporate, so it can greatly improve the effect of weeding. Of course, it is not suitable to spray pesticides on rainy days and at noon, because these two time points have no good effect on weeding, so don't do it in vain.

In addition, when spraying herbicides, the weeds should not be higher than the second leaf of the corn, because once the weeds are sprayed higher than the leaves of the corn, they can be easily sprayed on these corn seedlings. In the case of low weeds, then the construction operation is more convenient, according to the corresponding instructions of the pesticide to choose the dilution can be sprayed with a sprayer. For some weeds that are taller than corn, then you need to be cautious when spraying pesticides.

The effect is still very obvious, and the effect is also very good. Nowadays, many farmers buy this thing, and I really feel very good to use it.

The effect is quite good, it can play the effect of weeding, and at the same time can ensure the yield of corn, so it is the best of both worlds.

The effect is still very good. To a certain extent, it can remove weeds, but also remove some insect pests, which can increase the yield of corn and make corn grow more vigorously.

The effect is very good, and it will not affect the growth of corn, and at the same time increase the yield of corn, so it is necessary to know the climate and time of weeding.

Corn can be sprayed with some drugs at the three-to-five-leaf stage When the corn grows five leaves, it can produce a substance that can detoxify, and this substance can eliminate the damage caused by some herbicides, so it is very good to use herbicides when the corn is in the three-to-five-leaf stage, andWhen the corn grows five leaves, some weeds in the ground are still very small, and the effect of herbicides is also very good at this time, and there are many suitable types of herbicides.

When the corn seedlings first germinate, it is best not to play herbicides, because the initial corn seedlings are not bad drugs, and if the herbicides are used, it is very easy to poison the corn seedlings, so the herbicides must be considered more carefully. Some growers choose to use physical weeding by using some tools to hoe or pull out some grass, but this is a very labor-intensive method, so herbicide is also a better choice.

It is best to spray after six o'clock in the evening, because at this time spraying, the temperature is lower after application, the humidity is larger, the liquid medicine stays on the weed leaf surface for a longer time, the weeds can fully absorb the herbicide components, ensure the weeding effect, and the evening medicine can also significantly improve the safety of corn seedlings, and it is not easy to cause pesticide damage.

Corn insecticides are best applied about 7 days after the herbicide, that is, after the 3-5 leaf stage of corn, mainly to control corn armyworm and borerworm.

I think it should be best to apply herbicide to corn seedlings when they have 3 to 5 leaves.

When the corn seedlings grow to more than ten centimeters, or when they have just entered early summer, the effect of spraying is best in these two periods.

Post-emergence herbicides can generally be applied when corn enters the 3-5 leaf stage. When spraying, the temperature is required to be 15-25, the humidity is required to be above 65%, and the wind speed is required to be below 4 meters per second.

The best spraying time is after six o'clock in the evening, because at this time spraying, the temperature is lower after application, the humidity is larger, the liquid medicine stays on the weed leaf surface for a longer time, the weeds can fully absorb the herbicide components, ensure the weeding effect, and the evening medication can also significantly improve the safety of corn seedlings, and it is not easy to cause pesticide damage. A few leaves of corn seedlings can be sprayed with corn post-emergence herbicide, corn 3-5 leaves, weeds 2-4 leaf stage is the best, especially the mixture of Yu Nongle and 2,4-d butyl ester can not be applied after the 5-leaf stage of corn. The weeds in the field are basically complete, and most of the weeds are sprayed at the 2 4 leaf stage.

If the application period is too late, the weed resistance will be enhanced, and the weeding effect will be affected. When spraying, the temperature is required to be 15 25, the relative humidity of the air is more than 65%, and the wind speed is less than 4 meters per second. Select the spraying equipment and nozzle as required, and apply the spray according to the operation specifications.

Good brands of corn post-emergence herbicides: ADAMA, rainbow, Xin'an, Lier, Fuhua Tongda, Yangnong and so on.

1. ADAMA.

Founded in 1958 and part of the Syngenta Group, ADAMA is the world's largest crop protection company, a multinational crop protection company formed by the merger of ADAMA Agricultural Solutions and Hubei Sanonda Co., Ltd., providing a wide range of weeding, insecticidal and disease resistance solutions for local farmers, with a product line of more than 270 active ingredients sold in more than 100 countries.

2、rainbow

Founded in 2005, the company is a multinational crop protection company born in China, focusing on the field of crop protection, and its main products are herbicides, insecticides, fungicides, plant growth regulators and seed treatment agents, a total of five categories, and has built a complete industrial chain covering the R&D, manufacturing and brand, channel, sales and service of raw materials and preparations for the global market.

3. Xin'an. Founded in 1965, Xin'an Group is mainly engaged in two major industries: crop protection and silicon-based new materials, of which the field of crop protection is mainly glyphosate original drugs and dosage form products, and a variety of original drugs and preparations are developed simultaneously.

4. Lear. Founded in 1993, Lier is mainly engaged in the research and development, production and sales of high-efficiency and safe pesticides, including herbicides, insecticides, fungicides and three series of more than 30 original drugs, more than 100 preparation varieties and some chemical intermediates.

5. Fuhua Tongda.

Founded in 2007 and affiliated to Fuhua Group, Fuhua Tongda is a large-scale glyphosate production base in China, mainly engaged in the research and development, production and sales of herbicide series products, with more than 10 branches around the world, and its products are exported to more than 100 countries and regions around the world.

6. Yangnong. Yangnong Chemical Co., Ltd. was founded in 1958 and listed in 2002, with a new biomimetic pesticide pyrethroid production base, specializing in the production of pesticides, chlor-alkali, fine chemical products of large pesticides, chemical enterprises, series of products with pyrethroid product series, pesticide product series, basic chemical product series, is the core of many multinational companies, products are exported to more than 80 countries and regions around the world.

Reference: Encyclopedia - ADAMA (Beijing) Agricultural Technology****.

1. Nitrate, smoke and atrazine suspension answer's brightener.

In the 3 to 5 leaf stage of corn and the 2 to 4 leaf stage of weeds, 165 to 200 grams of 28% nitrate, tobacco and atrazine suspension agent per mu are evenly sprayed, which can effectively control annual broad-leaved weeds and some gramineous weeds such as barnyard grass, dogtail grass, horsetail, cow tendon grass, duck plantar grass, hemp hemp, quinoa, purslane, antibiotic amaranth, iron amaranth, self-growing wheat seedlings, etc.

2. Oxazolone terbutizine.

In the 3rd to 8th leaf stage of corn, 80 to 100 ml of 26% oxazole pyridazine water dispersible oil suspension agent can be used per mu at the 2 to 5 leaf stage of weeds, and 17 to 30 kg of water can be evenly sprayed. It can effectively control annual broad-leaved heterocorletic grass and gramineous weeds in maize field.

3. Nicosulfuron.

It is a common corn post-emergence herbicide, the formula is universal, the stability is good, it has the effect of rooting weeds, and the safety of the pesticide is also good, but the speed of dead grass is relatively slow, if the spraying temperature is not high, then it is normal to die grass 15 to 20 days after spraying.

4. Mesotrione.

It is the weeding formula used by many people now, and it has a good control effect on the broad-leaved weeds in the corn field and some of the sharp-leaved grasses, compared with nicosulfuron, its dead grass is fast, but the weeds are prone to the situation of **, and the root killing is not complete.

5. Atrazine.

It is a very excellent herbicide that can be used before and after the emergence of corn, because the herbicide is not easy to produce resistance, although it has been used for more than 60 years, the weeding effect is still very good, and it is the most used herbicide variety in corn fields at present. To control common weeds in corn fields, before corn sowing, or corn 3 5 leaf stage, weeds 2 to 5 leaf stage, with 50% atrazine per mu can be dispersed by 150 to 250 ml of suspension agent, 15 to 20 kg of water evenly sprayed once.

6. Bisbenzoxazolic acid.

It is currently the most widely used and safest safety agent, which is widely used in wheat fields, rice fields, corn fields, etc., to prevent herbicide damage. The agent is mainly added to nicosulfuron, sulfasulfuron, mesotrione, cyclosulfone and other amide herbicides, among which sulfasulfuron is used, summer corn is used in the 3 to 9 leaf stage of corn, 6 grams of 25% sulfasulfuron water granulant per mu, or 100 to 150 ml of 25% sulfone atrazine dispersible oil suspension + 10 ml of 10% bisbenzoxazole acid, evenly sprayed with 30 kg of water, high safety for corn, good weeding effect.