Out of the misunderstanding of summer corn chemical weeding

In recent years, summer corn chemical weeding technology has been widely used, but farmers have some misunderstandings in the application process, reducing the control effect.

Misunderstanding 1: As long as it is a special herbicide for corn, it can be used. Since farmers do not know enough about the types of weeds and herbicides, it is believed that all weeds can be controlled as long as they are corn-specific herbicides.

Countermeasure: Put the medicine on the grass. The choice of herbicide should be determined according to the type of weeds and the time of use. For corn fields with horsegrass, goosegrass, foxtail, sorghum, sorghum and sorghum, 40% acetaminophen or 41% eucalyptus can be used. 150 ~ 200 ml, or 50% of the mixture of 150 ml, used in the seedlings after sowing, can not be later than the weeds 2 leaf stage. You can also use 4% Yu Nong Le 60 ml, which is used in the 3~5 leaf stage of weeds.

Misunderstanding 2: The herbicide effect is better when the dosage is larger. In order to improve the herbicidal effect of summer corn, some farmers blindly increase the amount of drug used, which not only causes the medicinal damage of the season corn, but also affects the growth of the squat crop.

Countermeasures: Strictly control the amount of medication. At present, there are many types of herbicides in corn fields, and the content of active ingredients is different, and the dosage is not the same. In use, the dosage should be strictly controlled, and the dosage should not be too large or too small. It must ensure the herbicidal effect and can not affect the growth of corn and squat crops.

Misunderstanding 3: Wheat bran, wheat straw, wheat bran will not affect the weeding effect. At present, most of the wheat fields are harvested mechanically, wheat straw and wheat bran are scattered in the field, and the height of the wheat bran is generally about 2 cm. When the farmers do not kill the corn, the corn herbicide will spread on the wheat bran, wheat straw and wheat bran. The soil surface and weeds are exposed to less liquid, which does not function to close the ground and kill grass.

Countermeasure: Gaomai Putian should increase the dosage. For mechanically harvested wheat fields, the wheat straw and wheat bran should be removed first, and then the herbicide should be used and the dosage should be appropriately increased. Generally, the recommended minimum dosage can be used for the flat wheat field, and the recommended maximum dosage can be used for the high wheat field. However, the dosage should not be increased arbitrarily to prevent the growth of corn and squat crops.

Myth 4: Do not use the medicine regardless of the weather. Summer corn growth period is high temperature season, more drought and less rain, spraying herbicides quickly evaporates, it is difficult to form a film on the surface, while high temperature and drought also hinder the delivery and transmission of drugs in the weeds, affecting the normal effect of drug efficacy .

Countermeasures: In case of drought, water should be used first after watering. In the dry year, the water should be sprayed first, and the ground should be wet when spraying, in order to form a film on the ground.

Misunderstanding 5: The effect of weeding is the same as that of the day before and after the day. At present, the herbicides in corn fields are more effective in controlling the weeds before the 5-leaf stage. However, due to various reasons, the control period is often missed, causing the weeds to grow up and the resistance to herbicides to be enhanced, resulting in poor control effect. .

Countermeasures: Use medicine at the right time. According to the appropriate period of use of the herbicide used, the time of administration should be reasonably determined to prevent the spraying from being too late and affecting the efficacy.

Myth 6: Ignore the big grass left in the wheat field. The control of weeds in some wheat fields is not complete, resulting in the weeds growing up in the corn field, and the general herbicides for corn have no control effect on the grass.

Countermeasure: For corn fields with large grass, spray the ground with 20% paraquat immediately after the corn is planted, and then spray the corn special herbicide.

Misunderstanding 7: A bucket of water saves labor and effort. Many farmers save labor and labor. When spraying herbicides, the amount of water added is too small. Generally, 15 kg (1 sprayer) per acre of liquid is used, and the film is not formed on the ground, thus affecting the exertion of the efficacy.

Countermeasure: increase the amount of liquid medicine. Generally, the amount of liquid used per acre is 30~40 kg. For corn fields with high wheat stubble and 40-50 kg in the year of drought, the ground should be moistened after spraying.

Misunderstanding 8: Apply the medicine to the ground. One is that the suspending herbicide is used without being shaken well, which affects the herbicidal effect. The second is to use the forward-style spraying method, so that the liquid that has just been sprayed to the surface is trampled or stuck away when the film has not yet formed, so that the grass is continued to grow in the place where the foot is stepped on. The third is that the spraying is uneven, there is a phenomenon of leakage or re-spraying, and the grass is continued without spraying the medicine.

Countermeasure: Apply the medicine correctly. First, the herbicide should be paired into the mother liquor. The suspension should be fully shaken and used. It should be sprayed off when spraying. The spraying time should be controlled before the 9:00 am and after 5 pm. . Do a uniform spray, no heavy spray, no leakage.

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