Corn post-emergence weeding correct operation prevent injury

Core Tip: In recent years, weeds have been constantly improving their stress resistance, which has a serious impact on the growth of corn. If we do not pay attention to the details of weeding, we will rely on our old experience to not only fail to control weeds but also produce phytotoxicity. Therefore, we can only avoid the occurrence of phytotoxicity by mastering the correct methods of operation, including weeding time and spraying methods.

Spray time

In the high temperature, drought morning, noon or afternoon spraying, due to strong light, the liquid quickly evaporates, and the amount of herbicide entering the weeds is obviously insufficient, which seriously affects the weeding effect, and corn seedlings are also prone to injury. The optimum spraying time of post-emergence herbicides for maize is after 6 o'clock in the evening. Because the temperature is lower and the humidity is higher after the application, the liquid stays on the weed leaves longer and the weeds can fully absorb the herbicides. The herbicide composition guarantees the herbicidal effect. The use of herbicides in the evening can also significantly improve the safety of corn seedlings, and is less prone to phytotoxicity.

Spray method

Mu 15 ~ 30 kg of watered dose, see grass spraying, spray careful, no grass to go, save time and good effect provincial drug.

Look at the size of the grass

When herbicides are sprayed on corn seedlings, many farmers think that the smaller weeds are, the less resistant they are and the easier they are to be killed. Actually not, because the grass is too small and there is no medicine area, the weeding effect is not ideal. The best grass age is 2 leaf 1 heart to 4 leaf 1 heart, when the weeds have a certain area of ​​the drug, the resistance is not large, weeding effect is obvious.

See seed size

The optimum spraying time of postemergence herbicides for maize is 2-5 leaf stage of maize, and the corn has high resistance and is not susceptible to phytotoxicity. 5 leaves can be sprayed before the entire field, 6 leaves after the spray should be sprayed on the corn head to lower the nozzle spray to prevent liquid medicine caused by phytotoxicity (mainly no safety agent nicosulfuron, if it is a safety nicotine The sulfoxylon boutique can also spray all fields.)

Mixed pesticides

Within 7 days after spraying the post-emergence herbicides, pesticides such as organophosphorus pesticides must not be sprayed. Otherwise, phytotoxicity may occur. However, it can be sprayed with pyrethrins and carbamate insecticides. When spraying, care should be taken to avoid the leaves as much as possible and to prevent the liquid from pouring. This year, some of the cornfields in Sweden are seriously affected by flies and thrips. Controlling these two small pests can be done with imidacloprid or acetamiprid, but when spraying, do not mix with post-emergence herbicides.

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