Chemical weeding has been accepted by the majority of farmers because of its advantages of being fast, efficient, and easy to operate. Especially during the growing season of summer sowing maize, due to the high temperature and high humidity, the rapid growth of weeds, combined with the continuous rainy weather in summer, artificial and mechanical control of weeds is more difficult, but chemical weeding can overcome these shortcomings. In the process of chemical weeding, if the type of chemical herbicide is improperly selected and applied improperly, it will result in poor control effect and even adverse consequences such as injury. Therefore, we hope that farmers' friends will correctly choose herbicide varieties, adopt scientific techniques and methods of use, and master their application skills. In chemical weeding, we should pay attention to the following issues: First, we should clarify the types of weeds. The common weeds in Henan corn fields include crabgrass, goosegrass, barnyardgrass, purslane, amaranthus spp., field bindweed, alfalfa, teff grass, green dog tail, iron amaranth, and aconite. Among these weeds, there are grasses and weeds such as crabgrass, goosegrass, etc., broadleaf weeds such as amaranth, and more intractable weeds with strong fertility such as aconite. Tian Xuanhua, purslane and so on. In chemical weeding, medications should be selected according to the type and distribution of weeds. Second, choose the right type of herbicide. At present, there are many kinds of herbicides on the market, and the names are strange and strange. It is very difficult to choose a suitable herbicide variety among a large number of varieties. Several selection methods are introduced for reference. 1. Do not look at advertising to see effectiveness. In the case of uncertainty, the first choice is the varieties that have been used in the past, such as Xuanhuayi A, Corn Po, and Yubao. These varieties have been tested for many years of production practices. They are safe and effective, and can be bold. Choose. 2. For weed selection. General weeds with Xuanhuayi A, corn treasure, Ebel can completely control. The specific weeds are different, and the herbicides chosen are not the same. For example, if the aconite is severe, it can be controlled by selecting Jin Yi A or Fuzi Qing. 3. Choose the variety for the cornice. At present, most fields use mechanical harvesting of wheat, wheat bran, high grass, and general herbicide control effect is not good, can be quickly blocked or 52% of the new Xuanhuayi A control. 4. According to the time selected varieties. There was no time to apply herbicides when sowing, and corn was also emerged when we saw weeds. At this time we could use herbicides such as Yubao, Yubei, Kangshi, Jinyi, and Fuziqing. Third, pay attention to local conditions, rational drug use. With suitable types of herbicides, it can be said that control efficiency has reached 50%. However, if it is not applied properly, it is difficult to achieve the desired control effect, and even produce phytotoxicity. For example, after corn has been chemically weeded after the three-leaf stage, the sprayer's nozzle should be lower than the height of the bell mouth to prevent the liquid from spraying into the heart of the bell mouth. In addition, it is also necessary to pay attention to the weather during application, and it is generally required to apply drugs on a windless day. When applying pesticides under drought conditions, increase the amount of water or apply pesticides after watering.
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