Chemical weeding has been accepted by farmers because of its advantages of fast, efficient and easy operation. Especially in the summer maize growing season, due to high temperature, high humidity, rapid growth of weeds, and often rainy weather in summer, artificial and mechanical control of weeds is more difficult, but chemical herbicides can overcome these shortcomings. In the process of chemical weeding, if the chemical herbicides are improperly selected and the application method is improper, it will cause adverse effects such as poor control and even phytotoxicity. Therefore, it is hoped that farmers' friends will choose the correct type of herbicides and adopt scientific techniques and methods to master their application techniques. When conducting chemical weeding, you should pay attention to the following issues:
First, find out the types of weeds.
Common weeds in corn fields include crabgrass, goosegrass, valerian, purslane, amaranthus, turf, scorpion, teff, green dogtail, iron leeks, and fragrant aconite. Among these weeds, there are grass weeds such as crabgrass, goosegrass, etc., as well as broadleaf weeds such as anti-twigs, and more refractory, fertile weeds such as fragrant aconite. Tian Xuanhua, purslane, etc. When chemical weeding is carried out, the drug should be selected according to the type and distribution of weeds.
Second, choose the appropriate herbicide variety.
At present, there are many varieties of herbicides on the market, the names are strange, and the fish are mixed. It is very difficult to select a suitable herbicide variety among a wide variety of varieties. Several selection methods are now presented for reference.
1, do not look at the ads to see the effectiveness. In the case of inaccuracy, the first choice is the varieties that have been used in previous years, such as Xuanhua E, Ma Bao, Yu Bao, etc. These varieties have been tested for many years of production practice, safe and effective, bold Use.
2. For weed selection. The general weeds can be completely controlled by Xuanhua E, Ma Bao and Yu Bao. Different types of weeds are different, and the selected herbicides are not the same. For example, the severe field of the fragrant aconite can be controlled by the selection of gold or aconite.
3. Select the variety for the mouth. High in height, high in grass, general herbicides are not effective, and can be controlled by fast blocking or 52% of new biochemical pesticides .
4. Select the variety according to the time. There is no time to apply the herbicide at the time of sowing. When the weeds are seen, the corn has also emerged. At this time, herbicides such as Yubao, Yubei, Kangshi, Jinyi, and Fuziqing can be used.
Third, pay attention to local conditions and rational use of drugs.
With a suitable herbicide variety, it can be said that the control effect has reached 50%. However, if it is not properly applied, it is difficult to achieve the desired control effect, and even the phytotoxicity such as corn chemical weeding after the three-leaf period, the nozzle of the sprayer should be lower than the height of the bell mouth to prevent the liquid from being sprayed onto the bell mouth. Within the heart of the heart. In addition, you should pay attention to the weather when applying the medicine. Generally, it is required to apply the medicine on a windless day. When applying under drought conditions, the amount of water should be increased or applied after watering.
Fourth, how to choose herbicides?
1. Choose an appropriate herbicide based on the crop and weed species. Herbicides are generally selective, and different herbicide varieties have different effects on crops and weeds. Farmers must carefully read the product label or instructions when choosing a herbicide, or purchase it under the guidance of agricultural technicians. The herbicide chosen should be safe for the crop used and efficient for crop weeds. For example, 2,4-D-butyl ester and metformin chloride are safe for gramineous crops such as wheat and corn, and can kill dicotyledonous weeds such as gray peas and leeks, but generally belong to grasses such as valerian and maiden. Weeds are invalid.
2. Select appropriate herbicides based on crops and weeds at different growth stages. The period of herbicide use can be divided into pre-sowing soil treatment, pre-emergence soil treatment and post-emergence stem and leaf treatment. Appropriate herbicides should be selected according to the application period.
3, taking into account the appropriate herbicides before and after crop selection. Long-lasting herbicides such as chlorsulfuron, metsulfuron-methyl, acesulfame-methyl, chlorsulfuron-methyl (beansulfuron-methyl), chlorhexidine, chlorhexidine, and atrazine have longer residual effects in the soil. The sputum sensitive crops can cause phytotoxicity. When using this type of herbicide, it is necessary to take into account the raking crop. In this pesticide network , if the soybean field using chlorsulfuron-methyl is used, it is not suitable to plant sensitive crops such as field vegetables, rapeseed, rice, potatoes, melons and vegetables, and the squat can grow wheat, soybeans and corn.
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