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First, we must choose the correct herbicide. According to the types of weeds in different regions, crop varieties and growth period, soil texture and weather conditions, select herbicide types for crop safety to avoid misuse or misuse.
Second, we must limit the use of long-lasting herbicides. While ensuring the herbicidal effect, select herbicides that are safe for the season and after crops, and limit and prohibit the use of long-lasting herbicides.
Third, we must strictly control the period and dosage of medication. Apply in strict accordance with the period of use and dosage prescribed in the product manual. The post-seed weeding of maize should be in the 3~5 leaf stage, before the 2 leaf stage and after the 10th stage, the phytotoxicity is easy to occur; the weeding of soybean seedlings should be carried out in the 2~3 leaf stage and the weed 2~4 leaf stage; It is necessary to apply the medicine 1 to 5 days after the sowing; do not increase the dosage and avoid repeated sprays.
Fourth, we must use vegetable oil spray additives. Add appropriate amount of vegetable oil spray aid to the liquid to reduce herbicide drift, reduce the amount of herbicide, reduce the environmental pollution of herbicides, and avoid side effects of herbicides.
Fifth, the correct use of the applicator. The applicator should be carefully cleaned before and after use, and the applicator for spraying the herbicide should be used exclusively. Use a fan-shaped nozzle to ensure even atomization.
Six should pay attention to the use of herbicides in adjacent plots. Gramineous crops (wheat, corn, rice, millet, sorghum, sugar cane) should be used with or without herbicides. It is carried out without wind or breeze to prevent the particles of the agent from drifting or spreading to adjacent sensitive crops.
Seven should use herbicides reasonably. Avoid long-term use of single herbicide varieties, reduce the emergence of weed resistance (drug resistance) and the replacement of dominant weed populations. Mix different types and different herbicide herbicides to reduce the dosage of single agent. The long residual herbicide reduction is mixed with other herbicides to improve the herbicidal effect, reduce the side effects of the herbicide, and avoid the resistance of weeds.
Eight to master the technical points of the use of herbicides. Sanzhun: the timing of application, the amount of application, and the area of ​​the applied plot. Spray 30 to 45 kg of liquid medicine on one acre of land, and apply it before 10:00 am and after 5 pm. Four look: look at the seedlings, grass, weather, soil application, not rooted or thin seedlings are not easy to apply, according to the type and growth of weeds, when the temperature is low, the upper limit of application, the wind speed is greater than 4 m / sec Spraying, soil with high viscosity and organic matter content is higher, sandy soil is less used, and the soil is dry without blocking treatment. Five: The seedlings are weak, the seedlings are not applied, the paddy field is less than 3 cm or the water depth is overwhelmed by the heart leaves. If the soil is too dry or the air humidity is less than 65%, no application is applied, heavy rain, field water or leaves. Do not apply when there is dew, and do not apply the medicine during the sensitive period.
Scientific use of herbicides
Weeds and crops compete for water and fertilizer, compete for light, compete for space, spread a variety of pests and diseases, and seriously affect the safety of agricultural production. With the adjustment of planting structure and the improvement of production level, the occurrence of farmland weeds is increasing. How to use herbicides?
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