Weeds and crops compete for water and fertilizer, contend for light, compete for space, spread various diseases and pests, and seriously affect the safety of agricultural production. With the adjustment of the planting structure and the improvement of the production level, the hazards of farmland weeds are increasing. How do we use herbicides?
One must choose the herbicide correctly. According to the types of weeds in different regions, crop varieties and growth periods, soil texture and weather conditions, the types of herbicides for crop safety are selected to avoid misuse or misuse.
Second, it is necessary to limit the use of long-lived herbicides. In addition to ensuring the herbicidal effect, herbicides that are safe for the current and subsequent crops are selected to limit and prohibit the use of long-lived herbicides.
Third, we must strictly control the medication period and dose. Strictly follow the application period and the amount of medication prescribed in the product specification. Maize post-emergence weed control should be in the 3 to 5 leaf stage, easy to produce phytotoxicity before and after the 2 leaf stage and 10 leaf stage; soybean weeding should be carried out in the 2 to 3 leaf stage, weeds 2 to 4 leaf stage, and the soil must be closed and weeded. It is necessary to apply the drug 1 to 5 days after sowing; do not increase the dosage at random and avoid repeated spraying.
Fourth, use vegetable oil spray additives. The appropriate amount of vegetable oil spray adjuvant is added to the liquid to reduce the drift of herbicides, reduce the amount of herbicide, reduce the environmental pollution of herbicides, and avoid the side effects of herbicides.
Fifth, the correct use of spraying equipment. The spraying equipment should be carefully cleaned before and after use, and the herbicide sprayed should be used exclusively. Use fan nozzles to ensure even spray.
Six should pay attention to the use of herbicides in adjacent plots. When grass crops (wheat, corn, rice, millet, sorghum, sugar cane) are used adjacent to or mixed with broad-leaved crops, care should be taken when using herbicides. Weeding and weeding should avoid damage to other crops. The absence of wind or breeze prevents the particles from drifting or spreading to adjacent sensitive crops.
Seven must use herbicides rationally. Avoid long-term use of single herbicide species, reduce weed resistance (drug resistance) and replacement of dominant weed populations. Different herbicides of different types and different herbicidal ranges were mixed to reduce single dose. Combine long-term herbicide reductions with other herbicides to increase weed control, reduce side effects of herbicides, and avoid weed resistance.
Eighth, we must master the technical points of using herbicides. Three standards: the time of application, the amount of application, and the area of ​​the application area. A 30-45 kilograms of liquid medicine is sprayed on one mu of land, and it is applied before 10 o'clock in the morning and after 5 o'clock in the afternoon. Four look: see the seedlings, grass condition, weather, soil application, not taking root or thin seedlings is not easy to apply, according to the type of weeds and growth conditions medication, when the temperature is low when the upper limit of the application, the wind speed is greater than 4 meters / second Spraying, soils with high viscous weight and organic matter content have higher dosages, sandy soils use less soil, and there is no need to seal the treatment agent when the soil is dry. Five no: weak seedlings, seedlings are not applied, rice field water is less than 3 cm shallow or the water depth is not applied to the leaves, the soil is too dry or the air humidity is less than 65%, no pesticide is applied, heavy rain, field water or leaves There is no pesticide when there is dew, and no pesticide is applied during the sensitive period of the crop.
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