What should you pay attention to when using herbicides in wheat fields?

What should you pay attention to when using herbicides in wheat fields? How do I do it? Wheat herbicide application should be strict as follows: strict selection of herbicide varieties There are many types of herbicides, and each herbicide has a certain herbicide spectrum. Some herbicides have a narrow control spectrum, such as oatmeal, which can only control wild oats; dimethyltetrachlorine has a good effect on controlling Artemisia, purslane and wild oats, but a poor effect on controlling Galium;2,4-D is effective in controlling dicotyledonous weeds such as amaranth, but ineffective against gramineous weeds. Farmers should select the right herbicide according to the most weed species in the wheat field to receive the desired effect. To control broad-leaved weeds, we can choose herbicide, dicaojing, tribenuron-methyl, and chloronym mixture, etc., which have good weeding effect; while metsulfuron, chlorsulfuron-methyl, and wheat grass can only be used in the early stage of rice-wheat rotation system. If cotton, corn, peanuts, beans, etc. are planted in rice stubble, serious phytotoxicity will occur, resulting in almost no harvest accidents frequently. Strict optimal application time Many farmers choose the time to use herbicides in wheat fields in spring, and wait until the grass age and density of weeds are very large before applying control. At this time, weeds are older and more resistant, so it is necessary to increase the dosage when controlling them, which not only increases the cost, but also easily causes phytotoxicity to wheat and subsequent crops and adjacent crops. If 48% Baicaodi or 2,4-D is used during wheat pregnancy, it will cause wheat not to set seeds due to too late application. Many years of experiments and production practice show that it is better to apply herbicides before winter in wheat fields. The time is generally to select pre-emergence herbicides before wheat emergence, or to select herbicides that can kill weeds that have emerged during the 2 - 4 leaf stage of wheat. 1. Master the temperature when applying pesticide. The temperature of application directly affects the effect of herbicides, such as 2,4-D, dimethyltetrachlorine, etc., the effect is very poor when the temperature is below 10℃, and the effect is good when the temperature is above 10℃; the star herbicide shows weeding effect 30~40 days after application under low temperature conditions. Therefore, the use of herbicides in wheat fields should be applied when the temperature is high in sunny days to give full play to the efficacy. 2. Ensure adequate soil moisture when applying. Soil moisture is an important factor affecting the efficacy of pesticide, whether it is applied in soil before emergence or during wheat growth period. If the humidity of topsoil is high, it is easy to form a tight layer of pesticide soil, and the weed seeds germinate quickly, so the control effect is high. When the herbicide is applied in wheat growing period, if the soil is wet, it is beneficial for weeds to absorb and move the herbicide in the body, so the pesticide effect is exerted quickly and the weeding effect is good. Strictly control the dosage Weeds and wheat are plants, and the selectivity of herbicides is limited. To ensure that herbicides kill weeds and do not harm wheat, the dosage of herbicides must be strictly controlled. It cannot be increased or reduced at will. It must be used according to the dosage described in the instructions for use, and it must be adapted to local conditions. The soil with high organic matter content and fine soil particles has a large adsorption capacity for herbicides, and the soil microorganism has a large number and vigorous activity, and the pesticide is degraded more, so the application rate should be appropriately increased. But the sandy loam particle is bigger, the adsorption quantity to the pesticide is less, the pesticide molecule is free state in the soil particle, the activity is strong, easy to occur the pesticide harm, the dosage can reduce appropriately. Herbicide is stable in alkaline soil, not easy to decompose, long residual period, easy to produce phytotoxicity to the next crop, so the application time on alkaline soil should be as early as possible, and cautious use. Strictly master the spraying technology When using herbicides, be sure to dilute them with enough water and mix them evenly. To achieve uniform spraying, no heavy spraying, no leakage spraying. If adjacent plots are herbicide-sensitive crops, quarantine measures should be taken to avoid spraying when there is wind, so as not to harm crops in adjacent plots. Herbicide spraying equipment, it is best to do special, so as not to spray other pesticides harm crops. If the medical equipment does not have special conditions, after spraying herbicides, it must be washed repeatedly with bleaching powder before it can be used to control crop diseases and insect pests. Click to see more herbicide application techniques Click to see more pesticide application techniques