Chemical weeding in wheat fields is a measure of increasing production with few investments, quick results and high benefits. However, if used improperly, it will not only fail to achieve the desired weeding effect, but may even cause phytotoxicity and cause unnecessary losses. To effectively control the hazards of weeds in wheat fields and ensure safety, we should pay attention to the following seven issues when performing chemical weeding.
(A) to grasp the timing of drug use. Chemical weeding in wheat field is divided into two stages before and after seedling, and the best weeding effect is at the seedling stage. The optimum application time should be determined according to comprehensive factors such as wheat leaf age, weed germination, and weather conditions during seedling application. Generally, in the two-leaf one-to-three-leaf period of wheat, the peak of the germination of weeds and the sunny days of high temperatures are the best. If you do not have medication before the end of the year, you can use it in the middle of March in the middle of the year.
(b) Accurate selection of herbicides. Each herbicide has a certain herbicidal spectrum, such as oats can only control the wild oats, dimethyl tetrachlorine anti-sweet sowing and wild rapeseed effect is good, the effect of poor control of pigs. Therefore, local pesticides should be selected according to the local weed species.
(C) strictly control the dosage. In order to ensure that herbicides kill weeds without damaging wheat seedlings, we must strictly control the amount of medication and must not hate the grass and increase the amount of medication. The amount of water can be flexibly controlled, generally 50 kg per mu water spray. If the soil surface is dry, the amount of water can be increased by a little more to improve the efficacy.
(d) Pay attention to the temperature during medication. The temperature of chemical weeding in wheat fields will directly affect the efficacy of herbicides.
(e) Ensure that there is proper humidity. Pre-emergence medication, if the surface layer of humidity, easy to form a tight blocking layer, and weed seeds germinate soon, so the control effect is high. During the growing season of wheat, if the soil is wet, weeds thrive, which is beneficial to the weeds' absorption of herbicides and their operation in the body, and has a good weeding effect.
(six) to improve drug technology. The use of herbicide must be sprayed evenly, neither re-spray nor spray, and there are no other herbicide-sensitive crops interplanted in wheat fields. Wheat seedlings are thin, and wheat fields that are poorly grown should not be sprayed. Do not use cultivating loose soil in wheat field within 45 days after treatment. Do not apply fertilizer to diffuse water in order to protect the medicinal layer and improve efficacy. Herbicides should not be used for a long time as they are used with them to prevent them from reducing their efficacy. The used sprayer should be rinsed, preferably it is dedicated to prevent damage to other crops.
(7) Soil conditions should be considered. The soil with high organic matter content has a small particle size, a large amount of herbicides, a large amount of soil microorganisms, a vigorous activity, and a degraded dose, and an appropriate amount of six drugs can be added. Sandy soil particles are coarse and have a small amount of adsorbent for pharmaceuticals and can be used to reduce the dosage. Because most of the herbicides in the alkaline soil should not be stable degradation, the residual period of time is prolonged, and it is easy to produce phytotoxicity to the crops of the rear crops. Therefore, the spraying period on such soils should be as early as possible and be used with caution.
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