Best weeding at both time periods At present, the wheat planting in our province is basically over, and the weeds in the wheat fields will slowly show their heads. According to the different regional medication habits, some farmers like to use drugs after the year, while others use it to fight herbicide years ago. Long-term practice has proved that wheat seedling stage (mid-late and late November) and returning green stage (late February to early March) are the best time to control weeds in wheat fields. Wheat seedlings (mid-late and late November) are used. On the one hand, when wheat is in the 4-leaf or 4-leaf 1 heart stage, it is more tolerant to herbicides and less susceptible to phytotoxicity. In addition, most of the weeds It is already out of line, and the grass age is relatively small, the resistance to the medicine is also relatively small, and the amount of the medicine is not too large, and the weeds can be removed. Returning to the green period (late February to early March) can also control weeds in wheat fields. However, because weed grasses have a larger grass age and are more resistant, we must increase the amount of pesticides to be effective. The cost of medication, but also easy to cause injury, pay special attention during the application. Use suitable herbicides and formulations Herbicides selected for chemical weed control in wheat fields should be determined based on the herbicide spectrum of the main weed species and herbicides. When a wheat field weed species is in the same range of herbicide herbicide spectrum, a single herbicide can be used for control; when several weed species occur, such as when dicotyledonous weeds and monocotyledon weeds are mixed, several Herbicides are applied in a certain proportion to increase the herbicide spectrum and improve the herbicidal effect. For wheat fields dominated by broad-leaved weeds such as sow wormwood, leeks, wheatgrass, ion grass, alfalfa, and alfalfa, 10% tribenuron-methyl wettable powder can be used, 10 grams per acre, or 75% alum. Long-water dispersible granules, 1 gram per mu. In barley-based wheat fields, 70% chlorazuron-methyl water dispersible granules can be used, with a dosage of 3 to 4 grams per mu. In the wheat field dominated by bowl flowers, 20% chlorofluoropyroxylic acid can be used, with a dosage of 50-70 ml per mu. To see the Mainia, the main wheat-grass field, the choice of 10.8% fenazole oxalonine EC, 30-40 ml per acre dosage, or 15% clodinafop-propellant WP, 30-40 grams per acre dosage. A wheat field with a mixture of brome and broad-leaved weeds can be mixed with 70% fenofosulfuron-methyl dispersible granules 3 to 4 g and 10% tribenursulfuron-containing wettable powder 10 g/mu. The above formula watered 30 to 40 kilograms per mu, using a hand-pressure sprayer or spraying the vehicle evenly. Precautions when applying pesticides 1. Apply pesticides under suitable climatic conditions. Most of the herbicides are positive temperature coefficient agents. Do not apply pesticides at temperatures below 6°C. The best temperatures are between 10 am and 3 pm. Do not lower these temperatures before and after herbicides. Windy days can easily cause herbicides to flow, and the effect is not good. It may also be blown off to greenhouse crops or other crops to cause herbicide harm. Therefore, it is forbidden to use drugs on windy days. In addition, it is forbidden to use herbicides in frost, rain, snow, hail, cold currents and other inclement weather. Try to avoid such bad weather before and after weed killing, so we must pay attention to listening to the weather forecast. If the soil is relatively dry when using drugs, pay attention to increase the amount of water, if there is water, it will affect the efficacy of herbicides. 2. The wheat seedlings are weak and do not apply when the roots are bare. In general wheat fields will be returned to the straw, land is relatively loose, if you encounter an abnormal weather, such as warm winter drought, wheat roots may be too loose due to loose soil and can not be deep down, and even some roots may be exposed, this wheat is very It is vulnerable to frostbite and lack of water. It is the most sensitive and fragile, and it will easily cause some damage to wheat if the herbicide is used at this time. 3. Do not apply pesticide when wheat is sick. In recent years, species such as wheat sheath blight, root rot, and full-bleeding diseases have been frequently transmitted or soil-borne diseases. Before applying herbicides, determine whether your own wheat seedlings are sick. If you are sick wheat, it is best not to use herbicides. It is recommended that special seed dressings be used before wheat sowing to prevent the occurrence of diseases. 4. Be sure to double dilution. Some peasant friends figured out that the herbicides were directly poured into the sprayer and they were sprayed just after finding a branch. This kind of medicine is very unscientific. Because most of the herbicide products will have their own additives, the additives will play a role in penetration and efficiency, and are usually more viscous. If they are directly poured into the sprayer, they may sink into the bottom of the barrel, causing the phenomenon that the additive-encapsulating herbicide cannot be opened. This may lead to two consequences: one is that all the liquids have been used up and there is still a portion of the herbicide that has not yet been opened at the bottom of the barrel, resulting in waste; the other consequence is that the concentration of the herbicide in the wheat field that has just started is very small and the active ingredient Insufficient dosage, the concentration of herbicides in the later period is too large, and it is easy to form phytotoxicity. The correct preparation method is a double dilution method: first add a small amount of water to the mother liquor, and then pour it into a sprayer that contains a certain amount of water. Then add the amount of water to be added, stir it while stirring, mix thoroughly and dilute to the required concentration. Do not add water after pour the medicine first, so that the medicine is easily deposited at the suction pipe of the sprayer, so that the concentration of the liquid that is sprayed first is high, and it is easy to produce phytotoxicity. The concentration of the liquid after spraying is low, and the weeding effect is poor. It is also not allowed to pour the medicine into the sprayer containing a lot of water, so that the WP tends to float on the water meter or form a small piece, and the distribution is not uniform, which can not only ensure the effect but also easily clog the spray hole during spraying. In addition, the liquid must be prepared with clean water. 5. Avoid overdose. Some peasant friends would re-spray several times in grassy and thick areas when they were hitting herbicides, or they would waste the last remaining herbicide to hit the final plot of land. This would easily lead to herbicide harm. Because herbicides are safe for wheat at normal concentrations, if too much, wheat itself cannot break down and suffer damage. 6. Correctly consider the phenomenon of yellowing seedlings of herbicides. After some herbicides are applied, short-term yellowing of the tips of the wheat will appear. This is a normal phenomenon of seedling emergence. It usually recovers when wheat turns green. This phenomenon will not only reduce production, but will increase wheat production. It can prevent wheat from affecting its reproductive growth due to excessive nutrient growth, so it does not have to worry too much. Http://Content/3be974db-5ebe-48c2-b7b1-f8bc3fe9cfc0?cType=2 Guangzhou Zhongzhinan Supply Chain Co.,Ltd. , https://www.gzzhongzhinan.com