After planting of winter wheat 40 days after the completion of pouring hooded water (first water) after playing the safest herbicide, this time value wheat leaf 4 or 4 leaf stage, are more tolerant to the herbicide, herbicidal play after 4 leaf The agent is the safest. In addition, when the wheat 4 leaves stage, most of the weeds have been released, and the grass age is relatively small, the wheat has no tillers, and there are not many leaves, it is easier to kill the weeds. At this time, the herbicide is most effective. So what are the precautions for spraying wheat herbicides? 1. Strictly control the temperature. Herbicides are generally labeled at 2 ° C or can be used at 5 ° C. So what is the temperature at 2 ° C and 5 ° C, which is the temperature at the time of use or the lowest temperature? The answer is the latter. The temperature mentioned here refers to the lowest temperature, that is, the lowest temperature can be used above 2 ° C, and the temperature should not be lower than the temperature before and after the herbicide. 2. It is forbidden to use medicine on windy days. It is easy to cause the herbicide to float when it is used in windy days. If the effect is not good, it may blow up to the greenhouse crops or other crops to cause herbicide damage. Therefore, it is necessary to pay attention to the prohibition of medication on windy days. 3. It is forbidden to use drugs in bad weather. It is forbidden to use herbicides in bad weather such as frost, rain, snow, hail, cold current, etc. It is also necessary to pay attention to the bad weather before and after herbicides. Farmers must pay attention to the weather forecast. 4. Do not use herbicides when the wheat seedlings are weak and the roots are bare. Generally, winter wheat fields will be returned to the field, and the land will be loose. If there is an abnormal weather, such as a warm winter drought year, it must be noted that the root system of wheat may be too loose due to the soil being too loose, or some roots may be bare, so that Wheat is easy to cause frostbite and water shortage. Such wheat seedlings are the most sensitive and fragile. If herbicides are used at this time, it will cause some damage to wheat. 5. Do not use herbicides when the wheat is sick. In recent years, wheat sheath blight, root rot, total eclipse and other species or soil-borne diseases frequently occur. Farmers' friends use herbicides to determine if their own wheat seedlings are sick. If it is sick wheat, it is best not to use weeding. Agent. It is recommended that farmers' friends must pay attention to the use of special pesticides before planting wheat to prevent the occurrence of diseases. 6, the use of herbicides must pay attention to the second dilution. Some farmers' friends can save the herbicide directly into the sprayer, just find a branch and stir it. This method of redemption is very unscientific. Because most herbicide products carry their own auxiliaries, the auxiliaries act as osmotic synergists. They are usually viscous. If they are poured directly into the sprayer, they may sink to the bottom of the bucket. If not fully stirred, it may cause help. The agent can not be opened by the herbicide, which may lead to two consequences: One is that the medicines are all finished, and some of the herbicides are not opened at the bottom of the barrel, causing waste; Another consequence is that the herbicides in the wheat field that were just started are very light, and the herbicides that are finally hit are very heavy. Therefore, the use of herbicides must pay attention to the second dilution. The correct preparation method is the second dilution method: first add a small amount of water to the mother liquor, then pour into a sprayer containing a certain amount of water, then add the amount of water to be added, and stir while mixing, and mix thoroughly to the required concentration. Do not pour the medicine into the potion first, so that the medicine is easily deposited in the suction pipe of the sprayer, so that the concentration of the first sprayed liquid is high, and it is easy to cause phytotoxicity. The concentration of the liquid sprayed later is low, and the herbicidal effect is poor. Also, do not pour the medicine into a sprayer containing a large amount of water, so that the wettable powder tends to float on the water meter or form a small piece, and the distribution is uneven, which not only does not guarantee the effect but also easily blocks the spray hole when sprayed. In addition, the liquid should be prepared with clean water. 7. Herbicides must be used strictly in accordance with regulations to avoid excessive use. Some farmers’ friends will spray a few times in grassy places when they are fighting herbicides, or they will be afraid to waste the last remaining herbicides on the last plot. This is a very easy way to cause herbicide damage. Because herbicides are safe for wheat at normal use concentrations, if used in excess, the wheat itself cannot be broken down, causing damage to the wheat. 8. Correctly treat the phenomenon of yellowing seedlings of herbicides. After some herbicides are used, wheat will have a short yellow tip, which is a normal seedling phenomenon. It usually recovers when the wheat is green. This phenomenon will not cause the production to decrease, but will increase the yield of wheat. It can prevent wheat from affecting its reproductive growth due to excessive nutrient growth, so farmers do not have to worry about this phenomenon. 9. Strictly control the temperature. Finally, I would like to remind you that the wheat weeding should pay attention to the weather temperature and humidity. When using the medicine, the average temperature should be higher than 6 degrees, and it is best from 10:00 am to 3:00 pm. If the soil is relatively dry, pay attention to increase the water. The amount, if there is water, will affect the efficacy of wheat herbicides. More pesticide knowledge , please pay attention to China Pesticide Network Solar Street Lamp,Solar Street Light,Solar Led Street Light,Solar Panel Street Light Guangdong Smart Street Lighting Co., Ltd , https://www.gdfldlight.com