Traditional Culture Encyclopedia - Weather inquiry - What is the temperature of wild wheat herbicide?
What is the temperature of wild wheat herbicide?
It is safest to water the winter wheat for the first time for 40 days after sowing and apply herbicides. At this time, wheat is in the heart-shaped stage of 4 leaves or 4 leaves and 1, and has strong tolerance to herbicides. It is safest to apply herbicides after 4 leaves. In addition, most weeds have emerged in the 4-leaf stage of wheat, and the grass age is relatively young. Wheat has no tillers and few leaves, which makes it easier to kill weeds. At this time, the application of herbicides is the most effective.
Strictly control the temperature. Herbicides are usually marked as ready to use at 2℃ or 5℃, so do 2℃ and 5℃ refer to the temperature at use or the lowest temperature? The answer is the latter. The temperature mentioned here refers to the lowest temperature, that is to say, the lowest temperature can be used above 2℃, and it should not be lower than this temperature two days before and after application.
Drugs are forbidden in windy days. Herbicide is easy to use in windy days, and the effect is not good. It may also blow to greenhouse crops or other crops and cause herbicide damage, so it is necessary to pay attention to prohibiting the use of herbicides in windy days.
Drugs are forbidden in bad weather. It is forbidden to use herbicides in bad weather such as frost, rain and snow, hail and cold current, and attention should be paid to avoiding such bad weather before and after using herbicides. Farmers must pay attention to the weather forecast.
Do not use herbicides when the wheat seedlings are weak and the roots are bare. Generally, the straw in winter wheat field is returned to the field, and the plot is relatively loose. If the weather is abnormal, such as warm winter and drought, we must pay attention to the fact that the root system of wheat may not be deeply rooted because of loose soil, or some roots may be exposed. This kind of wheat is easy to cause frostbite and water shortage, and this kind of wheat seedling is the most sensitive and fragile. If herbicides are applied at this time, it is easy to cause some damage to wheat.
Don't use herbicides when wheat is sick. In recent years, seed-borne or soil-borne diseases such as wheat sheath blight, root rot and take-all disease have occurred frequently. Before using herbicides, farmers should determine whether their wheat seedlings are sick. If it is sick wheat, it is best not to use herbicides. It is suggested that farmers should pay attention to dressing seeds with special chemicals before sowing wheat to prevent diseases.
When using herbicides, we must pay attention to the second dilution. Some farmers want to save trouble, just pour the herbicide into the sprayer and just find a branch to stir it. This way of mixing medicines is very unscientific. Because most herbicide products will bring their own additives, which play a role in penetration and synergy, and are usually sticky, if they are directly poured into the sprayer, they may sink to the bottom of the bucket. If they are not fully stirred, it may lead to the phenomenon that herbicides cannot be dissolved by additives, which may lead to two consequences. One is that all drugs are used up, and some herbicides have not dissolved in the bottom of the barrel, resulting in waste; Another consequence is that the herbicide used in the wheat field is light at first and heavy at last. Therefore, we must pay attention to the secondary dilution when using herbicides.
Herbicide must be used in strict accordance with regulations to avoid excessive use. Some farmers will spray herbicides several times in dense grass, or they will finish the last herbicide in the last field for fear of waste. This is very easy to cause herbicide damage, because herbicide is safe for wheat at normal concentration, but if it is used in excess, wheat itself cannot be decomposed, which will cause harm to wheat.
Correctly treat the yellowing and squatting of herbicides. After some herbicides are used, wheat leaves will turn yellow in a short time, which is a normal phenomenon of squatting seedlings. Generally, when wheat turns green, it can recover itself. This phenomenon will not reduce production, but will promote wheat production and prevent wheat from affecting its reproductive growth due to excessive nutritional growth, so farmers don't have to worry about this phenomenon.
I wish you a bumper harvest next year.
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