When is the best time for weeding winter wheat? What are the points for attention? Collect these 9 suggestions!

The regional distribution of winter wheat in China is much wider than that of spring wheat, and the proportion of yield is also very high. generally, winter wheat can be sown from mid-late September to early October and mature from the end of May to late June next year. In the process of planting, when is the best time to weed winter wheat? What are the points for attention? Collect these 9 suggestions!

When is the best time for weeding winter wheat

After sowing and watering winter wheat for 40 days, it is the safest time to apply herbicides. At this time, wheat is in the stage of 4 leaves or 4 leaves and one heart, and the tolerance to herbicides is higher. Moreover, in the 4-leaf stage of wheat, most weeds have appeared, but the grass age is relatively young, wheat has no tillers, and there are not many leaves, so it is easy to kill weeds. At this point, herbicides are the most effective.

II. Matters needing attention in weeding winter wheat

1. Strict temperature control

The instructions for the use of herbicides are generally marked as 2 ℃ or 5 ℃, but many people do not understand whether the 2 ℃ or 5 ℃ mentioned here refers to the temperature or the lowest temperature.

The answer is actually the latter, where the temperature refers to the lowest temperature, which means that the lowest temperature can only be used above 2 ℃, and must not be lower than that temperature for at least two days before and after herbicide application.

2. Drug use is prohibited in windy days

Herbicide drift can easily be caused by medication in windy days. If it is not effective, it may also be blown to other crops by the wind, causing drug damage to other crops. Therefore, attention must be paid to forbidding the use of herbicides in windy days.

3. Drug use is prohibited in bad weather

The use of herbicides in severe weather such as frost, rain and snow, hail and cold snap is prohibited, and such bad weather must be avoided before and after the use of herbicides. Farmers must pay attention to the weather forecast.

4. Do not use herbicides when the land is loose.

In general, the winter wheat field will return straw to the field, and the plot is relatively loose. In warm winter and less precipitation years, the roots of wheat may be too loose to take root, or some of the roots may be exposed to the surface. This can easily cause frostbite and water shortage of wheat, and if herbicides are used at this time, it is easy to cause damage to fragile wheat.

5. Do not use herbicides when there is a disease.

In recent years, wheat sheath blight, root rot, total erosion and other seed-borne or soil-borne diseases have occurred frequently. Farmers first make sure that their wheat seedlings have these diseases before using herbicides. If so, it is best not to use herbicides.

6. The herbicide should be diluted twice before it is used.

Some farmers just pour the herbicide directly into the sprayer and stir it casually. This way of exchanging the herbicide is very unscientific. Because most herbicide products will bring their own auxiliaries, auxiliaries play the role of penetration and synergism, usually sticky. If you pour it directly into the sprayer, it may sink into the bottom of the barrel, resulting in the illegal opening of herbicides wrapped in auxiliaries. there are only two consequences: one is that all the drugs have been injected, and some of the herbicides have not melted at the bottom of the barrel, resulting in waste; another consequence is that the herbicide in the wheat field is very light at the beginning, but the herbicide is very heavy in the end. Therefore, the use of herbicides must pay attention to secondary dilution.

The correct preparation method is the secondary dilution method. First, add a small amount of water to the mother liquor, then pour it and a certain amount of water into the sprayer, then add the amount of water to be added and stir until it is diluted to the desired concentration.

Do not pour the medicine first and then add water, so that the medicine is easy to deposit in the suction tube of the sprayer, so that the concentration of the liquid ejected first is high, and it is easy to cause drug damage. Do not directly pour a large amount of water into the sprayer filled with the medicament, so the powdered medicament often floats on the water meter or forms small pieces, which is extremely uneven. Not only can not guarantee the effect, but also easy to block the nozzle when spraying. In addition, the liquid should be prepared with clean water.

7. Herbicides must be used in strict accordance with the regulations to avoid overuse

Some farmers will spray a few times on the thick grass when they hit the herbicide, or they are afraid of wasting the last remaining herbicide into the last plot, which can easily lead to herbicide damage. Because herbicides are safe for wheat at normal concentrations, but if overused, the wheat itself cannot decompose, causing damage to the wheat.

8. It is normal to yellowing squatting seedlings of wheat after herbicide treatment.

After the use of some herbicides, wheat will appear short-term leaf tip yellowing, which is a normal squatting phenomenon, which can generally recover when the wheat turns green, this phenomenon will not cause a reduction in yield, but can promote an increase in wheat production. So farmers don't have to worry about this phenomenon.

9. Strictly control the temperature

Finally, we need to pay attention to the weather temperature and humidity of wheat weeding. When using drugs, the average temperature should be higher than 6 degrees Celsius, preferably between 10:00 and 3 p.m. If the soil is relatively dry, we should pay attention to increasing water consumption. If there is stagnant water in the soil, it will affect the efficacy of wheat herbicides.

Therefore, in the application of wheat herbicides, we should seize the opportunity, consider many aspects, and use the herbicides in time to lay the foundation for the high yield of wheat. After wheat sowing and emergence, a series of management will also begin, and weeds in the wheat field must be removed early, so this knowledge should be used immediately, and it is good to collect it in advance.