Can wheat be weeded at low temperatures? The effect is good above 10°C

AbstractIt is best not to use wheat herbicides when the temperature is low. Applying the herbicide at this time will not only affect the weeding effect, but also cause herbicide damage. The more suitable temperature is above 10°C. The higher the temperature, the better the weeding effect. Therefore, it is recommended to choose a sunny day and apply it from 10 a.m. to 15 p.m.

1. Can wheat herbicides be used at low temperatures?

1. Most growers know that wheat herbicides have relatively high temperature requirements. If the temperature is too low, it will affect the weeding effect and also cause herbicide damage, so everyone must pay attention when using them. If the herbicide label states that 2°C is sufficient, or that 5°C is sufficient, that means it can be used when the temperature is above the labeled degree. Even so, try to choose a time when the temperature is higher, at least above 10°C.

2. For wheat sown in early to mid-October, spraying herbicide can generally be done when the wheat has grown 3-5 leaves, roughly around early to mid-November. The temperature at this time is relatively high, around 20°C, which is more conducive to the herbicide taking effect.

3. If the wheat is sown relatively late, then by the time the wheat reaches the 3-5 leaf stage, that is, the end of November or early December, many winter wheat planting areas have already begun to cool down. For example, in Henan, the temperature at this time is between minus 1°C and 7°C, and it will be accompanied by light rain. This time is not suitable for spraying wheat herbicides.

4. According to many years of planting experience, when the noon temperature is greater than 10°C, it is suitable for spraying wheat herbicides. The higher the temperature, the better the effect. Basically, in winter wheat planting areas, high temperatures of 30°C are unlikely to occur at this time. If looking at the average temperature, the average temperature in a day should be greater than 6°C. The higher the temperature, the better. Basically, high temperatures are unlikely to occur in wheat planting areas.

2. Timing for controlling wheat weeds

1. The best weeding period is during the wheat seedling stage, roughly mid-to-late November, and during the green-up stage from the end of February to early March.

2. During the wheat seedling stage, the weeds are younger and have lower resistance to the chemicals, making them easier to control. A smaller amount can remove the weeds.

3. During the green-up stage, the weeds are older and have stronger resistance to the chemicals, so the amount used needs to be increased, which also raises the cost of the chemicals.

3. Precautions for using herbicides

1. It is recommended to spray the chemicals on a sunny day, after 10 a.m. or before 15 p.m. If the soil is dry, irrigate promptly before applying the chemical.

2. Spraying should be done on a windless day, which can both ensure the effectiveness of the herbicide and avoid herbicide damage.

3. When applying the chemical, be sure to pay attention to temperature changes. Because herbicides need a certain amount of time to take effect, in order to better ensure the effectiveness, check the weather forecast before applying. It is best if there is no rainfall within a week.

4. When applying the chemical, the solution must be mixed evenly. During application, do not spray repeatedly or miss spots, so as to ensure the weeding effect.