Wheat is an important field crop in China. Therefore, weeding in wheat fields has also attracted people's attention. When is the best effect on wheat field herbicides ? The following is a brief introduction to the best application time of wheat field herbicides.
When does the wheat field herbicide hit?
The optimal period of use is the wheat tiller before winter and the early stage of wheat jointing in the second year. These two times have better control effect on the drug, and it is relatively safe for wheat. If it is late, the effect is poor. Among them, the earlier the 2,4-D butyl ester is used, the better the benzosulfuron is before the wheat turns green. Use best to avoid phytotoxicity to the next crop.
To herbicides on wheat, not only must master the time, but also the temperature and humidity when using the drug: the average temperature of the herbicide should be above 6 °C, which will achieve very good control effect. In addition, herbicides should be used on sunny days and when the temperature is slightly higher, generally from 10:00 am to 3:00 pm. If the land is dry and sprayed with herbicides, the water consumption should be increased to ensure the control effect.
Humidity should also be well grasped: grasp the timing of watering the wheat field, timely apply the medicine to ensure the efficacy of the herbicide. Most herbicides require a certain amount of soil moisture, and the soil moisture is 40%-60%. Conducive to the efficacy of herbicides. Drought is serious, and the herbicide should be used in a timely manner after the use of watering (or after rain).
Wheat field herbicide use points
First, choose the correct herbicide variety
Although there are many varieties of herbicides, farmers must choose the most suitable weeds according to the most weed species in the wheat field to receive the desired results.
Second, choose the best time to apply
Some farmers choose the time to use herbicides in the wheat field in the spring, and wait until the grass age and density of the weeds are applied. At this time, the weeds are older, the drug resistance is enhanced, and the dose must be increased during the prevention and treatment, which increases the cost and easily causes phytotoxicity to the wheat and the sorghum and adjacent crops. Therefore, it is strongly recommended to take medicine before winter.
Third, master the temperature and humidity of the application
1. Master the temperature at the time of application.
The temperature of the application directly affects the effect of the herbicide. The herbicide used in the wheat field should be applied when the temperature is high on a sunny day to fully exert the efficacy.
2. Ensure that the soil moisture is sufficient when applying the medicine. Whether it is the application of soil before the emergence of wheat or the application of wheat during the growing season, soil moisture is an important factor affecting the efficacy. When the seedlings are applied before the seedlings, if the soil moisture of the topsoil is large, it is easy to form a strict sealing layer of the soil, and the weed seeds are germinated and quickly released, so the control effect is high. When the wheat is applied in the growing season, if the soil is moist, it is beneficial to the weeds to absorb the herbicides and operate in the body, so the effect of the drug is fast and the herbicidal effect is good.
Fourth, master the amount of herbicide
Weeds and wheat are both plants, and the selectivity of herbicides is limited. To ensure that herbicides kill both weeds and wheat, we must strictly control the amount of herbicides, neither increase nor decrease. Use the dosages described in the instruction manual and adjust to local conditions.
5. Master herbicide spraying technology
When using herbicides, be sure to dilute enough water and mix well. To achieve uniform spraying, no heavy spray, no leakage. If adjacent plots are sensitive crops of herbicides, isolation measures should be taken to prevent the crops of adjacent plots from being damaged if there is wind. It is best to use herbicide-spraying equipment to prevent crop damage when spraying other pesticides . If the medicine does not have special conditions, after spraying the herbicide, it must be washed repeatedly with bleaching powder before it can be used to control crop pests and diseases.
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