Although it has already been spring, the temperature is still as cold as ever, and it is particularly cautious to select herbs in the wheat field at low temperatures. So how to apply herbs in low-temperature wheat field weeding? What are the precautions? In fact, we must talk about techniques for weeding in low-temperature wheat fields. Let's take a look at it.
How to apply low temperature wheat field weeding
1. Make full use of the high temperature period.
In winter and early spring, the temperature is low, often accompanied by strong winds, which is not conducive to the efficacy of the drug, so it should be applied at a relatively high temperature during sunny days. At this time, the physiological metabolism of weeds is relatively strong, which is conducive to the conduction of the agent in the weeds, the metabolic decomposition is difficult, and it is easy to receive a good herbicidal effect.
2. Spray evenly and be patient.
The low temperature spray application of the herbicide begins to show a time effect that is significantly later than when the herbicide is used at high temperatures. For example, in rapeseed fields and vegetable fields, the use of grass can prevent bluegrass. Generally, it takes 12 to 15 days for the farmland to appear grassy, ​​and in the summer high temperature stage, the foxtail is controlled for 5 to 7 days. Will all die. Therefore, you should wait patiently after taking the medicine. As long as the timing is well grasped, the liquid medicine is sprayed into place and generally does not need to be re-medicated. The application should be strictly in accordance with the dilution factor to add water, and the amount of water should not be reduced at will. When spraying, pay attention to thoroughness, no heavy spray, no leakage, and all herbicides should be sprayed with herbicides.
3. Various application methods.
Some herbicides are mixed with soil to form toxic soil, or mixed with fertilizer to make poisonous fertilizer. It is safe to use at low temperature and the effect is relatively stable. If you use oatmeal enemy, you can mix 500 grams of oats with 50 kilograms of fine soil, sand or 7.5 kilograms of urea or 15 kilograms of superphosphate. When mixing, spray a small amount of water to make the medicine and soil or fertilizer fully adhered. Immediately after application, the soil or fertilizer is thoroughly mixed with the soil to improve the herbicidal effect.
4. Add nitrogen fertilizer to improve herbicidal effect.
When 2,4-D sodium salt is used in wheat field, ammonium nitrate, ammonium sulfate and urea are mixed, which can significantly improve the herbicidal effect of 2,4-D sodium salt. Since the addition of the fertilizer reduces the surface tension and pH of the solution, the adhesion of the agent is enhanced, thereby improving the herbicidal performance of the herbicide.
Low temperature wheat field herbicide application notes
To control grass weeds in wheat fields, common herbicides such as isoproturon and oxazolene can not be used during cold air activity. Isoproturon will reduce the cold resistance of wheat seedlings, and it is easy for the wheat seedlings to suffer from "frozen phytotoxicity". It is required that frost weather will not occur 1 week after application. Application of thioxazole in low temperature frost
Cao Ling, wheat seedlings are also susceptible to phytotoxicity, and the weeding effect will be affected. Acetyl oxalate has a wide spectrum of herbicides, wide application period, good mixedness, high safety to wheat, and temperature change does not affect safety. It can be applied from October to April, from wheat 2 leaf stage to jointing Can be applied at any time. In winter, weeding can generally achieve better results with 20% to 30 grams of 15% acetylene oxalate wettable powder per acre.
For the control of broad-leaf weeds, the herbicidal rate is slow in the low temperature period, and the mixing of 2, 4 and 4 chlorine can increase the speed of killing grass, but it is generally not recommended to apply the two when the temperature is too low (less than 5 ° C). medicine. Difluoro-oxazolidine is stable at low temperature, even if the temperature is 2 ° C, it has stable efficacy; the drug is suitable for wide application, and can be applied from late November to late January.
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