The recent weather is fickle, first the sun is shining, and the snow is lingering; in winter and early spring, the growth of crops and weeds is slow, but the growth rate and growth of weeds are faster than crops. Therefore, it is necessary to carry out chemical weeding on winter crops. However, the effect of using herbicides in low temperature seasons is not as obvious as the seasons with high summer and autumn temperatures, and sometimes there is no certain effect in the short term. The main reason is that due to low temperature conditions, the release of herbicides is poor. On the other hand, due to the weed ability of weeds, the absorption capacity of the weeds is also reduced, and the medicament is slowly absorbed and decomposed by the weeds, so that the effect is reduced or even completely ineffective. In order to improve the use of herbicides, in addition to the choice of herbicides on the road, the pesticide network Xiaobian technically summarized the following skills:
1. Weather. 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. Apply evenly. Dosing should be done strictly in accordance with the dilution factor, 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. Choose a variety of ways to use. 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 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. ( Chinese pesticide network finishing)
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