It is obvious that the weather is cold in winter, often accompanied by strong winds, which is not conducive to the effect of the drug. Therefore, it should be applied at a time when the temperature is relatively high on sunny days. After the scientific use of the medicine into the winter, the growth of crops and weeds is relatively slow, but relatively, the growth rate and growth of weeds are faster than the crops. Therefore, it is necessary to carry out chemical weeding on winter crops. However, when the herbicide is used at low temperatures in winter, the effect is not as obvious as the season of high summer and autumn temperatures, and sometimes it will not be seen in a short period of time. The main reason is that the herbicide is used on the one hand under low temperature conditions. The effect release is poor. On the other hand, the weeds absorb it and are slowly absorbed and decomposed by the weeds, which reduces or even completely fails. Therefore, the use of herbicides at low temperatures, in addition to the choice of herbicides on the road, technically should also master the following points. At this time, the physiological metabolism of weeds is relatively strong, which is beneficial to the conduction of the agent in the weeds, and the metabolic decomposition is difficult, and it is easy to receive a good herbicidal effect. If you enter December, the wheat field is controlled by weeds, it is basically difficult to kill weeds, especially the use of herbicides such as isoproturon. If the temperature is too low, it should not be used. It should be postponed until the end of February or early March of the next year. When the temperature rises, according to the growth of weeds in the field, use appropriate herbicides to control them. The application of pesticides should be thoughtful and evenly used in the high temperature period in winter. Some weeds are blocked by growth and eventually die, but low-temperature weeding has no such effect, and we cannot rely on the pesticide to kill the weeds. Therefore, the application of the drug should be 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. With a certain amount of patience to use herbicides in winter and low temperature seasons, the time to start showing efficacy 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. Choose a variety of methods. Some herbicides are mixed with soil to make toxic soil, or mixed with fertilizer to make poisonous fertilizer. It is safe and effective in low temperature seasons. If you use oatmeal enemy, you can mix 500g oats with 50kg of fine soil (sand) or 7.5kg of urea or 1.5kg of superphosphate. When mixing, spray a small amount of water to make the medicine and soil or fertilizer fully adhere. Immediately after application, the soil or fertilizer is thoroughly mixed with the soil to improve the herbicidal effect. Adding 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. Because the fertilizer is added, the tension and pH of the surface of the solution are lowered, and the adhesion of the agent is increased, thereby improving the herbicidal performance of the herbicide. Flat washers are usually thin pieces of various shapes to reduce friction, prevent leakage, isolate, and prevent loosening or dispersion of pressure. These components are found in many materials and structures to perform a variety of similar functions. Due to the material and process limitations of threaded fasteners, the supporting surface of bolts and other fasteners is not large, so in order to reduce the pressure stress of the bearing surface to protect the surface of the connected piece, the Washer is used. Galvanized Spring Washer,Flat Washers,Din127 Spring Washer,Thickened Spring Washer Handan Changlan fasteners manufacturing ,.Co ltd , https://www.hdchanglanjgj.com