How to improve the weeding effect of herbicides?

1. Choosing the right herbicide Because each herbicide has a certain herbicidal spectrum, it is destructive and selective. Therefore, according to the crop species and the main varieties of weeds, effective herbicides should be selected. At the same time, herbicides should be selected according to the farming system. In addition, pay attention to mixing and alternate use of herbicides. Since the same herbicide has been used continuously for many years, it is easy to cause the sensitive weeds to gradually decrease and the resistance-resistant weeds to rise. Therefore, the herbicides should be mixed and used alternately during the year to achieve the long-term control of grass damage.

2. Choosing the best period of application According to the nature of the herbicide, the period of weed occurrence, weeds and the growth period of the crop, the drug is selected. There are many varieties of herbicides, such as stem and leaf treatment agents, soil treatment agents, contact herbicides, and herbicides, some for pre-emergence weeding, and some for stem and leaf weeding. The soil treatment is to spray the herbicide directly on the soil to kill the weeds that have just sprouted. For example, Duer, acetochlor should be used before the weeds are unearthed after the crops are planted. When the weeds are used after emergence, not only the effect is poor, but also the crops are damaged. Therefore, it is important to apply the herbicide at the optimum time.

3. The use of herbicides is proportional to the temperature. When the temperature is high, the weeds have a strong function of absorbing and transporting the herbicide, and the herbicide has high activity, and it is easy to exert the herbicidal action at the action site of the weeds. The test results show that the higher the temperature of air and soil is, the more effective the herbicide is, especially the herbicidal effect of stem and leaf treatment herbicide can be greatly improved, and the use of herbicide under low temperature conditions. The effect will not only be significantly reduced, but the detoxification effect of the crops in the crops will be slower due to the low temperature, which is easy to induce phytotoxicity. The temperature of applying the herbicide is preferably 20~35 °C, and the effect of air humidity on the herbicide is also effective. The effect is obvious. When the air and humidity are relatively large, the application of the herbicide herbicide can prolong the residence time of the herbicide on the weed leaf surface, and help the weed leaf surface to open, thereby absorbing a large amount of herbicide and improving For the purpose of weeding effect, after the soil treatment herbicide is absorbed, it will be transported upward with a large amount of water, which is beneficial to inhibit photosynthesis and can significantly improve the herbicidal effect. Therefore, when the herbicide is used, the greater the humidity of the air, the more obvious the herbicidal effect; on the contrary, the herbicidal effect is lowered.