Three key points for herbicides to be effective should be kept in mind

With the wide application of herbicides, there are more and more problems in production. Many people only pay attention to the specific effects of herbicides and increase the dosage at will, but ignore the timing and method of use. The basic principle of herbicide weeding is to selectively eliminate weeds from time, position, morphological differences and physiological differences between different plants. Therefore, the use of herbicides in the selection of drugs, timing, application methods on the three links should be well grasped. Choose the right medicine There are hundreds of commonly used herbicides, but their characteristics and control objects are often different; weeds have annual and perennial differences, but also broadleaf and grass; different crops and even different varieties of the same crop and different growth stages have different sensitivities to the same herbicide. Therefore, the first step in the rational use of herbicides is to choose the right medicine. For example, in spring, in addition to wheat field weeds, 2,4-D butyl ester or isooctyl ester has the best effect on falling Li, but it has poor efficacy on shepherd's purse, catnip, etc., and it is best to use it in combination with other medicaments; Chlorfluroxypyr has more prominent effects on sowing Artemisia annua and field convolvulus. When choosing a good time First of all, consider at which stage of crop growth the herbicide is safe and effective. For example, most wheat herbicides should be used when the weed has about 3 leaves before wheat jointing. Therefore, weeding before winter and spraying as early as spring are the two most suitable periods of application of herbicides in wheat fields; the efficacy of most herbicides is related to temperature, especially systemic conductive herbicides. Under the temperature conditions suitable for rapid growth of weeds, weeds can absorb more pesticides and exert better efficacy. For example, when using herbicides in wheat fields in spring, choosing sunny, warm and breezy weather is not only conducive to the exertion of the efficacy, but also safer for wheat. put into place Herbicides, whether contact or systemic, are effective only when they are attached to or absorbed in sufficient quantities. Therefore, in the application of herbicides, whether they can be applied in place is also very important. In recent years, many of the problems reflecting poor efficacy or even phytotoxicity are mostly due to only increasing the dosage of chemicals and reducing the amount of liquid medicine sprayed, resulting in very uneven distribution of liquid medicine, less liquid medicine falling on weeds and more on crops, thus leading to the consequences of weeds not dying and crops suffering from phytotoxicity. Therefore, when applying herbicides, it is necessary to ensure sufficient liquid medicine.