With the widespread use of herbicides, there are more and more problems in production. Many people only pay attention to the special effects of herbicides and increase the dosage at will, but they ignore the timing and methods of use. The basic principle of herbicide weeding is the selective removal of weeds from the time, location, morphological and physiological differences between different plants. Therefore, the use of herbicides should be well controlled in terms of drug selection, timing, and application method. Select drugs
There are hundreds of commonly used herbicides, but their characteristics and control targets are often different. Weeds are different from the one-year and perennial, but also broad-leaved and grassy; different crops and even different varieties of the same crop and different growth periods The sensitivity to the same herbicide is also very different. Therefore, the first step in the rational use of herbicides is to choose the right medicine. For example, in the spring, in addition to the treatment of wheat field weeds, 2,4-D butyl ester or iso-octyl ester, the best effect of Lai Li, but the poor efficacy of leek, swine fever and other drugs, preferably in combination with other agents; Pyridoxine has a more prominent effect on sowing wormwood and field bindweed. When you choose
The first consideration is the safe and efficient use of the herbicide in which stage of the crop, such as most wheat field herbicides are used when about 3 leaves of the weed before the jointing of wheat. Therefore, weeding before spring and early spraying in spring are the two most suitable time periods for herbicides in wheat fields. The efficacy and temperature of most herbicides, especially the conductive herbicides, are suitable for the rapid growth of weeds. Under the medication, weeds can be absorbed into more medicines, and the efficacy of drugs can be better. For example, in the wheat field in spring, the use of herbicides, and the choice of weather that is sunny and breezy will benefit both the efficacy and the safety of wheat.
Place in place
Whether it is a contact-killing herbicide or a conductive herbicide, only the adherence to or absorption of a sufficient amount of an agent can exert its effect. Therefore, the application of herbicides is also very important. In recent years, many of the problems that reflect poor efficacy or even occurrence of phytotoxicity are mostly due to the fact that only the increase in the amount of the drug is taken into consideration and the amount of liquid sprayed is reduced, resulting in a very uneven distribution of the liquid and the drug that falls on the weeds. There are few fluids and there are many stains on the crops, which can lead to weeds not being able to die and the consequences of crop damage. Therefore, when applying herbicides, it is necessary to ensure sufficient amount of liquid medicine.
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