Herbicides , which are used to destroy or control the growth of weeds, are called herbicides. Herbicides can be classified according to the mode of action, the site of application, the source of the compound, and the like. According to the mode of action, it is divided into selective herbicides and quenching herbicides. According to the movement of herbicides in plants, it is divided into contact herbicides, systemic herbicides, and systemic and contact-killing herbicides. According to the chemical structure, it is classified into an inorganic compound herbicide and an organic compound herbicide. According to the method of use, it is divided into stem and leaf treatment agent, soil treatment agent, stem and leaf, soil treatment agent and the like. If the irrational use of herbicides can cause phytotoxicity, what is the cause? Xiaobian is the reason for you to summarize as follows:
1. Volatilization and drift of the herbicide droplets.
During the spraying process, the generally volatile herbicide droplets are volatilized and drifted to cause damage to nearby sensitive crops and trees. Among them, 2,4-D butyl ester is the most prominent. When used in wheat fields, the droplets can drift to 100. The distance outside the rice causes damage to soybeans, sunflowers, beets and trees.
2. Soil residues cause damage to the later crops.
Some herbicides remain in the soil for a long time, resulting in damage to the later crops. For example, when applying green huanglong in wheat, and applying Puster and chlorsulfuron in soybean, the next year, beet and rapeseed and vegetables will be severe. Victimized.
3. Improper mixing of herbicides causes phytotoxicity.
If urea herbicides such as Ligulong are mixed with phospholipid insecticides , cotton seedlings will be seriously damaged, and the enemy will harm rice after mixing with dimethoate and omethoate.
4. The application technique is not skilled.
The spray bonding belt overlaps, the nozzle leaks, etc., causing excessive local spray volume and causing crop damage.
5. Misuse, overuse and improper spraying.
6. Abnormal climatic conditions.
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