Guangzhou Yuquan Composite Material Co., Ltd , https://www.klyqfilm.com
2. Improper application method. Perennial application of a single herbicide with a long residual period, such as simazine, may cause phytotoxicity to the sorghum vegetables; application of herbicides by pouring or watering, often caused by local concentration of the medicinal solution; Insufficient cleaning, sprayers that have used herbicides, have not been thoroughly cleaned, and used to spray insecticides or other chemicals, often causing "secondary phytotoxicity" in vegetables.
3. The medication object is wrong. Herbicides have strong selectivity, and their control objects have a certain range. Once they are used incorrectly, they will cause phytotoxicity. For example, 2,4-D drops are mainly used for the control of monocotyledonous weeds. If used on dicotyledonous vegetables such as melons, phytotoxicity will occur.
4. The medication time is wrong. Herbicides have a strict application period, and timely application of pesticides is the key to the application of herbicides. Some herbicides are only used for pre-sowing soil treatment, some can be used for pre-emergence treatment, and others can be used for seedling treatment, and can not be used arbitrarily, otherwise it is easy to cause phytotoxicity.
5. Environmental conditions are not suitable. The application of herbicides requires certain environmental conditions. The temperature is too high or too low, and it is easy to cause phytotoxicity when it is windy and heavy.
Reasons for chemical herbicide damage in vegetable fields
1. The dosage is too large. The amount of herbicide used is strictly regulated and the appropriate amount of application must be determined prior to use. The same herbicides in different regions, or in different seasons in the same region, or under different soil conditions, different weeds, different vegetables or the same growth period of the same vegetable, the application rate is not the same.
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