Atrazine's mixed formulation is one of the most commonly used herbicides for controlling weeds in corn fields due to its moderate cost, ease of use, good weed control effect, and no effect on corn growth. According to the survey, more than 95% of the corn fields in our county use similar mixed formulations. However, in recent years, such mixed preparations have caused an increase in the occurrence of phytotoxicity in dicot crops, especially in cotton and vegetables. Phytotoxicity occurs not only in neighboring crops, but also in courtyard crops, causing great concern in the agricultural sector. Observed that after the damage of cotton, vegetables and other dicotyledonous crops, the main symptoms are as follows: leaf edges are curled and dry, leaves are twisted, leaf color is abnormal, generally occurs in early June and mid-June, at this time it is the end of wheat harvest, interplanting corn and The peak season of chemical weeding in summer corn fields. According to the survey, the reasons for frequent victimization of cotton and vegetables are mainly in two aspects: First, the layout of crops is irrational. Pesticides often occur in corn adjacent to double-leaf crops such as cotton and vegetables. Take cotton as an example. At this time, the cotton plants are small and have poor drug resistance. After exposure to liquid chemicals, they are prone to phytotoxicity. The second is caused by climate factors. If you encounter windy weather when using Atrazine mix, it will often lead to drift of the liquid, coupled with incorrect spraying methods, aggravating the degree of occurrence of injury. Therefore, in the use of atrazine mixes, if corn and dicotyledonous crops can not be avoided adjacent to planting, it should be as far as possible to choose the windless weather drug, and in the spray as much as possible to reduce the nozzle to prevent the liquid drift . This will not only reduce the waste of pesticides, but also help improve the weeding effect.
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