Causes of Herbicide Damage
No crop has absolute patience or resistance to herbicides, and the selectivity of all herbicides to crops and weeds is also relative. Only when certain environmental conditions and proper use of technology are available can the full range of herbicides emerge. Selectivity without harming crops. In the large area of ​​herbicides used, crops produce a variety of reasons for injury, some of which can be avoided, and some are difficult to avoid.
The droplets volatilize and drift highly volatile herbicides. During the spraying process, the droplets of the Chinese medicine liquid are easily volatilized and drift, resulting in the damage of neighboring sensitive crops. The larger the pressure of the atomizer, the finer the droplets, the easier it is to drift. In particular, 2,4-D-butyl phthalate is the most serious and prominent, and its droplets can drift from 1000 to 2000 meters when spraying on the ground. For the volatile herbicides, there is not only the problem of drift, but also the drug liquid continuously evaporates during the period after the application of pesticides, and the phytotoxicity continues to occur.
Soil residue
Herbicides with long persistence and long residual time in the soil are prone to injury to sensitive backlogged crops in rotation crops. For example, simazine or atrazine in corn fields may cause harm to crops such as sugar beets and wheat. ; Soybean field application of chlorpromazine, Pu Shite, there is phytotoxicity on the late glutinous wheat.
Misuse of different herbicides and misuse of herbicides and insecticides, fungicides, and other pesticides can also cause phytotoxicity. Here are some mixed methods: First, the herbicide range of the two herbicides should be different; second, the quick-acting agent should be mixed with the delayed agent; the long-acting agent should be mixed with the short-acting agent; Diffusion and migration agents in the soil should be mixed with diffusible and less mobile agents. Fourth, the use of the two agents must be consistent with the method.
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