Any crop does not have absolute tolerance or resistance to herbicides, and all herbicide varieties are relatively selective for crops and weeds. It can only be manifested when certain environmental conditions and correct use techniques are available. Selective without harming the crop. In the large-scale use of herbicides, there are many reasons for crop phytotoxicity, some of which can be avoided, and some are difficult to avoid.
The mist floats and floats high-volatility herbicides. During the spraying process, the liquid droplets are extremely volatile and drifting, causing damage to nearby sensitive crops, and the greater the pressure of the sprayer, the finer the droplets, and the easier it is to drift. In particular, 2,4-butyl butyl ester is the most serious and outstanding, and its droplets can drift 1000-2000 meters when sprayed on the ground. For volatile herbicides, there is not only a drift problem, but also the liquid medicine is constantly volatilized for a period of time after application, and phytotoxicity continues to occur.
Soil residue
Herbicides with long-lasting and long-lasting residues in the soil are likely to cause damage to crops that are sensitive to crop rotation, such as simazine or atrazine in corn fields, and phytotoxicity to crops such as sugar beet and wheat. Soybean field application of chlorhexidine, Pu Shite, medicinal damage to the post-glutinous wheat.
Improper mixing of different herbicides and herbicides mixed with other pesticides such as pesticides and fungicides can also cause phytotoxicity. The following describes several mixing methods: First, the herbicidal range of the two herbicides should be different; second, the quick-acting agent should be mixed with the delayed agent, and the long-acting agent should be mixed with the short-acting agent; Agents that are diffuse and mobile in the soil should be mixed with agents that are diffuse and mobile; fourth, the period and method of use of the two agents must be consistent.
The mist floats and floats high-volatility herbicides. During the spraying process, the liquid droplets are extremely volatile and drifting, causing damage to nearby sensitive crops, and the greater the pressure of the sprayer, the finer the droplets, and the easier it is to drift. In particular, 2,4-butyl butyl ester is the most serious and outstanding, and its droplets can drift 1000-2000 meters when sprayed on the ground. For volatile herbicides, there is not only a drift problem, but also the liquid medicine is constantly volatilized for a period of time after application, and phytotoxicity continues to occur.
Soil residue
Herbicides with long-lasting and long-lasting residues in the soil are likely to cause damage to crops that are sensitive to crop rotation, such as simazine or atrazine in corn fields, and phytotoxicity to crops such as sugar beet and wheat. Soybean field application of chlorhexidine, Pu Shite, medicinal damage to the post-glutinous wheat.
Improper mixing of different herbicides and herbicides mixed with other pesticides such as pesticides and fungicides can also cause phytotoxicity. The following describes several mixing methods: First, the herbicidal range of the two herbicides should be different; second, the quick-acting agent should be mixed with the delayed agent, and the long-acting agent should be mixed with the short-acting agent; Agents that are diffuse and mobile in the soil should be mixed with agents that are diffuse and mobile; fourth, the period and method of use of the two agents must be consistent.
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