If the herbicide is used improperly, it is easy to cause phytotoxicity problems. What should we do? To alleviate the phytotoxicity of herbicides, we must first distinguish the type of phytotoxicity, and then analyze and analyze the causes of phytotoxicity, and finally find a reasonable way to alleviate phytotoxicity. Let's take a look at it below.
1, the phytotoxicity is lighter
Use an antidote. For example, naphthalene anhydride and R-28725 are selective seed dressing protectants that can be absorbed by seeds and inhibit the damage of herbicides to crops in roots and leaves. These drugs can protect corn from acetochlor, butachlor, etc. Herbicide damage.
Spray with water. When the application amount of the herbicide is too large, detoxification should be taken as soon as the phytotoxicity occurs or will occur. When the phytotoxicity occurs in the rice field, the toxic field water should be drained immediately, and the fresh water should be continuously irrigated for 3 to 4 times. It can also be combined with irrigation and drainage to apply lime powder (20-30 kg/mu) in the field to neutralize the acidic herbicide and continuously flush with water. Among them, the soil treatment agent phytotoxicity, in principle, does not use flood irrigation; the stem and leaf treatment agent can be properly irrigated. If the herbicide is caused by spraying a herbicide on the foliage and the plant, you can quickly spray the surface of the damaged crop with a large amount of water, spray the water twice or three times, and brush off the drug on the surface of the plant as much as possible. Increase the application of phosphorus and potassium fertilizer, cultivating loose soil, and promoting root development to enhance crop recovery.
2, local phytotoxicity
If the phytotoxicity occurs locally, it can be rinsed or deeply ploughed, then the seedlings are added and the appropriate amount of quick-acting nitrogen fertilizer is added.
The affected plots can be exposed to sunlight for 3 to 5 days, then rinsed with water or heavy rain, and then ploughed for 15 to 20 days before planting other crops.
Apply fast-acting, high-quality foliar fertilizer or plant growth regulators. On crops where phytotoxicity occurs, quick-acting fertilizers such as urea or sprayed foliar fertilizer can be applied to increase nutrients, promote crop growth and enhance self-recovery ability; spray plant growth regulators gibberellin, alizarin lactone, complex Sodium nitrophenolate, love more than harvest.
Use a safe protective agent properly. Activated carbon and the like have a good degradation effect on herbicides such as simazine. For example, using activated carbon to package seeds such as corn can reduce or prevent the phytotoxicity of herbicides such as alachlor, 2,4-D butyl ester and lyuron on corn. When sowing, the surface of the soil is sprinkled with activated carbon powder of 10 kg/mu, or the activated carbon powder is partially applied to the crop, which can prevent simazine from causing phytotoxicity to cucumber, wheat, soybean and the like.
Remove the site where the phytotoxicity is more serious. This kind of measure is commonly used in fruit trees. The branches with heavy damage should be quickly removed to prevent the drug from continuing to conduct and penetrate downwards, and to quickly irrigate the water to prevent the phytotoxicity from continuing to expand.
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