First, pay attention to the impact of environmental conditions on the efficacy of the drug.
1. Atmospheric temperature. The temperature is below 20 °C and the application effect is poor. The temperature rises, the efficacy is improved, and the dosage can be appropriately reduced. However, for the volatile agent 2.4-D butyl ester, trifluralin, etc., should be discontinued at 28 ° C or above.
2. Soil moisture. When green merlon, chlorpyrifos, and wheat straw are used as soil treatment, they must be carried out while the soil is wet, in order to be effective.
3. Sunlight stimulation. Herbicides are photoactive agents and should be sprayed with sunlight.
4. Soil pH. Some herbicides are easily decomposed in strongly acidic or alkaline soils and should be used in appropriate amounts.
Second, pay attention to prevent acute phytotoxicity of crops.
Most herbicides can cause different degrees of phytotoxicity to the branches and leaves of plants. Therefore, when using herbicides, the concentration of the liquid should not be arbitrarily increased to reduce the phytotoxicity.
Third, pay attention to reduce the residual amount of herbicides.
Because various plants have different degrees of systemic absorption of herbicides, the agents are easily absorbed by plant roots, and some perennial grasses are no exception.
Fourth, pay attention to herbicides to harm the intercropping crops.
Since some herbicides are not easily degraded by the soil, they remain in the soil for a certain period of time after application. Therefore, in the fields where these herbicides are used, if the soybeans or cotton are intercropped, they will definitely suffer.
Fifth, pay attention to the harm of humans and animals and the environment.
When using a drug that is more irritating to humans, it is necessary to do a good job of protection. Do not let the liquid flow into the pond or the living water of humans and animals. If the skin is stained with chemicals, rinse it with soapy water and water.
Hua County Plant Protection and Quarantine Station Wu Limin
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