1. Use suitable herbicides: Each herbicide has its scope of use, and its herbicidal selectivity is very strong. In addition to corn herbicides, other herbicides can not be randomly used in the corn field, even when using corn herbicides. Be cautious, otherwise it will have adverse consequences.
2. Carefully study the instructions for use: There are many kinds of corn herbicides, and different methods and time of use are different. The first is the drug concentration. If the concentration is too low and the dosage is not enough, the effect of weeding will not be achieved. If the concentration is too high and the amount is too large, corn will be harmed by phytotoxicity. Followed by the time of medication, some herbicides are used before emergence after sowing, spraying after emergence is likely to cause phytotoxicity, some after emergence and use, pre-emergence application effect is not significant. In addition, some herbicides also have different sites of action on weeds. For example, acetochlor herbicides mainly act on buds and young roots, so this herbicide must be used before emergence of weeds. In general, commodity drugs have instructions for use, such as concentration, dosage, and application time range. In general, soils with high organic matter content and poor lye are subject to the upper limit of safe concentration, and vice versa. Limit value. In addition, the amount and concentration of some drugs are indicated by the active ingredient, and the active ingredient refers to the pure dose or pure drug percentage.
3. Pay attention to the impact on the crops after the crops: Some herbicides have a long residual effect, and residues after application have phytotoxicity on sensitive crops of the rear crops. For example, atrazine is an effective herbicide for corn, but it has a long shelf life and it has a certain influence on post-crop crops such as beans. The corn fields that used herbicides last year had a great influence on millet next year, and there were often dead seedlings.
4. Medication should be "three look": must pay attention to the weather and corn growth before use.
Look at the sky: Do not apply pesticides on rainy days, especially before heavy rains. Otherwise, the rainy days will have a dilution effect on the liquid. Heavy rain will scour the liquid, causing loss of high-lying areas, reducing efficacy, and gathering in low-lying areas. Phytotoxicity. When herbicides are sprayed when the wind is large, it is prone to fog drift and harm the sensitive crops around. After the application of heavy rain, the drug layer may be washed out.
Look at the place: When the soil moisture is poor, the effect is not good. When the water capacity in the field is large, the liquid will be diluted and the effect is poor. Usually, a small amount of water is poured before the application, so that the ground water is wet, or it is applied after light rain.
Look at the crops: In the seedling stage, when the weeds are small, the systemic herbicides can be selected. After the big bell-mouth period, when the weeds are larger, the killing herbicide should be used better.
5. The cultivator is forbidden for a period of time after application, and the destruction of the surface drug layer should be avoided as far as possible so as not to affect the effect.
6. Sandy soil, due to more liquid leakage, should increase the amount of drug.
7. Grasp the appropriate interval between applications, when the same corn field uses two drugs, there should be an appropriate interval, short intervals will also produce phytotoxicity. In addition, herbicides should not be blindly mixed with other pesticides, and there must be some choices. For example, the combination of acetochlor and atrazine, a colloidal suspension, can expand the scope of broad-leaved weed control.
8. Used medicines should be rinsed with lye and rinsed in a timely manner. Do not use sprayer to grow each other to prevent chain reaction. After the pesticide application, the herbicide bottles and bags must be properly destroyed. They must not be thrown into the ditch or pond to prevent other farmers from using the pond water to cause a large area of ​​crop damage.
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