In fact, the reason for this phenomenon is that, apart from the quality of the herbicide product itself, it is mainly affected by many other external factors. Specifically there are the following factors:
1. Spray herbicide too late. At present, the herbicides applied by everyone are generally controlled at the stage of 2-5 leaves of corn and 2-3 leaves of weeds. If the application time is too late, the grass age is too large and the efficacy of the herbicide is seriously affected.
2. Improper application of the method. If the herbicide is sprayed with corn, it will continue to be used like other sprays. Footprints will destroy the film that has not yet formed on the surface of the soil, resulting in severely reduced efficacy of the herbicide.
3. The humidity in the field is not enough. When corn is sprayed with herbicides, the humidity in the field is not enough, and the liquid water immediately evaporates when contacted with the surface water, which prevents the liquid medicine from forming a film on the surface of the corn, resulting in the failure of the chemical to work properly and the effect is not good.
4. The water consumption is too small and the film is not evenly covered. It is generally required to dilute herbicides with a water consumption of 30 to 40 kg per mu. Individual users only use one bucket of water per mu.
5. The difference in application time. Some growers in order not to delay working outside the home, take a break at noon lunch time, the liquid quickly evaporated, affecting the weeding effect.
6. The wheat straw is too high, the wheat straw is not cleaned, and the liquid spray cannot reach the soil layer.
7. Soil causes. Sandy soil, saline-alkali land and over-fired land (alkaline grass is alkaline) have a certain influence on the weeding effect.
For the above reasons, it is recommended that: when the herbicide is applied, the suitable humidity in the field should be maintained to remove excessive wheat straw from the wheat field; the dosage should be appropriately reduced or increased according to the soil quality, and the selection should be made in the 2 to 5 leaf stage of maize and 2 to 3 leaf stage of weed. In the morning or evening, when the humidity on the surface of the soil is relatively high, spraying, forming a film, improving the weeding effect, and adopting an inverted type in the spraying process, so as to ensure that the efficacy of the herbicide can be exerted normally.
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