Analysis of the effect of glyphosate herbicide

1. Why is there a difference in efficacy when applying glyphosate herbicide? Glyphosate is an organic phosphine systemic herbicide that has no residues in the soil and is widely used in no-tillage chemical weeding and forestry and orchard. Directional weeding can kill all kinds of weeds growing on the ground, but it is not effective for weeds that have not been unearthed in the underground. Glyphosate herbicides are effective against 40 species of weeds, including monocotyledonous, dicotyledonous, annual and perennial herbaceous weeds and shrubs, algae, and ferns. The inconsistent herbicidal effects of glyphosate herbicides reflected by farmers' friends have been investigated and observed by the following reasons: First, the use of weeds in different growth stages will have different effects. Glyphosate is a systemic herbicide, so it should be used during the most vigorous growth of weeds. In general, annual weeds have a height of about 15 cm, perennial weeds have a height of 30 cm, and 6-8 leaves are most suitable. Regardless of the weeding period of weeds, after weeds are aging, blind spraying and weeding, of course, will not receive the desired control effect. Second, there are differences in the efficacy of spraying different concentrations. According to the survey, the concentration of the drug used by farmers in the use of glyphosate is not as strict as other pesticides, and the randomness is large. The phenomenon of increasing the dosage or reducing the dosage sometimes occurs. The type of weed must be considered when determining the concentration of the drug. Generally, grass weeds are sensitive to glyphosate and can be killed by low-dose liquids, while the concentration is increased when controlling broad-leaved weeds; higher concentrations are required for some perennial rhizomes-producing malignant weeds. The weeds are older and the resistance is improved, and the corresponding dose is also increased.
Second, how to fully exert the herbicidal effect of glyphosate First, the glyphosate solution should be transferred to the rhizome tissue under the grassland in large quantities to achieve the herbicidal effect. This requires weeds to have more leaves. If the weed area is small and the photosynthesis is not strong before use, the nutrients stored in the roots are transmitted from bottom to top. At this time, the amount of the liquid is input downward into the roots. To kill grass effect. In the middle and late stages of weed growth, photosynthesis is strong, and photosynthetic products are transmitted from top to bottom. Therefore, the most important thing to use glyphosate is to choose the best period of use. For example, it is best to use glyphosate to control weeds in corn fields. There are 2-3 old leaves in the lower part of the 1.5 m high corn seedlings. The best application is when the grass height reaches 10 cm. The second is to pay attention to environmental conditions. In the range of 24-25 Â°C, the absorption of glyphosate by the weeds doubles with the increase of temperature, so the effect of the drug is better when the atmospheric temperature is higher than the temperature. The high relative humidity of the air can prolong the wetting time of the liquid on the surface of the plant and facilitate the conduction of the drug. The soil moisture and water content are not conducive to the metabolism of plants, which is not conducive to the conduction of drugs in weeds, so the efficacy is also reduced. Again, regarding the problem of mixing glyphosate with other herbicides, some farmers want to remove a variety of grasses. In order to save labor, other herbicides are added when using glyphosate, but the results are not good because some herbicides Can not be mixed with glyphosate, such as metformin, paraquat and other quick-acting herbicides can not be mixed with glyphosate, in order to avoid partial premature death on the grass, lost glyphosate The systemic absorption function reduces the killing effect of glyphosate on the root weed rhizomes. However, adding some plant growth regulators and adjuvants (silicone) to glyphosate can improve the control effect. The fourth is to choose the best method of application. The method of drug control is very important for glyphosate to control weeds, because the higher the concentration in a certain concentration range, the finer the droplets of the sprayer are, which is beneficial to the absorption of weeds. The more the amount is used, the better the herbicidal effect.
Third, pay attention to the safety of crops when glyphosate is used. Glyphosate is a herbicide that is extinct. If used improperly, it will bring safety hazards to crops. Some farmers use glyphosate to weed the field, often because of the dispersion of glyphosate, causing phytotoxicity to the crops next to it. In addition, after the farmers use, the sprayer is not cleaned as required. As a result, when the other pesticides are sprayed, the residual glyphosate agent is sprayed on other crops to cause phytotoxicity. If phytotoxicity occurs on rice, the leaves of the lighter are chlorotic, causing severe growth disorders, severe or early death, or no heading, abnormal spikes.

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