Glyphosate is a broad-spectrum herbicide, weeding effect, widely used in the prevention and treatment of a variety of crop field weeds. However, improper use can cause damage to crops and even kill crops. Since 2004, it has been tested on the flue-cured tobacco field for 3 years, saving time and effort and good effect. It is a cost-effective method of prevention and control.
First, the performance and weeding mechanism (1) Performance: pure glyphosate is white crystal, soluble in water, slightly soluble in organic solvents such as ethanol and ether. Low toxicity to humans and animals, the oral LD50 of rats is 4320 mg / kg. It is a herbicide herbicide that can be transported by stems and leaves, usually within 1 week, and the perennial weeds gradually turn yellow and wither within 2 weeks.
(2) Weeding mechanism: After the green tissue of the stems and stems of the weeds absorbs the glyphosate solution, it is transmitted to other parts such as roots through the symplast. The mechanism of action is to interfere with the normal synthesis of proteins in the plants and cause the weeds to die.
Second, the use of pharmaceuticals (1) spraying objects: glyphosate is mainly used in orchards, tea gardens, high-crop crops and farmland before planting, prevention and control of various annual weeds, and is an excellent pesticide for the elimination of perennial weeds. For weeding of flue-cured tobacco plots, it is best to use flake-cured flakes with equal spacing.
(2) Spraying period: Most weeds have been unearthed, strong growth, and a certain leaf area, which is the best application period when it is sufficient to fully absorb the liquid. It should be sprayed at noon on sunny days or when there is no dew.
(3) Application rate: eliminate annual weeds per acre with 10% glyphosate water 0.5-1 kg diluted with water 30-45 kg and spray evenly on weed stems and leaves, such as type 16 (ie capacity 16L) Sprayer, depending on the weed situation, spray 2-3 pots per acre; remove perennial weeds with 10% glyphosate water 1-2 kg per acre and spray 30-40 kg water.
(4) Protection measures: Before spraying, install a protective cover on the nozzle to prevent the liquid from splashing onto the stems and leaves of the flue-cured tobacco. When spraying, try to lower the nozzle. If you don't have a special protective cover, you can use a plastic bowl and drill a proper hole in the center of the bottom to fix it on the nozzle. If the seedlings are small, the membrane can be used to pull up two barriers to protect the ridge.
III. Precautions (1) Before applying the medicine, the protective cover must be installed on the nozzle, and the nozzle should be sprayed carefully and not sprayed on the tobacco plant. (2) If it rains within 6 hours after spraying, it should be reduced after the weather is fine. (3) Wash the sprayer after spraying. Otherwise, the metal parts of the sprayer will be corroded, and the next time the other pesticides and fertilizers are sprayed, the crops will be damaged. (4) Except for special instructions, it cannot be mixed with other pesticides, fertilizers, herbicides, and plant growth regulators .
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