Cotton field herbicide spraying precautions
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First, strictly according to the required dosage. Herbicides have instructions for use, and should be applied strictly according to the required dosage. Do not increase the dosage arbitrarily to prevent phytotoxicity; especially in the case of thin sand, the lower dose should be used. Some indicate that the data area is expressed in hectares or square meters, and should be accurately converted into the amount of acre; some instructions are the amount of active ingredient in the amount of mu, which should be converted according to the content of the active ingredient to prevent the dosage from being too small to achieve the purpose of weeding. Fertile soil is less sensitive to phytotoxicity.
Second, avoid heavy spray or leak spray. If there is residual liquid after spraying, do not make up the spray on the ground to prevent damage to the local area; if the mechanical spraying is not enough for a wide width, the remaining artificial spray will be used to prevent re-spraying or leaking.
Third, the amount of medicine used in acre refers to the real area. If only the film is sprayed and the film is not sprayed, the area between the membranes should be subtracted to calculate the amount of the mu to prevent excessive spray.
4. If the drug has been used in sufficient amount before the cotton is sowed, it is no longer possible to spray the herbicide under the film to prevent the phytotoxicity.
5. Make sure that the doses of the nozzles are consistent. Avoid uneven dose of each nozzle, or unevenness on both sides of a nozzle, causing partial or intervening damage.
6. When the spray is stopped during operation, the spray valve must be closed.
7. Herbicides that need to be mixed with soil generally have the characteristics of being volatile and easily photolyzed. After spraying the soil, there are still a small amount of medicine left on the surface, which will be reduced by sun exposure; therefore, the herbicide is sprayed. Time, near weeding period, good weeding effect.
Eight, the technology of spraying herbicides on the film after sowing is not yet mature. Due to the non-standard specifications of the mulch or herbicide, it is not suitable for blind use in production without testing; it can only be applied to this technology and its products. If used improperly, or if weeding is not ideal, or is tainted, it can cause damage. In the same way, the "drug film" should not be used blindly without trial and control.
Nine, perennial root weeds are a major problem in weeding in cotton fields, often in addition to invincible, not only labor, cotton is also affected by grass. If the ground temperature rises before sowing, the grass has emerged from the leaves, and the herbicide can be sprayed before the cotton is broadcast to eliminate the after-effects, and then the cotton is broadcast. Although spraying twice to increase the cost, it can greatly reduce the cotton field weeding work in the growing season and is beneficial to cotton growth. It is advisable to use glyphosate. Because glyphosate is a systemic broad-spectrum herbicide that is sprayed on the blades of grass, it can be transported to underground rhizomes and cause weeds to die. Therefore, glyphosate can not only cure annual weeds, but also treat them. Perennial weeds such as thatch, reed, striated grass, and grass stalk, and paraquat is ineffective for perennial weeds (only killing the upper part of the ground). In places with such weeds, it is better to broadcast a few days later, etc. After the grass grows out of the leaves, it kills first, so that the cotton field is weeded and active throughout the year.
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