Strict selection of herbicide varieties There are many types of herbicides, and each herbicide has a certain herbicidal spectrum. Some herbicides have a very narrow spectrum of herbicides, such as oatmeal, which can only control wild oats; the effect of dimethyltetrachloride on the control of sage, horseshoe, and wild oatmeal is very good, and the effect of controlling pig mites is very poor; 2,4-D is effective for controlling dicotyledonous weeds such as amaranth, but not for grass weeds. Farmers should choose the herbicide for the road according to the most weed species in the wheat field in order to receive the desired effect. For the control of broad-leaved weeds, weeding nets, earth grass nets, bensulfuron-methyl, baijia mixture and other varieties have good herbicidal effects; while metsulfuron-methyl, chlorsulfuron-methyl, wheatgrass, etc. can only be used in rice-wheat rotation. Early use in wheat fields, if rice cultivars plant cotton, corn, peanuts, beans and other crops, serious phytotoxicity will occur, resulting in almost unacceptable accidents.
Strict and optimal application time Many farmers choose the time to use herbicides in the wheat field in the spring, and wait until the grass age and density of the weeds are applied. At this time, the weeds are large in age, and the drug resistance is enhanced. When the control is carried out, the amount of the drug must be increased, which increases the cost and easily causes phytotoxicity to the wheat and the pupa and the adjacent crops. For example, when using 48% chlorpyrifos or 2,4-D during the pregnancy of wheat, the application time is too late, which will cause the wheat to not form seeds. Years of trials and production practices have shown that the use of herbicides in wheat fields should be good before winter. The time is generally selected before the emergence of wheat, pre-emergence herbicides, or wheat 2 to 4 leaf stage selection of herbicides that can kill the weeds.
Strictly control the temperature and humidity of the application 1. Master the temperature at the time of application. The temperature of the application directly affects the effect of the herbicide. For example, 2,4-D, dimethyltetrachloride and the like have a poor application effect at temperatures below 10 °C. The application effect is better at 10 °C or above; the superstar herbicide is at Under low temperature conditions, the herbicidal effect was exhibited 30 to 40 days after application. Therefore, the use of herbicides in wheat fields should be applied when the temperature is high on sunny days to fully exert the effects. 2. Ensure that the soil moisture is sufficient when applying the medicine. Whether it is the application of soil before the emergence of wheat or the application of wheat during the growing season, soil moisture is an important factor affecting the efficacy. When the seedlings are applied before the seedlings, if the soil moisture of the topsoil is large, it is easy to form a strict sealing layer of the soil, and the weed seeds are germinated and quickly released, so the control effect is high. When the wheat is applied in the growing season, if the soil is moist, it is beneficial to the weeds to absorb the herbicides and operate in the body, so the effect of the drug is fast and the herbicidal effect is good.
Strict control of the amount of weeds and wheat are plants, and the selectivity of herbicides is limited. To ensure that herbicides kill both weeds and wheat, the amount of herbicides must be strictly controlled, neither increasing nor reducing. It must be used according to the dosage described in the instruction manual, and it should be adapted to local conditions. Soils with high organic matter content and fine soil particles have a large amount of adsorption to herbicides, and the amount of soil microorganisms is high, the activity is vigorous, and the agents are degraded more, and the application amount should be appropriately increased. The sandy loam soil has larger particles and less adsorption to the medicament. The drug molecules are mostly free in the soil particles, and the activity is strong, which is prone to phytotoxicity, and the dosage can be appropriately reduced. Herbicides are more stable in alkaline soils, are not easy to decompose, have long residual effects, and are easy to cause phytotoxicity to the crops. Therefore, the application time on alkaline soil should be as early as possible and used with caution.
Strict control of spraying technology When using herbicides, be sure to dilute enough water to mix well. To achieve uniform spraying, no heavy spray, no leakage. If adjacent plots are sensitive crops of herbicides, isolation measures should be taken to prevent the crops of adjacent plots from being damaged if there is wind. It is best to use herbicide-spraying equipment to prevent crop damage when spraying other pesticides. If the medicine does not have special conditions, after spraying the herbicide, it must be washed repeatedly with bleaching powder before it can be used to control crop pests and diseases.
Strict and optimal application time Many farmers choose the time to use herbicides in the wheat field in the spring, and wait until the grass age and density of the weeds are applied. At this time, the weeds are large in age, and the drug resistance is enhanced. When the control is carried out, the amount of the drug must be increased, which increases the cost and easily causes phytotoxicity to the wheat and the pupa and the adjacent crops. For example, when using 48% chlorpyrifos or 2,4-D during the pregnancy of wheat, the application time is too late, which will cause the wheat to not form seeds. Years of trials and production practices have shown that the use of herbicides in wheat fields should be good before winter. The time is generally selected before the emergence of wheat, pre-emergence herbicides, or wheat 2 to 4 leaf stage selection of herbicides that can kill the weeds.
Strictly control the temperature and humidity of the application 1. Master the temperature at the time of application. The temperature of the application directly affects the effect of the herbicide. For example, 2,4-D, dimethyltetrachloride and the like have a poor application effect at temperatures below 10 °C. The application effect is better at 10 °C or above; the superstar herbicide is at Under low temperature conditions, the herbicidal effect was exhibited 30 to 40 days after application. Therefore, the use of herbicides in wheat fields should be applied when the temperature is high on sunny days to fully exert the effects. 2. Ensure that the soil moisture is sufficient when applying the medicine. Whether it is the application of soil before the emergence of wheat or the application of wheat during the growing season, soil moisture is an important factor affecting the efficacy. When the seedlings are applied before the seedlings, if the soil moisture of the topsoil is large, it is easy to form a strict sealing layer of the soil, and the weed seeds are germinated and quickly released, so the control effect is high. When the wheat is applied in the growing season, if the soil is moist, it is beneficial to the weeds to absorb the herbicides and operate in the body, so the effect of the drug is fast and the herbicidal effect is good.
Strict control of the amount of weeds and wheat are plants, and the selectivity of herbicides is limited. To ensure that herbicides kill both weeds and wheat, the amount of herbicides must be strictly controlled, neither increasing nor reducing. It must be used according to the dosage described in the instruction manual, and it should be adapted to local conditions. Soils with high organic matter content and fine soil particles have a large amount of adsorption to herbicides, and the amount of soil microorganisms is high, the activity is vigorous, and the agents are degraded more, and the application amount should be appropriately increased. The sandy loam soil has larger particles and less adsorption to the medicament. The drug molecules are mostly free in the soil particles, and the activity is strong, which is prone to phytotoxicity, and the dosage can be appropriately reduced. Herbicides are more stable in alkaline soils, are not easy to decompose, have long residual effects, and are easy to cause phytotoxicity to the crops. Therefore, the application time on alkaline soil should be as early as possible and used with caution.
Strict control of spraying technology When using herbicides, be sure to dilute enough water to mix well. To achieve uniform spraying, no heavy spray, no leakage. If adjacent plots are sensitive crops of herbicides, isolation measures should be taken to prevent the crops of adjacent plots from being damaged if there is wind. It is best to use herbicide-spraying equipment to prevent crop damage when spraying other pesticides. If the medicine does not have special conditions, after spraying the herbicide, it must be washed repeatedly with bleaching powder before it can be used to control crop pests and diseases.
ã€Comment】 ã€Print this article】 ã€Close this page】 ã€Large, medium and small】
250mm (10 Inch) Flat Cut-off Disc
B&H TOOLS CO., LTD. , https://www.bandhtools.com