What precautions should be taken when using herbicides in vegetable fields?
Issues to note when using herbicides in vegetable fields
In vegetable production, hoeing and weeding often account for more than 40% of the total labor used in vegetable field management. If chemical weeding is adopted, it can not only effectively control weeds and improve the quality and yield of vegetables, but also save a large amount of weeding labor and reduce labor intensity. However, the following "eight points to note" should be observed.
First, use the herbicide before seedling emergence as much as possible. Chemical weeding in vegetable fields mostly uses soil treatment, but it must be applied before sowing or after sowing and before sprouting. The best weeding effect is achieved when the herbicide is applied at the initial stage of weed growth. This can avoid or reduce contamination and residues of the pesticide in vegetables.
Second, make the soil level, fine and moist. When treating the soil with herbicide, the soil surface should be level, finely crushed and moist. This can not only ensure uniform application, but also create favorable conditions for weed germination, so that weeds germinate uniformly, thereby achieving the goal of killing most weeds with one application and improving the weed control effect.
Third, apply the herbicide at the right time. General chemical herbicides work well when used at the weed germination stage. If applied when weeds have grown to 9-10 cm or after tillering, the effect is poor or even ineffective. Therefore, weed control should be carried out at the weed germination stage.
Fourth, spray evenly. Chemical herbicides with poor wettability are prone to precipitation. Therefore, when spraying, shake frequently to ensure uniform application; otherwise, the lower layer of the spray liquid will be too concentrated and easily cause pesticide damage.
Fifth, reduce the dosage in protected cultivation areas. In protected facilities such as protected cultivation, the soil temperature is high and the humidity is high, so the pesticide effect is fast and strong. Therefore, the dosage should be reduced by 20%-30% compared with open-field vegetable fields to avoid pesticide damage to vegetables.
Sixth, alternate the herbicides used. Note that a single herbicide should not be used alone for a long time, so as to prevent weeds from developing resistance and to improve the weed control effect.
Seventh, cover with soil in time. Some chemical herbicides, such as trifluralin, volatilize easily, and soil must be covered immediately after application to ensure the control effect. Some herbicides decompose and become ineffective when exposed to light and cannot be exposed to sunlight. Therefore, cover with soil immediately after application.
Eighth, choose herbicides with a short residual period. According to different vegetable varieties and the length of the growing period, it is generally better to choose herbicides with an appropriate residual period, so as to reduce the time of residual contamination and ensure safety.
First, use the herbicide before seedling emergence as much as possible. Chemical weeding in vegetable fields mostly uses soil treatment, but it must be applied before sowing or after sowing and before sprouting. The best weeding effect is achieved when the herbicide is applied at the initial stage of weed growth. This can avoid or reduce contamination and residues of the pesticide in vegetables.
Second, make the soil level, fine and moist. When treating the soil with herbicide, the soil surface should be level, finely crushed and moist. This can not only ensure uniform application, but also create favorable conditions for weed germination, so that weeds germinate uniformly, thereby achieving the goal of killing most weeds with one application and improving the weed control effect.
Third, apply the herbicide at the right time. General chemical herbicides work well when used at the weed germination stage. If applied when weeds have grown to 9-10 cm or after tillering, the effect is poor or even ineffective. Therefore, weed control should be carried out at the weed germination stage.
Fourth, spray evenly. Chemical herbicides with poor wettability are prone to precipitation. Therefore, when spraying, shake frequently to ensure uniform application; otherwise, the lower layer of the spray liquid will be too concentrated and easily cause pesticide damage.
Fifth, reduce the dosage in protected cultivation areas. In protected facilities such as protected cultivation, the soil temperature is high and the humidity is high, so the pesticide effect is fast and strong. Therefore, the dosage should be reduced by 20%-30% compared with open-field vegetable fields to avoid pesticide damage to vegetables.
Sixth, alternate the herbicides used. Note that a single herbicide should not be used alone for a long time, so as to prevent weeds from developing resistance and to improve the weed control effect.
Seventh, cover with soil in time. Some chemical herbicides, such as trifluralin, volatilize easily, and soil must be covered immediately after application to ensure the control effect. Some herbicides decompose and become ineffective when exposed to light and cannot be exposed to sunlight. Therefore, cover with soil immediately after application.
Eighth, choose herbicides with a short residual period. According to different vegetable varieties and the length of the growing period, it is generally better to choose herbicides with an appropriate residual period, so as to reduce the time of residual contamination and ensure safety.