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First, try to use medicine before the seedlings. Chemical weeding in vegetable fields, mostly using soil treatment, but it must be used before sowing or before sowing. The time of application should be good at weeding in the first stage of weeds. This can avoid or reduce the contamination and residue of the medicament on vegetables.
Second, the soil should be smooth and moist. When the herbicide treats the soil, the soil requires that the soil surface be flat, finely divided and moist, so that not only can the application uniformity be ensured, but also the favorable conditions for the weed germination can be created, so that the weeds can be germinated uniformly, thereby achieving a drug to kill most of the time. The purpose of weeds is to improve the effect of weeding.
Third, you should take the medicine at the right time. General chemical herbicides work well during the germination of weeds. However, when the weeds grow to 9-10 cm or after tillering, the effect is poor or even ineffective. Therefore, the treatment of weeds should be carried out in the stage of weed germination.
Fourth, you should spray evenly. Chemical herbicides with poor wettability are prone to precipitation. Therefore, it is necessary to shake frequently when spraying to ensure uniform spraying, otherwise the concentration of the lower layer of liquid is too high, which may cause phytotoxicity.
Fifth, it is necessary to reduce the amount of medicine in the facility cultivation area. The soil cultivated in protected areas and other facilities has high temperature and high humidity, and the effect is fast and high. Therefore, the dosage should be reduced by 20% to 30% compared with the vegetable field in the open field, so as not to cause phytotoxicity in vegetables.
Six should be used alternately. Be careful not to use a single herbicide for a long time to prevent weeds from developing resistance and improve herbicidal effects.
Seven must be covered in time. Some chemical herbicides, such as trifluralin, are volatile, and should be covered immediately after application to ensure control. Some herbicides are easy to decompose and fail to be exposed to sunlight. Therefore, cover the soil immediately after administration.
Eight should use the herbicide with short duration. Depending on the variety of vegetables and the length of the growing season, it is generally preferred to use a herbicide with a suitable shelf life to reduce the time of residual contamination and ensure safety.
In vegetable production, cultivating and weeding often account for more than 40% of the total vegetable field management. If chemical weeding is used, it can not only effectively control weeds, improve the quality and yield of vegetables, but also save a lot of weeding labor and reduce labor intensity, but the following "eight attentions" should be made.
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