Pre-emergence treatment Vegetable field chemical weeding, mostly using soil treatment. Practice has proved that the effect of pre-emergence before or after sowing is the best, which can effectively avoid or reduce the contamination of vegetables by chemical residues, so as to facilitate the production of pollution-free vegetables.
Timely medications Weed control is best carried out during the weeding phase of weeds. The general herbicide is effective in the germination period of the weeds, and the effect is poor or even ineffective after the weeds grow to 9 cm or tiller.
Uniform spray The herbicide with poor wettability is 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.
Alternate medication Note that a single herbicide should not be used for a long time to prevent weeds from developing resistance and reducing herbicidal effects.
Facility cultivation and reduction of medicines The soil cultivated in facilities such as protected areas has high soil temperature, high humidity and high efficacy. Therefore, the dosage should be reduced by 20% to 30% compared with the vegetable field in the open field, so as to avoid phytotoxicity of vegetables.
Soil wetting In the process of applying herbicides, the ground is required to be leveled, the soil particles are finely divided and moistened, which not only ensures uniform application, but also creates favorable conditions for weed germination, so that weeds are germinated uniformly, so as to kill once. The purpose of most weeds is to improve the weeding effect.
Timely covering soil For herbicides that are volatile and cannot be exposed to sunlight, it is necessary to cover the soil immediately after application to ensure the efficacy.
According to the different vegetable varieties and the length of the growing season, it is better to use a herbicide with a suitable duration and short duration to reduce the time of herbicide residue pollution and ensure food safety.
Implementation of pollution-free standards Chemical weeding in vegetable fields must be carried out in strict accordance with pollution-free standards to achieve high yield and quality.
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