Chemical weeding, mostly soil treatment, but must be used before sowing or before sowing. The time of application should be good in 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 humid.
The soil requires that the soil surface be flat, finely divided and moist. This not only ensures uniform application of the soil, but also creates favorable conditions for weed germination, so that the weeds are germinated uniformly, so as to achieve the purpose of killing most weeds once and improve weeding. Effect.
Third, timely medication
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, weed control should be carried out during the weeding stage of weeds.
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, we must reduce the amount of medication 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 cover the soil 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 and 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.
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