First, pay attention to try to use medicine before the seedlings. Vegetable chemical weeding, mostly using soil treatment, but must be used before sowing or before sowing after sowing, the time of application should be weeding in the first stage of weeds. This can avoid or reduce the contamination of vegetables with vegetables. Before the soil is treated with the herbicide, the soil surface is required to be flat, the soil particles are finely divided and moist, so that the application of the weeds can be ensured evenly, and the weeds can be germinated once, so that the medicine can be killed once. The purpose of some weeds is to improve the effect of weeding. General chemical herbicides work well during the germination of weeds. However, when the weeds grow to 9 cm or after tillering, the effect is poor or even ineffective. Therefore, the herbicide is carried out during the weeding stage of weeds. A chemical 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 is too high, which may cause phytotoxicity. The soil cultivated in protected facilities and other facilities has high soil temperature, high humidity, and high and high efficacy. Therefore, the dosage should be reduced by 20-30% compared with the vegetable field in the open field, so as not to cause phytotoxicity in vegetables. In order to improve the herbicidal effect, it is not possible to use a single herbicide for a long time to prevent weeds from becoming resistant. Some chemical herbicides such as trifluralin are volatile, and should be covered immediately after application to ensure the herbicidal effect. Some herbicides are easy to decompose and fail, and they cannot be exposed to sunlight. Therefore, they should be covered immediately after application. According to the different varieties of vegetables and the length of the growing season, it is generally used to select herbicides with appropriate duration, which can reduce the time of herbicide residue pollution and ensure the safety of vegetable production. Square Steel Tube,Seamless Steel Pipe,Galvanized Steel Pipe Tianyi Steel Pipe Co., Ltd. , http://www.czseamlesspipe.com
Second, pay attention to make the soil smooth and humid
Third, pay attention to timely medication
Fourth, pay attention to uniform spraying
Fifth, we must pay attention to reducing the amount of medication in the facility cultivation area.
Six should pay attention to alternating medication
Seven should pay attention to timely covering
Eight should pay attention to the selection of herbicides with short duration