The primary concern in the use of herbicides is the safety of the herbicide to the crop, which is the biggest difference from pesticides and fungicides. Because herbicides are prone to phytotoxicity, in severe cases, the consequences of reduced yield and dead seedlings are caused. The herbicides are mainly used in soil treatment and stem and leaf treatment. 1. [Soil Treatment] Soil treatment mainly refers to soil treatment before seedling and soil treatment after seedling. 2. Post-emergence soil treatment The post-emergence soil treatment is carried out after the crop is planted. For example, herbicides such as He Da Zhuang and Cao Xing Xing, which are commonly used in paddy fields, are sown after the sowing of rice fields or after transplanting, to prevent weeds that have just sprouted. For larger weeds, stem and leaf treatment should be used. Second, [stem and leaf treatment] Stem and leaf treatment mainly includes pre-sowing stem and leaf treatment, post-emergence stem and leaf treatment and post-emergence directional spray. 2, post-emergence stem and leaf treatment after stem and leaf treatment is the use of selective herbicides, such as bensulfuron-methyl, commonly used in paddy fields, 秧田 once net, Tiancaojing, etc., to control weeds growing around rice seedlings and between rows. When selecting the post-emergence stem and leaf treatment, pay special attention to three points. First, the residual period of herbicides is long, and some herbicides have a long residual period. For example, rapeseed broadleaf herbicides (such as sulfazone) have a residual effect in soil for several months and a year. Some even years, the damage to the crops is serious. Second, we must pay attention to the appropriate period of weeding, such as rice in the field after transplanting green, soybean in the post-emergence weed 2-3 leaf stage, corn in the 3-4 leaf stage. Third, choose a symptomatic herbicide according to the type of weeds in the field. 3. After the seedlings, the directional spray after the sprayed seedlings means that the herbicides such as glyphosate can be used for weeding after crop seedlings by using protective devices such as protective covers, such as weeding of glyphosate in cotton fields. Weeding of rice fields and so on. Pay special attention to lowering the nozzle when applying the pesticide , avoid spraying the pesticide liquid onto the crop; do not use the mobile sprayer to spray the medicine; avoid using the medicine when the temperature is high; do not repeat the medicine. Round LED Explosion-proof Light Hanghong Lighting Co., Ltd , https://www.sdhhzm.com
1. Pre-emergence soil treatment The pre-emergence soil treatment can be carried out three or three days before or after crop sowing. The soil is treated with herbicides such as Wones, Acetochlor and Jinduer to seal off unearthed weeds. .
The soil treatment before seedling is convenient to apply and the cost is low. There is no grass damage in one season of application, but it is unstable due to the influence of climate and dry soil texture. The spray should be even when applied, the water should be sufficient, and the dosage should be accurate.
1. Before the sowing, the stem and leaf treatment is carried out before the sowing. The herbicide is sprayed with a fire (paraquat) and glyphosate. All the weeds that have been unearthed are killed before sowing. Planting, so we can kill weeds safely and effectively. There is a difference between a fire and glyphosate. Because a fire is a contact-type herbicide, and it is passivated by soil, it will not affect the growth of crops. It can be applied on the same day or two days before planting. Glyphosate is a systemic herbicide, and it takes a long time (about one week in advance) to plant the crop to ensure that it does not affect the growth of the subsequently planted crop. This method of stem and leaf treatment before sowing is difficult to control the weeds. In order to solve this problem, it is recommended to mix a fire (paraquat) or glyphosate with the soil sealer, Wones, etc. One kills."