Note that when the weed seeds are germinated and just sprouted during the application period, they are sensitive to the agent, and the drug effect is best at this time. The herbicide used in dry land can generally be used twice. The first time in the planting site is the seedling before the sowing. The first time the cultivated land is germinated or the fresh grass is just unearthed, the application time is the most suitable. It depends on the length of the drug and the weeds in the field, usually in the middle of July.
Note that the amount of drug used directly affects the herbicidal effect. Generally, the instructions for use of the drug should be referred to, but the dose should be different depending on the environmental conditions. The same drug applied in the same area will also vary with the external conditions, and it should be controlled flexibly according to the local conditions. When the weeds are tall and the cultivated plants are strong, the dosage can be larger; when the temperature is low, the dosage should be larger; the application of the sand loam should be appropriately reduced to avoid phytotoxicity.
Note the application method The weed treatment of weeds in dry land has two methods: stem and leaf treatment and soil treatment. Stem and leaf treatment means spraying the medicament on the stems and leaves, killing or transmitting the weeds through the infiltration of the foliage in the plant, and the spraying method is generally used. The soil treatment allows the medicinal agent to first contact the soil and then kill the weeds. The spray method, the pouring method, and the toxic soil method can be used.
Pay attention to the application environment and safe choice to apply the medicine on sunny days. There should be no heavy rain within 12 hours after application. The temperature is low, the soil moisture is too large or too small, and the effect is poor. It is best to do it when there is no wind. When the wind is small, the spray direction should be downwind or beveled with the wind direction. When the leeward sprays, it should be moved backwards. It is strictly forbidden to spray the medicine on nearby crops to prevent phytotoxicity.
Pay attention to the rational selection and alternate use of herbicide weeding, trifluralin, cable, acetochlor to kill grass weeds; Guoer, dry grass can only remove pre-emergence or early post-emergence weeds, unable to control the age of miscellaneous Grass; thatchgrass mainly prevents narrow-leaf weeds, and Simazin has good effects on annual shallow root weeds, so different types of herbicides should be used alternately.
Pay attention to reasonable mixing. Most of the herbicides currently on the market are single. The herbicide range of each herbicide is limited, so it is necessary to mix two or more herbicides. The following principles must be mastered when mixing: herbicide combination to eliminate different subjects; quick-acting and slow-acting herbicide combination; endocytic conduction and contact-type combination: long-lasting and short-term combination; large diffusivity in soil A combination of low diffusivity.
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