Precautions for the use of herbicides in drylands
Pay attention to the time of application of weeds when the bud is sensitive to the drug, at this time the best effect of medication. Dryland herbicides are generally used twice. The first sowing time is before sowing seedlings, and the cultivation time is the best when the weed seed begins to sprout or the tender grass has just emerged. The second application time is best. It should be based on the length of the pesticide and the weeds in the field, usually in the middle of July.
Note that the amount of medication used directly affects the weeding effect. In general, reference should be made to the instructions for the use of pharmaceuticals. However, the amount of the drug should vary according to environmental conditions. The same agent used in the same area also varies with changes in external conditions. When the weeds are tall and the cultivated plants are strong, the amount of medicine used can be larger; when the temperature is low, the amount of medicine used should also be larger; the application of sandy loam soil should be reduced appropriately to avoid phytotoxicity.
Pay attention to the application method The treatment method of weeds in dryland herbicides includes stem and leaf treatment and soil treatment. Stem and leaf treatment that is sprayed on the stems and leaves, contact or through the leaves infiltrated into the plant body conduction killing weeds, commonly used spray method. Soil treatment allows the agent to come into contact with the soil and then kill the weeds. Spraying, pouring and poisoning can be used.
Pay attention to the application environment and safety options for spraying on sunny days. There should be no heavy rain at 12 hours after application. Low temperatures, excessive soil moisture or too little effect. It is best done when there is no wind. When the wind is small, the direction of the spray should be smooth or beveled with the wind direction. When the wind blows, it must be moved backwards. It is forbidden to spray the medicine on the nearby crops to prevent the occurrence of phytotoxicity.
Pay attention to the rational use of the various herbicides currently sold on the market are mostly monotonous, each herbicide herbicide range is limited, so more than two kinds of herbicide mixed application is necessary. When mixing, the following principles must be mastered: the combination of herbicides that kill different objects; the combination of quick-acting and slow-acting herbicides; the combination of internal-conveying and contact-killing types: the combination of long-term and short-lived residues; and high diffusion in soil The combination of small and diffuse.
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