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Selection methods and techniques of post-emergence herbicides for corn
First of all, the performance of various herbicides differs greatly from the range of herbicides. If you are slightly careless, it may cause damage to corn. Therefore, when using the medicine, it is necessary to carefully grasp the exact period and dosage of the medicine according to the performance characteristics and effective ingredients of various medicines. It is difficult to use the premature and too small amount to kill the grass. If it is too large, it may cause damage to the corn. At the same time, according to the soil texture, moisture content, corn seedling size, weed size, etc., the dosage should be increased or decreased according to the soil to avoid injury.
Where a single herbicide is used, care should be taken to calculate the amount of the drug in accordance with the safe and effective dose of the herbicide and the actual area of the corn field. At the same time, if two or more herbicides are mixed, the herbicidal spectrum must be different, but the applicable crops, period and method of use should be consistent and basically the same; when the wettable powder is mixed with the emulsifiable concentrate, the wettable powder should be dissolved in a small amount. The mother liquor is made in water, and then the emulsifiable concentrate is added; when the liquid is prepared, the semi-spray water is first added, and the second diluted pesticide mother liquor is added, and finally the sufficient water is added, and the mixture is fully shaken and sprayed.
Secondly, the application equipment should be carefully and strictly cleaned before use. The cleaning before use can prevent the influence of the previous residual medicine on the medication. After use, the cleaning can eliminate the hidden danger of the next medication. Especially in the case of the previous use of drugs to control other types of pests or weeds in crop fields, it should be strictly cleaned, otherwise it may cause phytotoxicity to corn. If necessary, after soaking and rinsing various parts of the sprayer with 2%~3% soda water. Use it again.
In addition, when using herbicides, it is necessary to select the appropriate herbicide according to the type, size and severity of weeds during the growth period of corn. According to the dosage, time and method of use determined in the instruction manual, it is forbidden to increase the dosage. Can not be re-sprayed or leaked. Before the three-leaf stage, 72% of 2.4-D butyl emulsifiable concentrate and 48% hydrazine enemies can be used for seedling spray. Before the 4-9 leaf stage, 20% metformin, 40% atrazine suspension, 72% 2.4-D butyl emulsifiable concentrate and 80% buds WP can be used. In addition, stem and leaf herbicides should be avoided in high temperature and high humidity.
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