There are two types of corn herbicide use time: one is the pre-emergence herbicide and the other is the post-emergence herbicide. The herbicide spraying effect is affected by many factors such as soil temperature and humidity, soil texture, climatic conditions, and human operations. Generally, the following points should be noted:
1. Wash the sprayer before spraying to avoid residual phytotoxicity.
2, the use of secondary dilution method, with warm water into the mother liquor after the water spray. That is, before the use of the drug, the herbicide should be mixed with the 30-30 degree warm water and then transferred into the mother liquor. Then pour it into the sprayer and dilute with water (normal temperature water) to increase the efficacy of the herbicide. Try not to use cold water directly. Pharmacy, otherwise the efficacy will decrease.
3, medication period: closed herbicide should be after corn sowing, most of the weeds have not yet been excavated, it is best to spray the drug within 7 days after sowing, corn cones soil dew point, or before and after dew cone can no longer be used Pre-emergence closed medicine. When spraying, the temperature is low, and the efficacy is not good. It is best that the daily average temperature is above 15 degrees. Don't do it before heavy rain, so as to prevent the medicine from infiltrating the seed buds from the rain and producing phytotoxicity and affecting the normal emergence. Choice of windless or breezy weather application to avoid drift hazards. Spraying can be done before 10 o'clock in the morning or after 4 o'clock in the afternoon. When spraying, it is necessary to slow down at a constant speed. Do not spray or spray. Breathing. Sprayer should be turned down. Sprayer should be equipped with a protective hood before. Liquid spray.
4, to grasp the appropriate dose: Some farmers in the use of drugs for the pursuit of weeding effect, not according to the provisions of herbicides, unauthorized use of increased doses, mistakenly thought that increasing the amount can increase the weeding effect, resulting in excessive medication, the concentration is too high Causes phytotoxicity. Farmers should follow the instructions of the product or the technicians to guide the use of pesticides. Generally, the amount of sand land should be reduced accordingly. Black soil and fertile land should be increased accordingly. If the temperature is low and the soil moisture is high, it should be reduced according to the circumstances of the land. If overdose, it will cause drugs. harm.
5. If maize seedlings have been unearthed, miss the opportunity to use closed drugs, do not use herbicides before seedlings, use corn seedlings in 3-3-5 leaf stage, weeds and 2-leaf herbicides in post-emergence, if not Considering the effects on post-crop crops, nicosulfuron and atrazine can be used. In order to increase the herbicide effect, the amount of water to be competed should be increased as much as possible when the amount of pesticide is not changed, and can be no less than 50 kg per 667 square meters. In the case of poor soil moisture, water must be sprayed before spraying. The drug can form a layer of film on the surface of the soil, so that it can make full use of the efficacy.
6, for the closure of some vicious weeds. If post-harvest herbicides are recommended when vicious weeds such as ramie, locust, and root grass are difficult to seal.
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