There are mainly single and dicotyledonous weeds in the corn field, such as crabgrass, goosegrass, setaria, red-branch, levy, leeks, and bowlflowers. Among them, grassy weeds dominated by crabgrass and goosegrass account for more than 70% of the total weeds in corn fields in our city. In the corn field, weeds grow rapidly and have a large amount of growth. They compete with water, compete for fertilizer, and compete for space with corn. They are harmful to the growth of corn seedlings, causing thin seedlings and weak seedlings, affecting the yield by 10% to 30%. Therefore, we must carry out Chemical weeding. The currently available soil-enclosed herbicides have a good effect, and once the weeds are ex-emerged, they can effectively control weed damage during the whole growth period of the corn. The techniques for weed control of weeds in corn fields are described below:
Correct selection of herbicide varieties: There are many types of herbicides currently used for the closure of soil in corn fields. According to the species that the plant protection station has popularized in recent years, there are two varieties that have better results: One is Jiangsu Xinyi Pesticide Factory. The 40% Yufeng suspoemulsion produced has the characteristics of new type, safety, high efficiency, low toxicity, low residue, etc. Since its introduction in 1998, the weeding effect is better; the other is the 48% weed killer produced by Boai Huifeng Company. For many years, the weeding effect has been widely recognized by farmers.
Time of use: Before corn emergence after seeding, or early after corn emergence. At this stage, weeds are in the stage of emergence, they are susceptible to drug contact and die, and the effect of spraying after weeds emerge will be less than ideal. Dosage: commonly used dose, mu 40% Yufeng suspoemulsion 165 g or 48% weeding Wei suspoemulsion 150 ml. However, mechanically harvesting higher plots of wheat bran should be increased by an appropriate amount. Mu with 40% Yufeng suspoemulsion 200 g or 48% weeding Wei suspoemulsion 175-200 ml. It is strictly prohibited to ignite the wheat bran to prevent the burning of wheat ash and herbicides react to reduce the efficacy.
How to use: It must be used after watering or rainfall, and the humidity in the field is large. It is best to apply water immediately after sowing the corn, and spray it 2-3 days after irrigation. When shaking the drug, shake it evenly, then calculate the dose according to the area of ​​use, and measure it accurately. First add a small amount of water to dilute the agent into the mother liquor, and then press the amount of water per acre of 40-50 kilograms, evenly spray the soil surface evenly after mixing. In order not to destroy the film during spraying, it should be carried out backwards while spraying.
Matters needing attention: First, it is best to use a sprayer, the amount of water should be sufficient, the spray should be uniform, do not re-spray or missed spray, to avoid the windy weather spray; Second, when corn just outcrops and corn farming, sand soil should not be used to avoid Produce phytotoxicity; Third, after spraying, a layer of film is formed on the surface of the ground, and the cultivator is not to be destroyed by cultivating. Fourth, the spray should be performed before 10 o'clock in the morning or after 4 o'clock in the afternoon to avoid volatilization or destruction of the drug film; If there is heavy rain within 24 hours after spraying, spraying should be promptly done; sixthly, more plots of Cyperus rotundus (ie cyperus) should be selected in the later stage for the selective spray of dimethyltetrachloromethane; seventh is the use of alkali after spraying. Water cleaning spray equipment, to avoid injury to other crops.
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