The current summer corn planting has been fully carried out. The use of herbicides will follow closely. Several technical issues in production are described below.
First, after the wheat is harvested, if there is already a large amount of weeds in the ground, we must use "killed" herbicides. The prevention and control effects are obvious: "Kirkham trace," "paraquat," and "grass-grow spirit." The first two are "touch-killing" herbicides that can directly kill the above-ground parts of all exposed green plants but have no effect on the roots of the plants. Once the water and fertilizer conditions are right, weeds may grow back in the later stages. "Cigarin" is a systemic herbicide, and no effect can be seen in the early stage after spraying. But about half a month later, the weeds will completely die from the roots and will no longer grow. Therefore, it is better to be a "grass-and-garlic".
Secondly, the herbicides that were excavated from weeds were "Erhide Mixture", "Yucaojing" and "Du'ahe Mixture". Generally, 200 grams per mu was used, 45 kilograms of water was used, and (3 equivalents of sprayer water). Control effect is good. If the amount of water is small, the closed layer of the pharmaceutical agent is thin, and some resistant weeds are very easy to drill into the closed layer, resulting in poor control efficiency. However, the amount of water should not be too much, otherwise the effective concentration of the agent will decrease, and no blocking effect will be achieved. Generally, the water consumption per acre can be 45-50 kilograms.
Third, the above-mentioned closed herbicides will have different degrees of phytotoxicity once they come into contact with cotton, peanuts, soybeans, and vegetables. Therefore, when spraying the above pesticides, we must follow the following principles: 1. Spray as much as possible when there is no wind, to prevent pesticides from drifting on the wind, such as vegetables, peanuts, etc.; 2. Spray after lowering the nozzle to minimize the drift of the chemical; 3. Wear protective cover and directional spray before spray head.
Fourth, if herbicides are transported to crops such as cotton, peanuts, soybeans, and vegetables, they cause phytotoxicity. Can be sprayed with "natural brassin" 7500 times to ease. It must be emphasized here that the scientific formulation of "natural brassin" is very important. The correct method is: first use a 500 g of 40 ~ 50 °C warm water to a bag of 2 grams of "natural brassinolide" to open, and wash the medicine in the bag, and then gently stir with a wooden stick 2 ~ 3 minutes, this is not only in the uniform, but more important is to intensify its biological activity. After the agent is poured into the sprayer, add 7 to 8 kg of water and stir for 1 minute, then add 15 kg of water. At this point, add 10 grams of urea to each sprayer, and stir for another minute to spray. The purpose of adding urea is not only to quickly provide plants with available nitrogen fertilizers, but more importantly, to soften the cuticle of plant cells so that the liquid can quickly enter the plants.
Fifth, in recent years, due to the poor use of closed herbicides in some areas, some farmers’ friends have simply grown corn and weeds, and then used herbicides such as “Yu Nong Le†and “Yu Hengâ€. 80-90 grams per mu, 30 kg water (2 sprayer water). However, farmers need to be reminded that the best time for prevention and control is when 4 to 5 leaves of corn and 3 to 4 leaves of weeds are used. If you control the corn after 7 leaves, there may be phytotoxicity.
Sixth, pests in corn fields can be mixed with insecticides and herbicides. However, when herbicides “Yu Nongle†and “Yuheng†are used, they cannot be mixed with organophosphorus pesticides and can only be mixed with pyrethroid pesticides. Use the instructions carefully when reading.
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