Corn 3-5 leaf stage. Maize 3-5 leaf stage is an important period for weed control in corn fields. If weeds are not timely prevented, it will directly affect the growth and yield of corn. Post-emergence stem and leaf treatment agents can be applied during the 3-5 leaf stage of the corn . To the attention of the 5-leaf stage of corn pesticide spraying, spraying prone to injury after the 5-leaf stage of corn, such as when the temperature also prone to injury when spraying.
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For corn fields with long-term application of closed herbicides such as acetamidine, in the 3-5 leaf stage of maize, when a large number of scented aconite and glutinous rice fields occur, post-emergence stems and leaves such as nicosulfuron or sulfonamide can be used. The treatment agent is sprayed evenly. When the application is uneven or the dosage is large, the corn leaves have a small amount of yellow spots, which can be recovered in a short time, and generally does not affect the growth and yield of the corn. Corn 6-8 leaf stage. For fields that have not been chemically weeded, have poor moisture and have few weeds in the field, we can spray herbicides with both weeding and sealing effects in the 6-8 leaf stage of corn and 50 cm in height of corn . Except the weeds that have emerged in the field, and can be closed without grass. For example, nicosulfuron-methyl hydrazine can be used for directional spraying of water. When applying the medicine, choose windless weather. When directing the spray, be careful not to spray the liquid into the corn bell mouth, otherwise it may cause phytotoxicity. For the early stage of chemical weed control, in the case of rainy days or irrigation, the field where a large number of weeds in the field can be used, can also be sprayed with nicosulfuron-methyl hydrazine. For the field where the application of the closed herbicide in the early stage failed to prevent the fragrant aconite, the scented aconite was basically all emerged, and the fragrant aconite was in the seedling stage, which was a favorable period for control. The water can be sprayed with stems and leaves with sodium dimethyltetrachloride. When applying the medicine, it should be sprayed on the stems and leaves of the fragrant aconite, and try to avoid spraying on the corn. During the application period, the corn 5-6 leaf stage is better, not too early and too late, otherwise it is prone to phytotoxicity.
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The application temperature is too high ( 35 °C), and it is also susceptible to phytotoxicity to corn. Corn 8 leaf stage. In the middle stage of corn growth, for the field where the previous chemical weeding or poor application effect did not control the weed damage, it can be after the corn 8 leaf stage, the corn plant height is more than 60 cm, and the corn stem base is aging and purple. Directional spraying of water with paraquat. When applying the medicine, choose windless weather. When spraying, pay attention to the spraying of the liquid to the corn stems and leaves. Otherwise, it is prone to phytotoxicity.
Source: Jilin Rural Newspaper
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