The growth period of summer maize is from June to September, which coincides with the hot and rainy season, which is good for the occurrence of weeds in the field. Once the control period is missed, it is easy to form grass shortage, which seriously affects corn growth. Chemical weeding is an important measure to control the weed damage in corn fields and increase corn yield. In order to ensure the high yield of summer corn, it is required that the summer corn planting area should do a good job of chemical weeding of summer corn.
First, the object of prevention
According to the investigation of the county plant protection station, the weeds in the summer corn field of our county mainly include: Tianxuanhua, Goosegrass, Xiangfuzi, Matang, Portulaca oleracea, foxtail, thorny vegetables, and wheat blue.
Second, prevention and control technology program
1, after the seedlings
In the 2-5 leaf stage of corn, before the weeds are out to the 5th leaf stage, more than 30 kg of water is used for each mu of nicotinamide, 100 ml of water, and the whole field is evenly sprayed.
2. Directional spraying of killer herbicides between rows
In order to prevent the occurrence of phytotoxicity after corn 7 leaves are removed, it is necessary to stop using the corn seedling herbicide, and the herbicide should be used for directional spraying and weeding. It can be controlled by 20% paraquat 200ml/mu or 20% gram without trace 100-120ml/mu spray.
Third, matters needing attention
1. Use safe and effective herbicides, and strictly follow the dosage instructions. 2, to avoid high temperature weather when spraying, stop spraying when the temperature exceeds 30 degrees, to prevent phytotoxicity, try to choose sunny and windless weather, spray before 9 am or after 4 pm.
3, spray enough water to use, the amount of water per mu is not less than 30 kg, try to use a manual sprayer, spray the liquid evenly on the weed leaf surface, pay attention to avoid the corn heart.
4. When spraying, the corn field is required to have good moisture. When the soil is dry, it must be artificially irrigated (irrigated), and then sprayed with herbicide to prevent phytotoxicity caused by spray when the soil is dry.
5. The sprayer should be thoroughly cleaned after spraying the herbicide to avoid causing phytotoxicity on other crops.
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