Recently, it is the time for weeding of summer corn seedlings, and weeding after corn seedlings is an indispensable task for corn growers. Corn post-emergence herbicides need to be played every year, but many farmers are still not clear, and even the herbicides caused by corn seedlings will cause corn damage, but hinder the growth of corn. So what are the main products of corn post-emergence herbicides? What should you pay attention to when you fight drugs? Let's take a look at it with Xiaobian.
1. Corn seedling herbicide products
At present, the corn post-emergence herbicides commonly found on the market mainly include nicosulfuron, mesotrione, oxazolone, octanoyl bromoxynil, sodium 2-methyltetrachloride, atrazine and the like. Nicosulfuron is very commonly used. It is a systemic herbicide. It usually takes effect in 5-7 days after spraying. The grass will die in about 2 weeks. It can control most weeds in corn fields and is ineffective against castor. The mesotrione is a contact herbicide, which takes effect 3 days after spraying and 7-10 days of weeds will die. It can be used to control most of the weeds in corn fields, but it is not effective against foxtail. Atrazine is also commonly used. It is also a systemic herbicide. It can be used to seal weeding, and it can also kill 2-4 leaves of grass. The soil has a long residual period, and it has a cruciferous crop and vegetables for the scorpion. Special attention should be paid to residual phytotoxicity.
Second, the precautions for corn herbicides
1, read the instructions
When many friends fight drugs, they actually do not have the habit of reading the instructions. They use the drugs according to their own ideas, but this is extremely wrong. Because herbicides are not available for all corn varieties, many herbicide products will be marked with instructions such as “Prohibition of use of corn inbred lines, sticky corn, etc.â€. If used rashly, weeding at the same time It will cause phytotoxicity to corn.
2, spray "low" does not spray "high"
The "high and low" here is not the height at the time of spraying, but the temperature of the weather. If the temperature is too high when spraying, it will quickly evaporate the water in the medicine, which will increase the concentration of the herbicide, which will easily cause phytotoxicity, and will also affect the amount of herbicide entering the weeds, failing to achieve the effect of weeding. . The time suitable for spraying herbicides is before 9 am and after 5 pm of the day.
3, the drug should pay attention to mixing
Many friends sprayed insecticides when they sprayed their herbs to mix their herbicides and pesticides or just sprayed the herbicides. However, this practice is not recommended. The composition of the current herbicide is mainly nicosulfuron-methyl. If it is mixed with organophosphorus pesticides, it is easy to cause phytotoxicity. Therefore, it is best not to spray organophosphorus pesticides within one week before and after herbicide application. If you really have to kill insects, try to choose pyrethroid pesticides.
4, spraying time
When spraying, try to mix the chemicals as much as possible. It is best to "double dilution". The time of spraying the herbicide should also catch 2~5 leaves of corn. The weeds are in the time from 2 leaves to 4 leaves. If the time is too late, the weed roots are fully developed, the vitality is strong, and the resistance is improved. The herbicide effect is reduced. However, if you miss the time and must weed it, you should lower the nozzle and spray the medicine in the direction of the ridge.
The above are the main products and precautions for corn post-emergence herbicides. Regardless of which herbicide, the dosage must be used in accordance with the instructions of the drug. Do not increase or decrease the dosage. In addition, sweet corn, seed farming, and inbred lines are more sensitive to herbicides, and farmers should be careful to use the above precautions.
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