When July is in full swing, the sale of corn herbicides is almost the same. Herbicide harm occurs everywhere, and we also analyze and summarize the corn herbicide injury situation.
With the improvement of productivity, there is an increase in the number of non-workers in rural areas, and the area of ​​application of chemical weeds has continued to expand. Especially in recent years, more and more types of herbicides have been used postemergence corn seedlings, medication time is not fixed, soil moisture and drug dosage, etc. For various reasons, more and more corn seedling herbicides have appeared in recent years.
The herbicides produced by corn herbicides mainly appear in the leaves of corn seedlings, causing some morphological changes such as roots, leaves and leaves, such as chlorosis or bleaching of leaves, distortion of heart leaves, undeveloped aerial roots, and more severe cases, which can lead to corn. Seedlings stop growing and become seriously deformed and dwarfed, which has a major impact on yield.
Causes of phytotoxicity
1. High temperature and drought. In the high temperature, dry weather spray, due to spraying under high temperature conditions, strong light, the liquid volatile, spray liquid after a while will evaporate, its strong transpiration will accelerate the corn seedlings phytotoxicity.
2. Improper application of the method, mixed with random. After the six-leaf period of corn application, it is not directed to spray, even mixed with insecticides, and a large amount of liquid is applied to corn leaves to cause phytotoxicity. Even when mixed with organic phosphorus pesticides, corn is prone to phytotoxicity.
3. Improper use of drugs. Nicosulfuron is susceptible to phytotoxicity before or after the second leaf stage of maize.
4. The amount of medication is too large and the water consumption is small. Any crop can not completely resist the herbicide's harm, blindly increase the dosage, corn is prone to phytotoxicity.
5. Spray uneven, heavy spray or missing spray.
6. It is vulnerable to cold weather and rainy weather after treatment.
7. Sweet waxy corn and popcorn corn, Denghai series of corn, sensitive to some herbicides.
How to prevent injury
First of all, according to the soil, weather conditions, grass conditions to determine the amount of drug, even spray, no heavy spray, no leakage spray. Look at the weather forecast before treatment, choose the best time for application, and apply after 5 pm, because after one night after spraying, the liquid will be fully absorbed and utilized by the leaves, so that no phytotoxicity will be produced, and the effect will not occur. It will be the best. Do not mix with organophosphorus pesticides and use them after 7 days.
Second, we must strictly control the appropriate period of application of herbicides for corn varieties. The 3 to 5 leaf stage of maize is the most resistant to herbicides and has a small age of grass. At this time, the use of drugs is the safest. The corn should be sprayed after the 6th leaf stage to avoid contact with the corn leaf.
Furthermore, it is necessary to increase the level of application, increase the amount of water used, use sprayers with good performance, and strictly prohibit the use of mist sprayers.
Pharmacy remedies
When the corn planted with phytotoxicity is slightly phytotoxic by the herbicide, the growth is temporarily inhibited and no treatment is required. The corn can be recovered after a period of time without affecting the yield. If the phytotoxicity is heavy, the following measures can be taken:
1. The cultivator loosens the soil and increases the vitality of the root system. A sufficient amount of water is poured to make a large amount of water absorbed by the roots of the corn to reduce the concentration of herbicides in the plants, and to apply nitrogen fertilizer in conjunction with watering to promote the growth of roots, increase the growth rate of corn, and alleviate the injury of the crops.
2. Foliar application of plant growth promoters, or brassinolide and potassium dihydrogen phosphate spray, etc., can promote the early recovery of the victim plant.
3. Cut the twisted heart to promote growth.
4. Prevent and treat pests and diseases as soon as possible after corn emergence. Adding potassium dihydrogen phosphate or a large amount of water-soluble fertilizers to increase the yield of corn after spraying can make the corn grow robustly and improve its ability to resist phytotoxicity.
5. Special attention should be paid to the fact that the general damaged corn fields can be quickly restored, but if the above measures do not alleviate the symptoms of drug damage, they should be destroyed or replanted as soon as possible.
Actually, corn herbicides require the application of pesticides, including when introduced to customers, they try to spray all over the field. Corn and wheat are different. Many of the weeds in corn fields are hidden under the corn seedlings. The speed of going is fast, naturally it will not be so uniform, it will definitely affect the weeding effect. No matter how good the product will not show particularly good results, it will not be able to fight corn or weeds. The drug will be evenly distributed. The most important thing is that the people are not distributors. He will not take any responsibility. You tell him that he will not spray or spray. However, if you tell him that he can spray all fields, he will surely carry it. The sprayer ran very quickly, affecting the efficacy of the application or blaming the product for not being good. Of course, some people may say that the safety cover can be used. However, the mist of the liquid sprayed by the sprayer will fall into a drop shape when it hits the wall of the safety cover. Instead, it will be more likely to cause damage. Therefore, we are selling. When weaving corn herbicides, try to speak clearly to our customers, and speak out the pros and cons and choose them in the hands of customers.
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