Latest Corn Weeding Precautions: Key Points Explained at Once
Corn is a major food crop in our country, and its planting area in our country is also very large. When planting corn, our manual management work is very important, especially weeding work. Reasonable weeding is the key to ensuring robust corn growth and improving yield and quality. Therefore, there are many things we need to pay attention to when weeding. So what precautions should be taken when weeding corn? Let's take a look together below!
1. Weeding time
After spraying herbicide on corn seedlings, it generally takes about 3-5 hours for absorption, and during this time, the efficacy of the herbicide is very closely related to temperature and humidity. If the pesticide is sprayed during a period of high temperature and drought, then because of strong light and high temperature, the evaporation speed of the liquid will also become faster. After spraying, the liquid will evaporate immediately, thereby affecting the weeding effect, and corn seedlings are also very prone to phytotoxicity. Therefore, it is best to spray in the evening each day. At this time, the temperature is not high and the humidity is relatively high, so the herbicide can be fully absorbed and the incidence of phytotoxicity can also be reduced.
2. Weed size
After spraying herbicide, many farmers have a misunderstanding: they think that the smaller the weeds are, the easier they are to kill, and there is no need to worry too much. In fact, this is a wrong idea, because if the weed area is too small, then the area that receives the pesticide is also very small. Therefore, its weeding effect is not ideal compared with larger weeds. So it is best to weed when the weeds have grown to a certain size. Usually, it should be when the weeds have grown to the two-leaf-one-heart to four-leaf-one-heart stage. At this time, the weeds not only have a certain area to receive the pesticide, but their resistance is also relatively low, and the weeding effect will also be more obvious.
3. Corn seedling size
When spraying herbicide to weed, we should not only pay attention to the size of the weeds, but also pay attention to the size of the corn seedlings. It is best to spray herbicide when the corn seedlings have two to five leaves. Because at this time, the resistance of the corn seedlings is relatively high, which can reduce the risk of phytotoxicity. Before the leaf stage, field spraying can be carried out. If spraying is done after the six-leaf stage, then attention should be paid to the position of the nozzle; it must not be too high, and spraying should be directed toward the corn plants. Avoid the liquid pouring into the whorl and causing phytotoxicity to the corn seedlings. At the same time, it must not be sprayed too early, otherwise it is very likely to cause the death of corn seedlings.
4. Weed stress resistance
We should also pay attention to the stress resistance of weeds, because in recent years, continuous spraying of herbicides has enhanced the resistance of weeds to the chemicals. The stress resistance of the weeds themselves is also continuously increasing, and in order to avoid excessive water evaporation, weeds will grow relatively gray-white and short. This kind of weed generally has fine hairs all over its body, mainly to reduce water evaporation. Therefore, when spraying the chemical, the liquid is easily “blocked” by these fine hairs, and in addition, the absorption capacity of the weeds themselves is not strong, so the pesticide effect is naturally not very obvious. Therefore, when applying the chemical at high temperature, we should pay attention to increasing the dosage as much as possible to ensure the pesticide effect.
The above is a brief introduction to the precautions for corn weeding. In addition, we should also pay attention to various issues such as weed species and pesticide mixing to avoid affecting the pesticide effect. That is all for today's introduction. Thank you all for reading and supporting.