Is herbicide used in corn field harmful to corn?

I believe many friends have encountered this problem. As we all know, the best use period of corn herbicide is 3-5 leaves. If there is a safety agent, it can be appropriately delayed to 7-8 leaves, and weeds basically grow with corn. The more leaves, the bigger the weeds. So the little assistant has the following three views on this issue:

1, depending on the leaf ratio.

If 70-80% of corn in an acre has 3-5 leaves and only 10-20% or less than 1-2 leaves, then herbicides can be applied at this time, mainly in the field. In this case, weeds should not be difficult to control, and the effect is better. When spraying pesticides, you need to replant.

2. Look at the proportion of replanting

According to the field replanting ratio, if the second replanting ratio is small, below 20%, when the first sown corn reaches about 5 leaves, herbicides can be used, similar to the first point, and most of them are dominant. If replanting grows to about 5 leaves, weeds will be difficult to control and have greater resistance. In addition, the later corn is, the more sensitive it is to herbicides, so it is not too late.

3. Appropriate delay

Some friends will have such worries. If the herbicide is applied early, they will be afraid that the newly grown corn seedlings will be harmed by the drug. If the herbicide is applied late, weeds will become resistant and difficult to control. Therefore, this situation can be compromised and beaten in a few days, because the seedling stage of corn is very fast. When the first sowing grows to about 7 leaves, the second replanting grows to about 3 leaves. At this time,

That's all the little assistant said about this question first. To sum up, this question should be analyzed in detail, and there is no absolute answer. I hope this article can bring some help to everyone. If you have any other questions, you can leave a message in the comments below and reply after seeing it.