How to weed corn under high temperature? Old farmers say there are "four fears" about corn weeding. What are they afraid of?

For summer corn planting areas, after entering late June, the sowing has basically been completed, and the corn sown in early to mid-June has entered the seedling stage and is about to usher in the peak period of weeding.

Compared with spring corn, summer corn is sown about 2 months later, and weather factors such as temperature and humidity are different. Therefore, there are also differences in weeding.

When weeding summer corn, if you want to achieve good control effect without causing phytotoxicity, you need to pay attention to avoid four kinds of wrong behaviors, which are the "four fears" of summer corn weeding that veteran farmers often say. What do these "4 fears" specifically refer to? What are you afraid of? The little helper in this article will tell you in detail. Friends will have the answer after reading it.

The first fear: applying herbicides due to drought in the field

When applying herbicides to summer corn, it is during the high temperature period. If there is no local rainfall and the field soil is relatively dry, not only the corn will absorb the Without sufficient water, weeds will not be able to absorb sufficient water. Coupled with high temperatures, in order to reduce the transpiration of their own water, weeds will close the pores on their leaves, although not all of them.

However, when the herbicide solution is sprayed, the amount of herbicide solution that can be absorbed by the weeds is greatly reduced, reducing the weeding effect.

So, I am more afraid of applying herbicides during high temperatures and droughts.

The correct approach is to water first and then apply herbicide. For dry plots, after watering, the weeds that have not emerged will be promoted to emerge from the ground. At the same time, after the water is replenished, the weeds will grow on the leaves. pores open.

Apply herbicides 1-2 days after watering. Not only is the control effect good, but overall weed control is relatively thorough.

Second fear: applying herbicides when the temperature is high at noon

The temperature is very high at noon in summer, and high temperatures of 35-40 degrees are also common. If you choose to apply herbicides at noon, After the herbicide is sprayed, the liquid will evaporate quickly. The faster the evaporation rate, the less liquid will be absorbed by the weeds, and the worse the control effect will be.

Therefore, I am more afraid of the hot and sunny weather in summer, and apply herbicides between 10-16 o'clock.

The correct approach is to avoid the high temperatures at noon and apply herbicides before 9 a.m. or after 16 p.m. The helper also recommends that you apply herbicides after 16 p.m. After spraying , ushering in the night, the temperature is low at night and the evaporation is slow, which is more conducive to the absorption of weeds and improves the weeding effect.

At the same time, avoid applying herbicides during high temperatures to reduce the chance of heat stroke.

Third fear: The dosage of herbicide is too high

There will be a lot of wheat stubble in the fields where summer corn is planted, and weeds grow in the wheat stubble. Some friends think that, It is necessary to increase the dosage of herbicide to improve the weed control effect.

This idea is correct, but it should be noted that it is okay to increase the dosage appropriately. If the dosage is increased too much, in addition to increasing the cost, it will also increase the chance of herbicide damage to corn.

In a high temperature environment and low rainfall, the growth of corn will be relatively weak. If the amount of herbicide is too large, the weed control effect will be very good, but the corn will also be controlled at the same time. .

Unlike corn grown under normal conditions, corn grown under conditions of suitable temperature and sufficient moisture has a relatively strong recovery power. After absorbing the herbicide liquid, it will quickly recover on its own.

Corn grown under conditions of high temperature and excessive drought has a weak recovery ability. After absorbing herbicide liquid, it is easy to suffer from herbicide damage.

The correct way is to spray the herbicide according to the dosage in the instructions. The herbicides on the market are generally one set per acre or one bottle per acre, sprayed at the 3-5 leaf stage. If applied, weeds can basically be controlled.

Even if you want to increase the dose, it is recommended to increase it by about 20% and not too much.

Fourth fear: Apply herbicides without looking at the corn variety

There are many varieties of corn, such as ordinary corn, waxy corn, sticky corn, etc. Different varieties use different We should pay attention to corn herbicides, as they vary, and if used incorrectly, the chance of phytotoxicity will increase.

The most common herbicides used on corn are nicosulfuron and mesotrione. However, when nicosulfuron is used on sticky corn or waxy corn, it is easy to cause phytotoxicity. Some farmers I was not clear about this problem, and when I went to buy the herbicide, I did not explain it clearly to the salesperson in detail. As a result, pesticide damage occurred after arriving.

The correct approach is that if you grow sticky corn, waxy corn, etc., when you buy herbicides, you must make it clear to the salesperson to avoid treating them as ordinary corn.

The above-mentioned "four fears" are often made by farmers in the actual process of planting corn. Therefore, after reading this article, everyone must pay more attention and don't let these "four fears" happen. .

Finally, here is a tip for farmers. When spraying herbicides in high temperatures in summer, especially when the field moisture is not very good, you can add more water. For example, one set of herbicides can be used for one bucket of water per acre. If the land is divided into one set of pesticides and two barrels of water per acre, the amount of herbicide used is still the same, but the water consumption has increased, which can improve the weeding effect.

The above is the relevant content about summer corn weeding. What do you think about this?