When is wheat best for weeding? 90% of farmers don’t know how to control Jijie wheat

The question of whether to apply wheat herbicides (mainly post-emergence, and the following all represent post-emergence herbicides) will become a point of contention every year. Even in the same area, there will be different voices. Some Some farmers think that the effect of herbicides in the past year is good, the main reason is that the resistance of weeds before the year is low; another part of the farmers think that the effect of herbicides after the year is good, the main reason is that the control is complete, who is right and who is wrong, this article content , I will give you a detailed analysis.
Let me give my answer first: herbicides can be used both before and after the year, but it is recommended that everyone use them before the year.
At present, due to different climate, temperature and other conditions in winter wheat planting areas, there are also differences in the time of medication. In fact, medication can be used year after year.
However, according to the growth of wheat and weeds, the general recommendation is to be better before.
The reason is:
First, the weeds just emerged a few years ago, and the resistance to herbicides is not very large.
Second, it is more thorough. After the year, after the wheat ridge is closed, the weeds should not be hit by the herbicide, which will affect the effect of weeding.
Third, some herbicides have some side effects on wheat. The later the spray is applied, the later wheat yield will be affected.

Reasons for recommending herbicides
1. Weeding effect
Under the same conditions, the effect of applying herbicides before the year is relatively better than that after the year. There are three main reasons. One is that the resistance of weeds is small; Three years ago, before the wheat was closed, the herbicide liquid could be directly sprayed on the surface of the weeds, but after the wheat was closed, the amount of the weeds would be reduced. It is said that the weeding effect of the previous year is better than that of the year after (the same external conditions).
2. Weeding cost
From the analysis of the cost of weeding, the number of herbicides in the past year is less than that in the past year. The instructions for use will find that it is used when the weeds are in the 2-4 leaf stage, that is, the dosage is the dosage of the weeds shortly after the emergence of the weeds (years ago), and after the new year, the weeds have reached 5-6 leaves. , or even larger, if you want to achieve the weeding effect, you will increase the dosage accordingly. A set of medicines hit one mu of land before the year, and only 7-8 points after the year, which invisibly increases the cost of medication.
3. Security issues
The safety mentioned here is mainly the safety of wheat. Everyone probably knows that the bigger the wheat, the higher the probability of phytotoxicity after spraying herbicides (relatively speaking), and after the jointing, we can no longer use herbicides. , I have seen some growers, in order to wait for the right weather after the year, the wheat has been jointed and they are still applying herbicides. It is conceivable that the result of waiting is that the wheat has phytotoxicity. While using herbicides (2-4 leaf stage of weeds) a few years ago, phytotoxicity will also occur (incorrect temperature, operation method, etc. during use), but the probability is greatly reduced.
4. The impact of the next crop
Some wheat herbicide formulations will cause phytotoxicity (herbicide residue problems) in individual crops in the next crop, such as the effect of Trisulfuron on peanuts. It is not recommended to plant peanuts, as it is very likely to cause phytotoxicity, and the same herbicide with Trisulfuron-methyl, if used a year ago, will greatly reduce the impact on subsequent crops, or even not occur, and there is an extra 1- 2 months for the herbicide to decompose.
After talking about why you chose to use wheat herbicides a year ago, let’s talk about some precautions when using wheat herbicides (whether it is before or after the year)

Fourth, the use of wheat herbicides precautions
1. When spraying herbicides, the temperature should not be too low, and ensure that the temperature during spraying is above 10 degrees (the temperature difference is large, and the temperature in the morning during the day can be used).
2. When spraying herbicides, it is recommended to choose sunny weather. After 10:00 noon and before 16:00 in the afternoon, do not use it in windy weather.
3. When spraying wheat herbicide, mix the liquid evenly, do not re-spray or miss spray.
In recent years, the occurrence of wild wheat has become more and more serious, and the wild wheat that we often say is actually divided into brome, wild oat, and buckwheat. Because we often can’t tell what kind of wild wheat it is, the medicine is wrong, so that there are more and more wild wheat, which affects the yield of wheat.
Is it suitable to hit wheat field wild wheat now? I believe that farmers and users in many places are concerned about this problem, and this year, there are more wild wheat in the wheat fields than in previous years. In addition, the wild wheat is not easy to control, and farmers are worried that it will affect the wheat production next year.