When the wheat is planted, what about the weeds in the field?
I feel that it is difficult to weed, it depends on whether you will take the medicine? When is the medicine used?
Teacher Xiao Yucheng from Liaocheng, Shandong, gave everyone guidance on the choice of wheat herbicides .
Weed difference:
The peak of weeds in wheat fields occurred twice, the first time was 30-40 days after wheat sowing, and the second was before the second year of wheat jointing.
Generally speaking, most grass weeds emerge before winter, and basically grow with wheat seedlings, such as buckwheat, knotted wheat, etc. Weed seedlings and wheat seedlings are very similar and difficult to distinguish.
Most of the broadleaf weeds occur in the spring, and the seedling stage and wheat seedlings are easy to distinguish.
Key period of weed control in wheat fields
According to the law of weed occurrence in wheat fields, there are two key periods in the prevention and treatment period.
First, prevention before winter
Main control grass weeds
About 10-5 leaves were grown in wheat before about the beginning of November, and weeds generally grew to 2 leaves and 1 heart. (This year, due to late planting, some areas need to be postponed)
Second, spring prevention
Mainly control broadleaf weeds
The time is from late February to early March, and the prevention and treatment period should be early and not too late. It is too late to control weeds, and wheat may cause phytotoxicity.
Prevention points
In the north of Shandong and Henan, there are mainly brome and section wheat, and there are many wild oats in water.
In the video, Teacher Xiao listed some commonly used drugs:
Methyl disulfuron, acesulfame, flufensulfuron, diflufenacil, sodium dimethyltetrachloride
Killing buckwheat
With acesulfame (trade name, priority, buckwheat...) flucarbazone (彪虎...)
Barley-based field
Methyl disulfuron (Shima et al)
Melon, buckwheat and weed mixed
Use methyl disulfuron + (antidote) + flufensulfuron plus diflufenacil + sodium dimethyltetrachloride.
note:
It is necessary to apply the medicine to control the time. The weather temperature is too low to apply the medicine. The choice of sunny weather is beneficial to the effect of the medicine and the safety of the wheat. For example, weeding before winter, if the cold current can not be applied.
Weeding should pay attention to weather temperature and humidity. Generally speaking, when using medicine, the average temperature should be higher than 6 degrees, and it is best from 10:00 am to 3:00 pm. If the soil is dry, pay attention to increase water consumption. If there is water, it will affect the efficacy of wheat herbicides.
More pesticide knowledge , please pay attention to China Pesticide Network
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