Our food is a big country, mainly on field crops, field crops during growth and in the fields weeding is a very important part, of course, this is actually not the lack of participation of herbicides, herbicide use mainly foliar treatment and soil treatment Two methods, then how do they choose herbicides?
First, stem and leaf treatment: mainly including pre-sow stem and leaf treatment, post-emergence stem and leaf treatment and post-emergence directional spray.
1. The stem and leaf treatment before sowing is to kill all the weeds that have been unearthed with a herbicide such as gram-free or glyphosate. Since the crop has not been planted at this time, weeds can be safely and effectively eliminated.
TIPS: Analysis of the role of gram-free and glyphosate
Glyphosate is a systemic herbicide. It takes a long time to plant the crop to ensure that it will not affect the growth of the subsequently planted crops, and the trace of the herbicide is not touched, and it will not passivate. Affecting crop growth, it can be applied two days before planting or even on the day of planting. However, this method is difficult to control for weeds. In order to solve this problem, you can use the combination of Kru and Kendall, called "one kill."
2, post-emergence stem and leaf treatment is the use of selective herbicides, such as 2,4-D, benzenesulfuron, flufenacil, etc., to prevent weeds growing around the crop and between rows. When selecting stem and leaf treatment agents, pay special attention to the length of the residual period of the herbicide. Some herbicides have a long residual period, especially some sulfonylureas. The residual period in the soil is several years, for the later crops. The hazard is serious.
3. Directional spray after seedling refers to the use of a protective cover and other protective devices, which can be used to remove herbicides such as gram-free herbicides.
Second, soil treatment: mainly including post-emergence soil treatment and post-emergence soil treatment.
1. After sowing, the soil treatment before seedling is to treat the soil with herbicides such as acetochlor, butachlor, ezetimibe, and pretilin before seeding, so as to block the unearthed weeds. .
TIPS: Analysis of the effects of acetochlor and butachlor
Acetochlor and butachlor have an inhibitory effect on the growth of many crop roots, and the damage is more serious in the cold and rainy seasons and regions. On crops that are more sensitive to cash crops and vegetables, it is best not to use acetochlor.
2, the post-emergence soil treatment is to carry out soil treatment after planting and planting, for example, using herbicides such as acetochlor, grass herbicide and chlorpyrifos to toxic soil after rice transplanting, to prevent newly germinated weeds. For larger weeds, stem and leaf treatment is often required.
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