Preemergence herbicide effect:
Pre-emergence herbicides are also called soil treatment agents. They are used before emergence of crops after seeding, and can also be used during crop growth. The agent is only fixed in the topsoil layer (about 1-2 cm), and does not leaching to the deep layer. It kills or inhibits the seed of the weed seed crop which can germinate in the topsoil layer due to the protection of the soil layer, and can grow normally. (Note: This "bud" refers to the bud of weeds, not the buds of crops.)
Post-emergence herbicide effect:
Herbicides used after germination of post-emergence herbicide crops. The leaves used to kill weeds.
Pre-emergence herbicide use:
Pre-emergence herbicide is a kind of soil-sealing treatment. It is usually applied for three days before sowing or after sowing, so that weeds can not grow, but the decomposition of the drug in the soil with time is still There will be weeds growing out.
Post-emergence herbicide use:
Post-emergence herbicide is a herbicide used for post-emergence weeding. It is generally used in crop 3-5 leaf stage. Weed 2-4 leaves stage begins to apply to remove weeds, but also according to the type of pesticide and crops. The type of application varies from species to species. For example, rapeseed is suitable for weeding at the 5-leaf stage, wheat is suitable for the 3-leaf stage, and rice can be used for weeding at the first leaf and core.
Common types of pre-emergence herbicides and post- emergence herbicides<br> Pre-emergence herbicides mainly include: acetochlor, pretilachlor, butachlor, pendimethalin, metolachlor, and Ampicillants such as alachlor are mainly herbicides, sometimes different crops, and pre-emergence herbicides are also different.
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