What kind of pesticide is alachlor?

Alachlor is a herbicide, an amide herbicide, and a selective preemergence herbicide, which is what we often call a closed herbicide
.
Alachlor is sprayed on the ground before weeds are unearthed, and it can be absorbed by young weeds and then conducted upwards
.
Weed seeds and roots can also absorb and conduct, but the absorption is very small and the conduction speed is slow
.
Alachlor can infiltrate with soil moisture.
If weeds are unearthed, their roots can absorb alachlor and can be conducted to the upper part of young grasses
.
If the soil moisture is more suitable, after the weeds are absorbed in the young bud stage, they will be destroyed if they are no longer unearthed
.
Symptoms of weeds that have absorbed alachlor are that the growth point of the weeds is tightly wrapped by the sprouts, and the sprouts gradually become thicker due to the absorption of the alachlor, just like the tight curse of the big brother Wukong , Hugged tightly on the top of the weeds, which made the growth points of the weeds unable to drill out and held them inside
.
At the same time, the roots absorbed alachlor and became thin, curved, without fibrous roots, and then gradually turned dark brown and rotted, and then the young grass would never see the sun tomorrow
.
Thinking about it, I blame poor Shangha
.
He died in the soil without seeing the sun, but it was a bit of a contribution .
If the soil moisture is low, the soil moisture will increase with the rain after the weeds are unearthed.
After the weeds absorb the liquid of alachlor that has penetrated into the soil, the grass-like weeds will appear to curl until the whole plant is dead.
Die
.
In broad-leaved weeds, the leaves shrink and turn yellow, and the whole plant gradually withers
.
Alachlor is mainly used to control barnyardgrass, crabgrass, setaria, purslane, quinoa and other annual gramineous weeds, but some broad-leaved weeds
.
However, small-seed crops such as sorghum, millet, rice, wheat, cucumber, watermelon, carrots, leeks, spinach, etc.
, will hardly be unearthed after spraying alachlor.
Do not spray on these crops.

.
Now we are here at the peanut sowing period.
After sowing the peanuts, everyone will spray the occlusive herbicides, such as alachlor, acetochlor, preparachlor, butachlor, and metolachlor before covering the mulch.
Propolachlor etc. .
These herbicides called "grass amine" are all amide herbicides.
Most of them are soil treatment agents.
They are used for weeds before they are unearthed.
A few of them can only be sprayed on stems and leaves.

.
Almost all amide herbicides control annual gramineous weeds and have poor effect on broad-leaved weeds.
They just prevent weeds but not vegetables, and can't handle them with strong growth
.
These amide herbicides called "grasamine" mainly hinder the growth and development of weed seedlings.
They will deform the weed seedlings and cannot be unearthed.
The leaves of grass weeds cannot be unearthed or the leaves cannot be fully unfolded
.
The leaves of broad-leaved weeds shrunk or the veins become shorter, and the leaves look like "cramps"
.
The effectiveness of amide herbicides such as alachlor is mainly affected by the level of soil organic matter content.
The higher the organic matter content, the lower the effectiveness of the herbicide, because a lot of medicinal leaves are adsorbed by the organic matter in the soil.
Increase the dosage, otherwise the effect will be poor, and the use of barren land can be reduced
.