How long is the residual time of herbicide The principle of herbicide weeding

1.Acetochlor: The duration of action is generally about 56-70 days.

2.Meolachlor: The digestion half-life is generally about 26 days (depending on soil texture, local climate and other factors), and the duration is generally about 56-84 days.

3.Methachlor: The duration is usually about 60-80 days.

4.Buchlor: The digestive half-life is usually about 30 days, and the duration is usually about 42 days.

1.How long does the herbicide remain in place?

The residual time of a herbicide in the soil is related to its own type, and different herbicides have different durations.

1.Acetochlor.

Generally, the soil can be sealed after sowing and before emergence, and the duration is about 8-10 weeks.

2.Meolachlor.

The digestive half-life is usually around 26 days, and the duration is usually around 8-12 weeks. Due to factors such as soil texture, local climate, etc., the digestive half-life will vary. For example, when used in Shandong, the digestive half-life of the drug in the soil is generally about 10-12 days, and when used in Jilin, the digestive half-life of the drug in the soil is generally about 16-17 days.

3.Meolachlor.

The duration in the soil is generally 60-80 days.

4.Buchlor.

The half-life of digestion in soil is about 30 days, and the duration is about 42 days.

5.Enemy stuff.

The digestive half-life in rice plants and soil is generally around days and days.

6. Pendimethalin.

The half-life in the soil is generally about days, and the residual period is generally about 42-63 days.

7.Nifepyridine.

The half-life in soil is generally 12-26 days.

8.Prometheus.

The duration is generally around 20-70 days.

9.Pyrisulfuron.

The half-life of digestion in field water and soil is about days and days, respectively, and the duration is generally about 25-35 days.

10.Enema Grass Dragon.

The drug has low water solubility, less dissolution in the soil, and has a duration of about 8-16 months. If the dose is lower, the duration is about 2-3 months.

Summary. Different herbicides have different action time, so their toxic residues are also different, generally ordinary herbicides have a toxic residual time of about 7-20 days, and some more toxic herbicides, the toxic residual time can be as long as 1-2 years, or even longer.

What kind of herbicide do you refer to?

Spray weeds. Different herbicides have different action time, so their toxic residues are also different, the general ordinary herbicide toxic residue mountain judgment time is about 7-20 days, some more toxic herbicides, the toxic residue time can be as long as 1-2 years, or even longer.

How long does the diquat herbicide last.

The residual period of diquat dichloride salt is more than 26 days.

Is it still toxic after remaining for half a year?

It is gone in half a year, and the toxicity is generally degraded in two months.

The sprayer used to spray herbicide half a year ago sprinkled a little on the crab, can the crab still eat it.

Do not eat, degradation does not mean that there is no toxicity at all.

Can't you eat crabs alive?

No. Because some pesticide ingredients are only harmful to humans.

<> polluted land: After spraying, components that are not absorbed by weeds will exist in the soil, resulting in land contamination, and the residual period of some herbicides can reach more than 36 months.

Deterioration of soil quality: Prolonged and heavy use of herbicides can turn the land into "cancer fields" where crops are difficult to change and yields are low.

Affect production: Residual herbicides can contaminate groundwater and easily cause pesticide damage, resulting in reduced or no crop yields.

1. What are the hazards of herbicides to the soil?

1. Polluting the land.

After the use of herbicides, the components that are not absorbed by the weeds will be free in the soil, resulting in soil contamination, and some herbicides can even have a residual period of more than 36 months.

2. Soil quality declines.

1) Long-term excessive use of herbicides can lead to "cancer" of the land, that is, it becomes a "cancer field", and it is difficult to change the crop in such fields, and the yield is low.

2) At present, there are large areas of "cancer fields" in Jilin Province, Heilongjiang Province, Northeast China and other places.

3. Affect production.

During agricultural production, about 20-70% of the herbicides commonly used will remain in the soil for a long time, and the residual components will pollute the groundwater, which will lead to reduced crop yields or even no harvest when pesticides occur.

2. How long is the residual period of the herbicide

1. Prochlor.

The shelf life in the soil is about 60-80 days.

2. Arachonard. The average digestion half-life in rice plants and soil is about 2 days.

3. Enylacene.

The half-life is about 12-26 days.

4. Pendimethalin.

The half-life in the soil is about days, and the residual effect period is about 42-63 days.

5. Acetochlor.

It can be used for closed treatment after sowing and before emergence, and the duration of the treatment is 8-10 weeks.

6. Diuron.

The duration of the effect is about 8-16 months, and about 2-3 months when the dosage is small.

7. Grass net.

The validity period is about 20-70 days.

8. Buchlor.

The half-life of digestion in soil is about 30 days, and the duration of effect is about 42 days.

9. Meolachlor.

The digestion half-life is about 26 days, and the duration of effect is about 8-12 weeks.

10. Pyrisulfuron.

The half-life of digestion in soil is about days, and the half-life of digestion in field water is about days, and the effective period is about 25-35 days.

1. The residual time of herbicide in the soil is generally 4-24 months. However, different herbicides have different residues in the soil, so they need to be treated differently.

2. Herbicides refer to agents that can make weeds die completely or selectively, also known as herbicides, which are used to eliminate or inhibit the growth of plants.

3. Among them, sodium chlorate, borax, arsenate and trichloroacetic acid have a dead effect on any kind of plants, and their effects are affected by three factors: herbicides, plants and environmental conditions. According to the function, it is divided into incidal and selective herbicides, and most of the selective herbicides, especially nitrophenol, chlorophenol, and carbamate derivatives, are effective. The development of herbicides in the world has gradually stabilized, mainly developing varieties with high efficiency, low toxicity, broad spectrum and low dosage, and disposable treatment agents with little environmental pollution have gradually become the mainstream.

4. The commonly used varieties are organic compounds, which can be widely used to control weeds, shrubs, trees and other harmful plants in farmland, orchards, flower nurseries, grasslands and non-cultivated land, railway lines, rivers, reservoirs, warehouses and other places.