1. Weeding principle: Glyphosate is an organophosphorus systemic herbicide, which leads to plant death by inhibiting the activity of related enzymes in plants. Paraquat is a quick-acting contact herbicide, which has a strong destructive effect on plant green tissues and can take effect 2-3 hours after spraying. 2. Action time: The action time of glyphosate on weeds is generally when weeds grow most vigorously, and spraying paraquat should also be carried out at noon on sunny days.

First, the difference between paraquat and glyphosate

1, weeding principle

(1) Glyphosate is an organic phosphorus systemic herbicide, and its weeding principle is to kill plants by inhibiting the activities of related enzymes in plants.

(2) Paraquat is a quick-acting contact herbicide, which has a very strong destructive effect on the green tissues of plants, and can take effect in 2-3 hours after application.

2. Action time

The action time of glyphosate on weeds is generally when weeds grow most vigorously, and paraquat must also be sprayed at noon on sunny days.

3. Toxicity

(1) When glyphosate is taken by mistake, it usually takes 15 minutes to produce dizziness, nausea, limb weakness, sore throat and other symptoms.

(2) Paraquat can be killed by taking 3ml by mistake, and there is no specific medicine, and the mortality rate is over 90%.

4. Market situation

At present, glyphosate has become the most widely used herbicide in the world, and paraquat stopped production on 20 14.

Second, the harm of glyphosate to soil

1, glyphosate will be passivated when it meets the soil, and some substances in the soil will react with glyphosate, so it will not cause harm to the soil. Glyphosate has certain internal absorption and good weeding effect. When glyphosate is used to weed in the field, it takes about 1 week to clear the dead weeds, and then soil preparation can be carried out without affecting sowing and crop growth.

2. Glyphosate is a systemic and conductive herbicide, and attention must be paid to prevent the drug mist from drifting to non-target plants, causing phytotoxicity. Glyphosate will lose its activity after complexation with calcium, magnesium and aluminum plasma, so clean soft water must be used when diluting pesticides. If muddy water or dirty water is added, the efficacy will be reduced. You can't mow, graze or turn over the ground within 3 days after using glyphosate.

3. The use of glyphosate is generally better in sunny days and high temperatures. If it rains within 4-6 hours after spraying, it must be sprayed again. Glyphosate is acidic, so plastic containers must be used for storage and use, and spraying equipment should be cleaned repeatedly. Note that when the glyphosate package is damaged, moisture regain and caking may occur under high humidity, and crystallization may also occur when stored at low temperature. Therefore, the container must be shaken when it is used to dissolve crystals to ensure efficacy.