Paraquat Herbicide Introduction: A Comprehensive Guide in One Article
A farmer called: When selling vegetables grown nowadays, they are often asked whether there are pesticide residues. What are the consequences of pesticide residues? Answer: Pesticide residues are the portion of pesticides that remain directly or indirectly in grains, vegetables, fruits, livestock products, aquatic products, and... after pesticides are applied in agricultural production.
A couple of days ago, we received a message from a netizen in Yunnan: There are many types of herbicides, and paraquat is often seen, but I do not understand the characteristics and scope of use of paraquat.Paraquat is a fast-acting non-selective herbicide with contact action and a certain systemic action. It can be quickly absorbed by the green tissues of plants, causing them to wither and die. It has no effect on non-green tissues. In soil, it quickly binds to the soil and becomes deactivated, and it is ineffective against plant roots, perennial underground stems, and perennial roots. Paraquat is extremely toxic to humans, so special care must be taken to protect yourself when using it.
Use characteristics:
The active ingredient of this agent has an extremely strong destructive effect on chloroplast thylakoid membranes, causing photosynthesis and chlorophyll synthesis to stop quickly. Leaves begin to suffer damage and change color 2-3 hours after the agent touches them. Gramoxone has a very strong destructive effect on the green tissues of both monocotyledonous and dicotyledonous plants, but it has no translaminar movement, so it can only damage the part it touches. It cannot penetrate suberized bark, and after contact with soil it is easily deactivated. It cannot destroy the roots of plants or seeds lurking in the soil, so weeds may regrow after application.
Scope of application:
It can control various annual weeds; it has a strong killing effect on perennial weeds, but their underground stems and roots can sprout new shoots; it has no effect on already lignified brown stems and tree trunks. It is suitable for controlling weeds in orchards, mulberry fields, rubber plantations, and forest belts. It can also be used to control weeds on non-cultivated land, field ridges, and roadsides. For wide-row crops such as corn, sugarcane, soybeans, and nurseries, directed spraying can be used to control weeds.
Application techniques:
1. Use in orchards, mulberry fields, tea plantations, rubber plantations, and forest belts. When weeds have emerged completely and are in the vigorous growth stage, use 100-200 ml of 20% aqueous solution per mu, mix with 25 kg of water, and spray evenly on weed stems and leaves. When weeds grow to more than 30 cm, the dosage should be doubled.
2. Use in fields of wide-row crops such as corn, sugarcane, and soybeans. It can be applied before sowing or after sowing and before emergence, or in the middle and late stages of crop growth, protective directed spraying can be used to control weeds between rows. For pre-sowing or post-sowing pre-emergence treatment, use 75-200 ml of 20% aqueous solution per mu, mix with 25 kg of water, and spray to control weeds that have already emerged. During the crop growing period, use 100-200 ml of 20% aqueous solution per mu, mix with 25 kg of water, and apply protective directed spraying between rows.
3. Practical experience shows that paraquat has no obvious effect on Rehmannia glutinosa.