Introduction: paraquat

Two days ago, we received a message from netizens in Yunnan: there are many kinds of herbicides, often see paraquat, but do not understand the characteristics and scope of use of paraquat. Paraquat is a kind of rapidly extinct herbicide with contact killing effect and certain internal absorption effect. It can be quickly absorbed by plant green tissue and make it withered. It has no effect on non-green organizations. It is quickly combined with soil and passivated in soil, but has no effect on plant roots, perennial underground stems and persistent roots. Paraquat is extremely toxic to humans, so pay special attention to protect yourself when using it. Characteristics of use: the active ingredient of the agent has a strong destructive effect on the chloroplast membrane, which stops photosynthesis and chlorophyll synthesis very quickly, and the leaves begin to change color 2-3 hours after spraying. Kewuzhuan has a strong destructive effect on the green tissue of monocotyledons and dicotyledons, but there is no conduction, it can only damage the part of the drug, can not penetrate the corky bark, and is easy to be passivated after contact with soil. The root of the plant and the hidden seeds in the soil could not be destroyed, so the weeds regenerated after application. Scope of application: it can control all kinds of annual weeds; it has strong killing effect on perennial weeds, but its underground stems and roots can sprout new branches; it has no effect on lignified brown stems and tree trunks. It is suitable for controlling weeds in orchards, mulberry orchards, rubber orchards and forest belts, and can also be used to control weeds in non-cultivated land, ridges and roadsides. Directional spray can be adopted to control weeds in wide rows of crops such as corn, sugarcane, soybeans and nurseries. Use skills: 1. Orchards, mulberry orchards, tea gardens, rubber gardens, forest belts are used in the weeds, in the peak period, with 20% water agent 100ml-200ml per mu, 25kg of water, evenly spray the stems and leaves of weeds, when the weeds grow above 30cm, the dosage should be doubled. two。 Wide-row crop fields such as corn, sugarcane and soybean can be treated with pre-sowing or post-sowing pre-treatment, and protective directional spray can also be used to control inter-row weeds in the middle and later stages of crop growth. Pre-sowing or post-sowing pre-seedling treatment, use 20% water agent 75-200 ml per mu, spray 25 kg of water to control unearthed weeds. During the crop growing period, use 20% water agent 100-200 ml per mu and 25 kg of water for inter-row protective directional spray. 3. Practical experience shows that paraquat has no obvious effect on Rehmannia glutinosa.