How to choose herbicides

1, absorption method. Herbicides have internal absorption and contact toxicity. After being absorbed on a certain leaf of a plant, the system of aspiration-inducing herbicide can be transmitted to other leaves and flowers, fruits or roots. The contact killer herbicide sprays onto the surface of the soil or a certain leaf of the plant and will not be transmitted to other leaves and will not be transmitted to the roots, flowers and fruits. Vegetable field should try to choose the contact herbicide, if Seoul, evil grass spirit, etc., or use the suction of poor herbicides, such as weeding pass. 2, processing methods. Herbicides are treated as stem and leaf herbicides and soil treatment herbicides. After treatment with herbicides, stem and leaf treatments generally do not produce residual period in the soil. After the soil treatment herbicide sprays, it will remain in the soil for a certain residual period, ranging from a week to many years or longer. This residual period will cause dead vegetables after sprouting or sprouting. Sulfonylureas and imidazoline herbicides are strictly prohibited before vegetable fields. Leafy vegetables try not to treat herbicides with stems and leaves, and rooted vegetables should be treated with herbicides such as amides and dinitroaniline herbicides. 3, dosage form. Herbicides of various formulations have been added with additives, such as solvents, wetting agents, and emulsifiers. These additives will increase herbicide herbicides, but also increase the possibility of phytotoxicity. In vegetable fields, herbicides such as emulsifiable concentrates, suspensions, smokers and tablets should be avoided. 4, smell and pollution degree. Protected vegetables should avoid the use of herbicides with strong irritating odors. Some herbicides may cause pollution or pollution to the containers. For example, 2,4-D butyl esters may be used to damage vegetables when they are used within 2,000 meters upwind and downwind within 500 meters. Containers that have been sprayed with 2,4-D butyl esters will damage the vegetables even if they are washed clean. In addition, herbicides such as butachlor, trifluralin, herbicidal dandan, and glutinous glutenous can not be used in vegetable fields.

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