1. Consider the herbicides that have absorption-conducting type and contact-killing type from the absorption mode. Internally-trapping herbicide refers to a spray that is absorbed by a certain leaf of a plant and can be led to another leaf. After being absorbed by the plant root, it can be transmitted to flowers, fruits or roots. Contact killer herbicide refers to a certain leaf that is sprayed on the plant and will not be transmitted to other leaves, and will not be transmitted to the roots, flowers and fruits of the plant. Similarly, contact-killing herbicides sprayed onto the surface of the soil are not transmitted through the roots to the leaves, stems, flowers, and fruits. In the vegetable field, contact herbicides should be used as far as possible, and if they are used, such as herbicides, herbicides, etc., or herbicides with poor conductibility in the herbicides that are transported by the herbicide, such as herbicides. 2. Considered from the treatment method According to the treatment method of herbicides, it is divided into stem and leaf treatment herbicide and soil treatment herbicide. 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 result in the failure of sprouting vegetables or germination. Sulfonylureas and imidazoline herbicides are strictly prohibited before vegetable plots. It is even more inappropriate to use Simazine and Fumeron that will poison soil. 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. Rice fields that are too fast to kill crickets should not be used as vegetable land. 3. Formulations considering herbicides include powders, emulsifiable concentrates, liquids, granules, soluble powders, smoke sprays, oils, suspensions, and tablets. Herbicides are added to various types of herbicides. Such as solvents, wetting agents, emulsifiers, suspending agents or stabilizers, etc., the introduction of these additives will increase the toxicity of herbicides, but also increase the possibility of the occurrence of phytotoxicity, vegetable fields should try to avoid the application of emulsifiable concentrates, oils , suspending agents, smoke agents and tablets. 4. Consider the use of herbicides with strong irritating odors as far as possible from the odor and pollution degree of protected vegetables and greenhouse vegetables. Some herbicides have caused pollution and contamination of the containers. For example, the use of 2,4-D butyl ester within 2,000 meters upwind of trees and 500 meters downwind may harm vegetables. Sprayers sprayed with 2,4-D butyl ester, even when cleaned, spray other herbicides on vegetable fields and injure the vegetables. In addition, butachlor, trifluralin, herbicidal dan, and large glutenous must not be used in vegetable fields. Excerpt from: China Pesticide Network
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