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2. Considering the treatment method According to the treatment method of herbicide, it is divided into stem and leaf treatment herbicide and soil treatment herbicide. After spraying the herbicides on the stems and leaves, there is generally no residual effect in the soil; after spraying the herbicides, the soil will remain in the soil for a period of time, from one week to more than one year or longer. This period of residual effect will cause the sorghum vegetables to not germinate or to die after germination. It is strictly forbidden to use sulfonylureas and imidazoline herbicides in the front of the vegetable field, and it is even more inappropriate to use simazine and oxacilon which will poison the soil. The leaf-leaf vegetables should try not to use the stems and leaves to treat the herbicides, and the root vegetables should try not to damage the roots of the soil to treat herbicides, such as amides and dinitroaniline herbicides. It is not advisable to use vegetable fields that have been used to kill rice fields.
3. The dosage form of the herbicide from the dosage form is powder, emulsifiable concentrate, granule, soluble powder, smoke agent, oil, suspending agent and tablet. All kinds of herbicides are added with additives. Such as solvents, wetting agents, emulsifiers, suspending agents or stabilizers, the introduction of these additives will increase the toxicity of herbicides, but also increase the possibility of phytotoxicity, vegetable should try to avoid the use of emulsifiable oil, oil , suspending agents, smoke agents and tablets.
4. Considering the degree of odor and pollution Protecting vegetables and greenhouse vegetables should avoid using herbicides with strong pungent odor. Some herbicides are polluted and polluted by containers. For example, the use of 2,4-D butyl ester within 2000 meters of vegetable ground and 500 meters of downwind may harm vegetables. Sprayers sprayed with 2,4-D butyl ester, even if cleaned, such as spraying other herbicides on vegetables, can damage vegetables. In addition, butachlor, trifluralin, chlorpyrifos, and granitic can not be used in vegetable fields.
How to choose herbicides for green vegetables
1. From the way of absorption, herbicides have a system of internal absorption and contact. A systemic herbicide is a spray that is absorbed into a leaf of a plant and can be transported to the flower, fruit or root after being absorbed by the plant root. Contact-type herbicides are sprayed onto a leaf of a plant that is not transmitted to other leaves and is not transmitted to the roots, flowers and fruit of the plant. Similarly, contact herbicides sprayed onto the surface of the soil are not transmitted to the leaves, stems, flowers and fruit by root absorption. Vegetable sites should try to use contact herbicides, such as Er, oxacillin, etc., or use herbicides with poor conductivity in systemic herbicides, such as herbicide.
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