| 摘要 |
A contact bar of permeable, absorbant, exudative material such as a paint roller is attached by a spring bar to a mounting bracket. The contact bar is moistened with a treatment liquid such as a herbicide. Each time the contact bar rubs against a plant, additional herbicide is applied to the contact bar, e.g., a spring arm, carrying the contact bar, can be pushed back by the plant against a microswitch, which will open a solenoid valve. The opening of the solenoid valve may apply liquid to the contact bar by spraying the liquid from a nozzle onto the bar or by feeding liquid through a perforated tube under the surface of the material on the contact bar.
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