defoliant

/di'foulieit/

Thân thiện

A farmer sprays defoliant on a cotton field before harvest.

Definition

Noun: A chemical substance, typically sprayed or dispersed, that causes the leaves of plants to fall off. Defoliants are often used in agriculture to facilitate harvesting or in warfare to remove forest cover.

Usage

Defoliants are used as a tool for vegetation management. The term is most frequently used in agricultural, military, and environmental contexts. - In agriculture, defoliants are applied to crops like cotton to remove leaves before mechanical harvesting. - In military history, certain chemical defoliants were used to destroy forest cover and crops. - The word is a countable noun (e.g., a defoliant, several defoliants).

Examples

• The farmers applied a defoliant to the cotton fields to prepare for the harvest.
• Agent Orange is a notorious defoliant used during the Vietnam War.
• The use of that chemical defoliant was banned due to its environmental and health impacts.

Advanced Usage

• "To be sprayed with defoliant": Describes the method of application for the chemical.
  • The forest was sprayed with defoliant, leaving the trees bare.
• "Defoliant use/policy": Refers to the practice or regulations surrounding these chemicals.
  • The government reviewed its defoliant use policy after the ecological report.

Variants and Related Words

• Defoliate (verb): To remove leaves from a plant, tree, or area of foliage.
  • The storm defoliated the trees.
• Defoliation (noun): The process or result of causing leaves to fall off.
  • The widespread defoliation was caused by the chemical agent.

Synonyms

• Herbicide (Note: A broader term for substances used to kill plants; all defoliants are herbicides, but not all herbicides are defoliants, as some kill the entire plant.)
• Desiccant (Specifically dries out plants; related but not identical in primary action.)

Related Phrases/Compounds

• Chemical defoliant: Emphasizes the substance's nature.
  • The report identified the compound as a potent chemical defoliant.

Học thuật

Noun

1. a chemical that is sprayed on plants and causes their leaves to fall off