nitrogen fixation

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nitrogen fixation

A farmer plants legumes in a field to improve soil nitrogen fixation.

Definition

Noun: - The biological or industrial process of converting atmospheric nitrogen (N₂) into ammonia (NH₃) or related nitrogenous compounds: This process makes inert atmospheric nitrogen accessible to living organisms, as most cannot use nitrogen gas directly. It is a crucial step in the nitrogen cycle.

Usage
  • The term describes a key natural and synthetic process. It is used in scientific contexts like biology, agriculture, and environmental science.
  • It typically functions as a subject or object in a sentence.
  • Example: "Nitrogen fixation is essential for plant growth."
  • Example: "Legumes, through their root nodules, perform biological nitrogen fixation."
Examples
  • Noun:
    • Biological nitrogen fixation enriches the soil without chemical fertilizers.
    • The invention of the Haber-Bosch process enabled industrial nitrogen fixation on a massive scale.
    • Scientists study the bacteria responsible for nitrogen fixation.
Advanced Usage
  • "Biological nitrogen fixation": The conversion of nitrogen gas to ammonia by microorganisms, often symbiotic bacteria in legume root nodules or free-living soil bacteria.
    • Biological nitrogen fixation provides a sustainable source of soil nitrogen.
  • "Industrial nitrogen fixation": The human-made chemical process, primarily the Haber-Bosch process, to produce ammonia from nitrogen and hydrogen gases.
    • Industrial nitrogen fixation is energy-intensive but critical for fertilizer production.
Variants and Related Words
  • Nitrogen-fixing (adj): Describing organisms or processes that carry out nitrogen fixation.
    • Rhizobium is a nitrogen-fixing bacterium.
  • Fix nitrogen (verb phrase): To perform the act of nitrogen fixation.
    • Certain bacteria can fix nitrogen from the air.
Synonyms
  • Nitrogen assimilation (in specific biological contexts, though this can be a broader term).
  • Dinitrogen fixation (a more technical synonym emphasizing the molecular form N₂).
Related Phrases and Concepts
  • Nitrogen cycle: The broader biogeochemical cycle in which nitrogen fixation is a key step.
  • Root nodules: Structures on legume plants that house nitrogen-fixing bacteria.
  • Ammonia synthesis: The industrial outcome of nitrogen fixation.
nitrogen fixation

A farmer plants legumes in a field to improve soil nitrogen fixation.

Noun
  1. the assimilation of atmospheric nitrogen by soil bacteria and its release for plant use on the death of the bacteria