Definition

Noun The continuous, natural process by which nitrogen, an essential element for life, circulates between the atmosphere, soil, water, and living organisms. This cycle involves the conversion of nitrogen from one chemical form to another, making it usable for plants and animals.

Usage

The term "nitrogen cycle" is used to describe the entire biogeochemical pathway of nitrogen. It is a standard concept in ecology, biology, and environmental science. * Understanding the nitrogen cycle is crucial for sustainable agriculture. * The lecture explained how human activity can disrupt the nitrogen cycle. * A key stage in the nitrogen cycle is nitrogen fixation by bacteria.

Examples

• Noun:
  • Fertilizers add nitrogen to the soil, but excessive use can imbalance the natural nitrogen cycle.
  • The diagram in the textbook illustrates the major steps of the nitrogen cycle.
  • Decomposers play a vital role in the nitrogen cycle by breaking down dead matter.

Advanced Usage

• "to complete/describe/disrupt the nitrogen cycle": These verbs are commonly used with the term to discuss its function, explanation, or alteration.
  • Certain bacteria are necessary to complete the nitrogen cycle.
  • Industrial processes significantly disrupt the global nitrogen cycle.

Variants and Related Words

• Nitrogen fixation (n): The process by which atmospheric nitrogen is converted into ammonia or related compounds, primarily by bacteria. This is a critical first step in the nitrogen cycle.
• Denitrification (n): The microbial process in the nitrogen cycle where nitrates are converted back into atmospheric nitrogen gas.
• Nitrogenous (adj): Containing nitrogen (e.g., ).

Synonyms

• Nitrogen circulation: A less common, more descriptive synonym.
• N-cycle: An informal abbreviation used primarily in scientific contexts.

Related Phrases

• Part of the nitrogen cycle: Used to describe a specific process within the larger cycle.
  • Ammonification is part of the nitrogen cycle where organic nitrogen is converted to ammonium.
• Cycle of nitrogen: An alternative phrasing with identical meaning, though "nitrogen cycle" is the standard term.

Noun

1. the circulation of nitrogen; nitrates from the soil are absorbed by plants which are eaten by animals that die and decay returning the nitrogen back to the soil