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Related Concept Videos

Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

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Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
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Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...
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Reducing human nitrogen use for food production.

Junguo Liu1, Kun Ma2, Philippe Ciais3

  • 1School of Environmental Science and Engineering, South University of Science and Technology of China, Shenzhen, 518055, China.

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Summary
This summary is machine-generated.

Global food production uses reactive nitrogen (N) inefficiently, with animal products contributing significantly to environmental losses. Future food demands may increase nitrogen input by 100 Tg N yr(-1), necessitating improved N management and recycling in agriculture.

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Area of Science:

  • Environmental Science
  • Agricultural Science
  • Biogeochemistry

Background:

  • Reactive nitrogen (N) is essential for food production but is largely lost to the environment.
  • Current global food production systems exhibit significant nitrogen (N) inefficiency.

Purpose of the Study:

  • To quantify total nitrogen (TN) input in global food production.
  • To project future nitrogen (N) requirements for food security.
  • To identify strategies for mitigating nitrogen (N) losses.

Main Methods:

  • Calculation of total nitrogen (TN) input for global food production in 2000.
  • Estimation of future TN requirements based on projected population growth and food demand.
  • Analysis of the impact of animal product consumption and agricultural practices on TN.

Main Results:

  • Global food production had a total nitrogen (TN) input of 171 Tg N yr(-1) in 2000.
  • Animal product production accounted for over 50% of TN input, disproportionate to calorie production (17%).
  • An additional 100 Tg N yr(-1) may be needed by 2030 to meet food security goals under a baseline scenario.

Conclusions:

  • Increased animal production is a major driver of rising nitrogen (N) inputs.
  • Improved nitrogen (N)-use efficiency, dietary shifts, and reduced food waste can mitigate nitrogen (N) increases.
  • Sustainable nitrogen (N) management and enhanced N-recycling are critical challenges for environmental protection and food security.