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Related Concept Videos

Overview of Nitrogen Metabolism01:20

Overview of Nitrogen Metabolism

Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of  ammonia, ammonium ions, nitrate, nitrite, or  nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this nitrogen...
The Nitrogen Cycle01:49

The Nitrogen Cycle

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...
Microbes and the Nitrogen Cycle01:26

Microbes and the Nitrogen Cycle

The nitrogen cycle is a complex biogeochemical process critical to maintaining the balance of nitrogenous compounds in ecosystems. This cycle involves multiple microbial-mediated transformations through which nitrogen changes oxidation states, supporting essential ecological functions and contributing to plant and microbial growth.Nitrogen Fixation and AmmonificationNitrogen fixation initiates the cycle by converting inert atmospheric nitrogen (N₂) into bioavailable ammonia (NH₃), a process...
Environmental Applications of Microorganisms01:30

Environmental Applications of Microorganisms

Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

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 nitrate reductase...
Microorganisms in Agriculture and Food industry01:27

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Microorganisms play a crucial role in agriculture and the food industry, contributing to soil fertility, crop protection, and food production. Their functions range from nitrogen fixation and biopesticide production to fermentation and food preservation, making them indispensable to sustainable farming and food safety.Role in AgricultureNitrogen-fixing bacteria, such as Rhizobium (symbiotic) and Azotobacter (free-living), convert atmospheric nitrogen into ammonia through biological nitrogen...

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Related Experiment Video

Updated: May 30, 2026

Microplot Design and Plant and Soil Sample Preparation for 15Nitrogen Analysis
08:44

Microplot Design and Plant and Soil Sample Preparation for 15Nitrogen Analysis

Published on: May 10, 2020

Environmentally friendly slow-release nitrogen fertilizer.

Boli Ni1, Mingzhu Liu, Shaoyu Lü

  • 1State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province and Department of Chemistry, Lanzhou University, Lanzhou 730000, People's Republic of China.

Journal of Agricultural and Food Chemistry
|August 19, 2011
PubMed
Summary
This summary is machine-generated.

New slow-release nitrogen fertilizers using natural attapulgite clay and hydrogels reduce nutrient loss. This innovation enhances water use efficiency and extends irrigation cycles, crucial for sustainable agriculture.

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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O

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Last Updated: May 30, 2026

Microplot Design and Plant and Soil Sample Preparation for 15Nitrogen Analysis
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Published on: May 10, 2020

Calibrated Passive Sampling - Multi-plot Field Measurements of NH3 Emissions with a Combination of Dynamic Tube Method and Passive Samplers
10:29

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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
08:05

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O

Published on: October 7, 2020

Area of Science:

  • Materials Science
  • Agricultural Science
  • Environmental Science

Background:

  • Growing global population necessitates increased fertilizer use, posing environmental risks if not managed.
  • Conventional fertilizers often lead to nutrient loss and inefficient water utilization.

Purpose of the Study:

  • To develop and evaluate slow-release nitrogen fertilizer formulations.
  • To assess the impact of these formulations on soil properties and nutrient release.

Main Methods:

  • Formulation of slow-release fertilizers using attapulgite (APT) clay, ethylcellulose (EC) film, and CMC/HEC hydrogel.
  • Characterization of structural and chemical properties.
  • Determination of nitrogen release profiles (urea, ammonium sulfate, ammonium chloride) in soil.
  • Application of a mathematical model to calculate diffusion coefficients.
  • Evaluation of the product's effect on soil water-holding and retention capacities.

Main Results:

  • The developed formulations effectively reduced nutrient loss.
  • Improved water use efficiency was observed.
  • Prolonged irrigation cycles were achieved in simulated drought conditions.
  • Mathematical modeling provided insights into nutrient diffusion characteristics.

Conclusions:

  • The novel slow-release fertilizer formulations offer a sustainable solution for nitrogen delivery.
  • These formulations mitigate environmental hazards associated with conventional fertilizers.
  • The product enhances soil water management, benefiting agriculture in water-scarce regions.