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Like all living organisms, plants require organic and inorganic nutrients to survive, reproduce, grow and maintain homeostasis. To identify nutrients that are essential for plant functioning, researchers have leveraged a technique called hydroponics. In hydroponic culture systems, plants are grown—without soil—in water-based solutions containing nutrients. At least 17 nutrients have been identified as essential elements required by plants. Plants acquire these elements from the...
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Updated: Oct 2, 2025

Microplot Design and Plant and Soil Sample Preparation for 15Nitrogen Analysis
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[Research progress on soil soluble organic nitrogen].

Zhi Quan1, Xuan-Ang Liu2, Dong Liu3

  • 1Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China.

Ying Yong Sheng Tai Xue Bao = the Journal of Applied Ecology
|February 28, 2022
PubMed
Summary
This summary is machine-generated.

Soluble organic nitrogen (SON) is vital for terrestrial ecosystems, influencing nutrient cycling. Distinguishing between labile and recalcitrant SON is key to understanding its role in nitrogen turnover and loss.

Keywords:
leachingmigrationmineralizationsoluble organic Ntransformation

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Area of Science:

  • Soil Science
  • Ecology
  • Environmental Science
  • Hydrology

Background:

  • Soluble organic nitrogen (SON) and inorganic nitrogen (N) are critical forms of nitrogen in terrestrial ecosystems.
  • SON influences nitrogen cycling processes like mineralization, retention, leaching, and plant absorption, making it a key research focus.

Purpose of the Study:

  • To review research progress on soil SON, covering its definition, quantification, composition, plant/microbial utilization, sources, influencing factors, and transformation/migration/leaching.
  • To highlight the complexity of SON, emphasizing the need to differentiate between labile and recalcitrant components for accurate assessment of its role in nitrogen cycling.

Main Methods:

  • Literature review of research on soil soluble organic nitrogen.
  • Analysis of existing studies on SON definition, quantification, composition, absorption, sources, and transformation.

Main Results:

  • Soil SON is a complex mixture, predominantly recalcitrant with a smaller labile fraction.
  • The quantity of SON alone does not fully represent its role in nitrogen cycling due to differing turnover rates of its components.
  • Labile SON is crucial for N conversion and absorption, while recalcitrant SON is important for N leaching and runoff.

Conclusions:

  • Accurate assessment of SON's role in nitrogen turnover, uptake, and leaching requires distinguishing between recalcitrant and labile components.
  • Future research should focus on labile SON for N conversion/absorption studies and recalcitrant SON for N loss studies.