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Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment
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Nano and micro manure amendments decrease degree of phosphorus saturation and colloidal phosphorus release from

Sangar Khan1, Chunlong Liu2, Paul J Milham3

  • 1Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resources Sciences, Zhejiang University, Hangzhou 310058, China.

The Science of the Total Environment
|July 14, 2022
PubMed
Summary
This summary is machine-generated.

Reducing phosphorus (P) release from manure-amended soils is crucial for water quality. This study found that using micro- and nano-manures significantly decreases colloidal P release compared to bulk manures, offering an effective strategy for environmental protection.

Keywords:
Agricultural soilColloidal phosphorusManureNanoPhosphorus saturation

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Area of Science:

  • Soil Science
  • Environmental Chemistry
  • Agricultural Science

Background:

  • Manure fertilizers increase soil phosphorus (P) saturation and colloidal P release into water bodies.
  • Limited knowledge exists on how different manure particle sizes affect colloidal P release.

Purpose of the Study:

  • To investigate the impact of sheep and poultry micro- and nano-manures on colloidal P release from amended soils.
  • To determine if manure particle size influences P saturation and colloidal P release.

Main Methods:

  • Sheep and poultry micro- and nano-manures were produced using wet fractionation.
  • The P content, ash, and mineral composition of manures were analyzed.
  • The degree of P saturation (DPS) and colloidal P release were measured in Anthorsol and Cambisol soils amended with different manure sizes.

Main Results:

  • Fractionation reduced P content and increased ash and phosphate minerals in micro- and nano-manures.
  • Soils amended with micro- and nano-manures showed decreased DPS and lower colloidal P release compared to bulk manures.
  • The reduction in colloidal P release was directly correlated with decreased DPS.

Conclusions:

  • Manure particle size, specifically micro- and nano-fractions, effectively reduces colloidal P release from amended soils.
  • Chemical fractionation during particle size separation is the primary mechanism for reduced P release.
  • Micro- and nano-manures are suggested as effective approaches to mitigate colloidal P release from manure-amended soils.