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Related Experiment Videos

Relationships between biosolids treatment process and soil phosphorus availability.

R O Maguire1, J T Sims, S K Dentel

  • 1Dep Plant and Soil Science, Univ of Delaware, Newark 19717-1303, USA. rmaguire@udel.edu

Journal of Environmental Quality
|June 13, 2001
PubMed
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Biosolids treatment affects phosphorus (P) availability in soils. Testing P availability in biosolids, not total P, better predicts soil P levels after amendment, crucial for nutrient management plans.

Area of Science:

  • Environmental Science
  • Soil Science
  • Agronomy

Background:

  • Phosphorus (P)-based nutrient management plans are mandated in several U.S. Mid-Atlantic states.
  • Biosolids are commonly applied to agricultural land, necessitating an understanding of their P behavior.
  • The study addresses the need to predict P behavior in soils amended with biosolids from various treatment processes.

Purpose of the Study:

  • To evaluate the relationship between biosolids treatment processes, P tests, and P behavior in amended soils.
  • To compare P extractability in two different soil types after amendment with biosolids and poultry litter.
  • To determine the efficacy of different biosolids P tests in predicting soil-extractable P.

Main Methods:

  • Incubation of two soil types (Elkton silt loam and Suffolk sandy loam) with eight different biosolids and poultry litter for 51 days.

Related Experiment Videos

  • Analysis of amended soils for water-soluble phosphorus (WSP), iron-oxide strip--extractable phosphorus (FeO-P), Mehlich-1 P, and pH at 1 and 51 days.
  • Analysis of biosolids and poultry litter for P, Fe, and Al using various digestion and extraction methods (USEPA 3050, oxalate, Mehlich-1, Mehlich-3).

    • Main Results:

    • Biosolids and poultry litter amendments increased extractable P in Suffolk sandy loam more than in Elkton silt loam.
    • Extractable P trends followed a pattern based on biosolids treatment: no Fe/Al addition > Fe/Al/lime addition > only Fe/Al salts.
    • Mehlich-3 P and P:[Al+Fe] molar ratios in biosolids predicted soil P changes for biosolids but not for poultry litter.

    Conclusions:

    • Biosolids treatment significantly influences phosphorus availability and behavior in amended soils.
    • Testing biosolids for P availability, rather than total P content, is a more reliable method for predicting soil P levels.
    • These findings support the development of more accurate nutrient management strategies for biosolids application.