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Related Experiment Videos

Phosphorus leaching from biosolids-amended sandy soils.

H A Elliott1, G A O'Connor, S Brinton

  • 1Agric. and Biol. Eng. Dep., Pennsylvania State Univ., University Park 16802, USA. hae1@psu.edu

Journal of Environmental Quality
|April 5, 2002
PubMed
Summary

Phosphorus (P) leaching from biosolids and manures in soils was studied. Biosolids generally showed low P leaching, unlike commercial fertilizer, especially on low P-sorbing soils. The phosphorus saturation index (PSI) helps predict P leaching potential.

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Area of Science:

  • Soil Science
  • Environmental Chemistry
  • Agronomy

Background:

  • Nutrient management increasingly focuses on phosphorus (P).
  • Understanding P behavior in soils amended with biosolids and manures is crucial.
  • Biosolids and manures are utilized as soil amendments, impacting P dynamics.

Purpose of the Study:

  • To characterize P forms and leachability in soils amended with biosolids, chicken manure (CM), and triple superphosphate (TSP).
  • To evaluate P leaching potential under different application rates and soil P-sorbing capacities.
  • To assess the utility of the phosphorus saturation index (PSI) in predicting P leaching from biosolids.

Main Methods:

  • Laboratory and greenhouse column studies using eight biosolids products, CM, and TSP.

Related Experiment Videos

  • Bahiagrass cultivation on two acid, P-deficient Florida sands (Candler and Immokalee series).
  • Application of amendments at 56 and 224 kg P(T) ha(-1) and leachate analysis for P concentration.

    • Main Results:

    • Leachate P was predominantly inorganic and lower for biosolids than TSP.
    • TSP and CM showed higher P leaching than most biosolids, particularly on low P-sorbing Immokalee soil.
    • Largo biosolids exhibited higher leachate P; PSI correlated with leaching, with PSI ≤ 1.1 indicating minimal leaching.

    Conclusions:

    • Biosolids generally pose a lower P leaching risk compared to TSP and CM in these soils.
    • The PSI is a valuable tool for identifying biosolids with low P leaching potential, especially for low P-sorbing soils.
    • Careful selection of biosolids, guided by PSI, can minimize P enrichment of drainage waters.