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Phytoavailability of biosolids phosphorus.

G A O'Connor1, D Sarkar, S R Brinton

  • 1Soil and Water Science Department, University of Florida, Gainesville, FL 32611, USA. gao@ufl.edu

Journal of Environmental Quality
|April 13, 2004
PubMed
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Biosolids phosphorus (P) phytoavailability varies greatly. Two biological phosphorus removal (BPR) biosolids showed high P availability, while most others had moderate or low P availability in greenhouse trials.

Area of Science:

  • Environmental Science
  • Soil Science
  • Agronomy

Background:

  • Efficient phosphorus (P) utilization from biosolids is crucial for sustainable agriculture.
  • Phytoavailability of P in biosolids differs significantly based on production methods and composition.
  • Understanding these differences is key to optimizing biosolids as P fertilizers.

Purpose of the Study:

  • To quantify phosphorus uptake in pasture grass grown in P-deficient soils amended with various biosolids.
  • To assess and categorize the relative phytoavailability of phosphorus from different biosolids compared to triple superphosphate (TSP).

Main Methods:

  • Greenhouse studies using a common pasture grass in two P-deficient soils.
  • Amendment of soils with 12 different biosolids and triple superphosphate (TSP) as a control.

Related Experiment Videos

  • Measurement of plant P uptake to determine relative phytoavailability.

    • Main Results:

    • Biosolids were categorized into high (>75% of TSP), moderate (25-75% of TSP), and low (<25% of TSP) phytoavailability groups.
    • Two biological phosphorus removal (BPR) biosolids demonstrated high P phytoavailability, similar to TSP.
    • Most conventional biosolids and some treated BPRs fell into the moderate category.
    • Biosolids with high Fe/Al content and high solids (>60%) showed low P phytoavailability.

    Conclusions:

    • Biosolids P phytoavailability is highly variable, necessitating source-specific assessment for agronomic use.
    • Biological phosphorus removal (BPR) processes can yield biosolids with high P phytoavailability.
    • Factors like high Fe/Al content and high solids processing reduce biosolids P availability.