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a Department of Statistics, University of Florida, Gainesville, FL 32611
b Earth and Environmental Science Department, The University of Texas, San Antonio, TX 78249-0663
c Agricultural and Biological Engineering Department, Pennsylvania State University, University Park, PA 16802
* Corresponding author (gao{at}ufl.edu).
Received for publication July 18, 2002. Efficient utilization of biosolids P for agronomic purposes requires accounting for differences in the phytoavailability of P in various biosolids. Greenhouse studies were conducted with a common pasture grass grown in two P-deficient soils amended with 12 biosolids and a commercial fertilizer (triple superphosphate, TSP) to quantify P uptake and to assess the relative phytoavailabilities of the P sources. Biosolids were grouped into three general categories of phytoavailability relative to TSP: high (>75% of TSP), moderate (25–75% of TSP), and low (<25% of TSP). Two biosolids, produced via biological phosphorus removal (BPR) processes, were in the high category, and mimicked fertilizer P with regard to P phytoavailability. Most biosolids produced by conventional wastewater and solids digestion and additional treatments like composting were in the moderate category. Also included in this category was a BPR that had been pelletized and another BPR supplemented with Al. The low category included biosolids containing greater than normal (>50 g kg–1) total Fe and Al concentrations and processed to high (>60%) solids content.
Abbreviations: BPR, biological phosphorus removal • TSP, triple superphosphate
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