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Applied and Environmental Soil Science
Volume 2013 (2013), Article ID 981715, 8 pages
Research Article

Temperature Effects on Phosphorus Release from a Biosolids-Amended Soil

1Range Cattle Research and Education Center, University of Florida, 3401 Experiment Station, Ona, FL 33865, USA
2Soil and Water Science Department, University of Florida, 2181 McCarty Hall, Gainesville, FL 32611, USA

Received 10 July 2013; Revised 23 August 2013; Accepted 23 August 2013

Academic Editor: Leonid Perelomov

Copyright © 2013 Maria L. Silveira and George A. O'Connor. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This study was designed to evaluate the effects of temperature on the potential leachable P pool and distribution of chemical P forms in a biosolids-amended soil. A P-deficient Spodosol was incubated with seven biosolids and inorganic P fertilizer at 20 and 32°C for 90 days. Amendments were applied to provide a total P concentration of 112 mg kg−1 soil, which correspond to a field application of ~224 kg P ha−1. Cumulative P mass leached during the 90 d study for any P source was <2% of the applied P, but greater cumulative P mass was released from the biological P removal and composted biosolids than from the heat-dried materials. Increasing temperature (20 to 32°C) generally decreased cumulative P mass leached, suggesting greater soil affinity to retain P at 32°C than at 20°C. In a static incubation experiment (no leaching), soil water-extractable P concentrations were reduced over time, but no temperature effect was observed. Similarly, P distribution among the various fractions was not affected by temperature. The relatively great ability of the soil to sorb P masked differences in biosolids properties and the potential impacts of temperature on P lability. Additional work using low P-sorbing soils is warranted.