Abstract
Phosphorus (P) immobilization in soil involves geochemical (e.g., sorption, precipitation, and diffusion) and microbiological (microbial uptake) processes. Using a Brazilian Ultisol, relative contributions of both processes to the total immobilization of applied P over 14 days were investigated. The P immobilized by microbes as interpreted by microbial suppression (achieved by mercury sterilization) was 17, 50, 54, and 56% (of the total immobilized P) on days 3, 7, 10, and 14 after fertilization, respectively. In the short-term (1 to 3 days), microbes played less of a role than did the physical effect of shaking the soil, but became the major factor by days 7 to 14. Geochemical process that might be considered short-term ageing caused only 13–16% of the total immobilization in the same time period above. Calculations supported the interpretation that measurable diffusion occurred across water films on the soil particles.
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Acknowledgement
The financial support was provided by a graduate assistantship in the Soil and Water Science Department at University of Florida and the Researcher Support Scholarship Program of the Soka Alumni Association in Soka University, Japan. Special thanks go to Dr. Paulo Gabriel Nacif of the Federal University of Bahia, Brazil for providing the soil samples, and Mary McLeod and Miranda Lucas for technical assistance.
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Sato, S., Comerford, N.B. The non-recoverable phosphorus following sorption onto a Brazilian Ultisol. Biol Fertil Soils 44, 649–652 (2008). https://doi.org/10.1007/s00374-007-0255-1
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DOI: https://doi.org/10.1007/s00374-007-0255-1