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Soil Chemistry

Storage-Induced Changes in Phosphorus Solubility of Air-Dried Soils

Smithsonian Tropical Research Institute, Box 2072, Balboa, Ancon, Republic of Panama

^* Corresponding author (turnerbl{at}si.edu)

Soil is commonly stored in an air-dried state for extended periods before chemical analysis. The effect of storage on P solubility was assessed by determining NaHCO₃–extractable P concentrations in a range of pasture soils from England and Wales (total C = 28.9–80.4 g kg^–1, clay = 219–681 g kg^–1, pH = 4.4–6.8) immediately following air drying and after 3 yr of storage at ambient laboratory temperature. Following storage, NaHCO₃–extractable inorganic P concentrations decreased by between 2 and 60% (mean decrease = 21%), while NaHCO₃–extractable organic P concentrations increased by between 48 and 156% (mean increase = 95%). The greatest changes occurred in soils of pH < 5.3. The changes appear to result from the disruption of organic matter coatings on mineral surfaces, continuous solid-phase diffusion of phosphate into soil particles, and decomposition of microbial cells. The results have important implications for the determination of NaHCO₃–extractable P in stored soils and highlight the importance of working with fresh samples to derive information with relevance to field conditions.

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