Abstract
The retention and transport of P by three horizon samples (A, E, and Bh) of a Spososol (Oldsmar sand: sandy, silicious, hyperthermic Alfic Arenic Haplaquods) were evaluated using a batch-equilibration and leaching column techniques with application of P in rates equivalent to 25 and 100 kg P ha-1. Adsorption coefficient (K) values followed the order: Bh > A > E. Adsorption of P by the E horizon soil sample was negligible (M = 4 μg g-1 soil) as compared to that of either A or Bh horizon samples, e.g., 303 and 479 μg g-1, respectively. The leaching column study with application of P equivalent to 100 kg ha-1 showed 39, 68, and 98% of applied P were leached from the Bh, A, and E horizons, respectively, with eight pore volumes of leachate. Elution curves showed the peak P elution at the second pore volume (equivalent to 3.7 cm of water addition). After leaching with eight pore volumes, the residual P in the soil was present primarily in non-occluded Fe and Al-P forms in the A and Bh horizons.
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Li, Y.C., Alva, A.K. & Calvert, D.V. Transport of Phosphorus and Fractionation of Residual Phosphorus in Various Horizons of a Spodosol. Water, Air, & Soil Pollution 109, 303–312 (1999). https://doi.org/10.1023/A:1005081313400
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DOI: https://doi.org/10.1023/A:1005081313400