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This article in JEQ

  1. Vol. 28 No. 6, p. 1804-1810
     
    Received: June 22, 1998
    Published: Nov, 1999


    * Corresponding author(s): aalva@tricity.wsu.edu
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doi:10.2134/jeq1999.00472425002800060016x

Sorption-Desorption and Solution Concentration of Phosphorus in a Fertilized Sandy Soil

  1. Z. L. He,
  2. A. K. Alva *,
  3. Y. C. Li,
  4. D. V. Calvert and
  5. D. J. Banks
  1. Univ. of Florida, Inst. of Food and Agric. Sciences, Indian River Res. and Education Center, Fort Pierce, FL 34945-3138;
    Univ. of Florida, Inst. of Food and Agric. Sciences, Citrus Res. and Education Center, Lake Alfred, FL 33850-2299;
    Univ. of Florida, Inst. of Food and Agric. Sciences, Tropical Res. and Education Center, Homestead, FL 33031-3314.

Abstract

Abstract

There has been increasing concern about drinking water contamination and accelerated eutrophication of surface water bodies. A field experiment was conducted to assess leaching potential of PO4-P in a Riviera fine sand (loamy, siliceous, hyperthermic Arenic Glossaqualf) under grapefruit (Citrus paradisi Macfad.) production that received 0 to 30 kg P ha−1 yr−1. The PO4-P concentration was measured in soil solution sampled using suction lysimeters installed above (120 cm) and below (180 cm) the hardpan (argillic horizon). Phosphorus sorption-desorption in soil samples from different depths of the soil profile was determined to understand the transport and leaching of P in the sandy soil. Phosphorus sorption capacity of the argillic horizon was much greater than the soil above and below it. The PO4-P concentrations in soil solution varied from 0.031 to 0.976 and from 0.002 to 0.083 mg P L−1 at the 120- and 180-cm depths, respectively. Solution PO4-P concentrations generally increased with P application rates. The concentrations of P in solution at the 120-cm depth were much greater than those at the 180-cm depths, due to the greater P retention capacity of and restricted flow of P through the hardpan. This study demonstrates that leaching of P into groundwater was reduced by the presence of a hardpan in the Riviera fine sand. However, the water drained from the soil above the hardpan contains phosphorus and could be a potential P source to surface waters.

Florida Agric. Exp. Stn. Journal Ser. No. R-06382.

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