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This article in SSSAJ

  1. Vol. 52 No. 5, p. 1407-1410
     
    Received: July 7, 1987
    Published: Sept, 1988


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doi:10.2136/sssaj1988.03615995005200050038x

Phosphorus Sorption of Subtropical Acid Soils as Influenced by the Nature of the Cation Suite

  1. J. S. Russell,
  2. C. S. Andrew and
  3. E. J. Kamprath 
  1. Div. of Tropical Crops and Pastures, CSIRO, St. Lucia, Queensland, Australia, 4067
    Dep. of Soil Science, North Carolina State Univ., Raleigh, NC 27695-7619

Abstract

Abstract

Previous field studies with pasture on subtropical acid soils in eastern Australia showed a long residual effect of relatively low rates of fertilizer P. Samples of six soils from eastern Australia were collected to determine their P sorption characteristics. Monocalcium phosphate solutions containing 0.005 M CaCl2 were equilibrated with samples which were untreated, limed or CaCl2-leached. Measurements were made of the amount of P sorbed and P remaining in solution. The soil chemical properties affecting P sorption, P buffering and amount of P sorbed needed to provide 0.2 µg P mL−1 were determined by multiple regression analysis. Phosphorus sorption and buffer capacity increased with increasing CuCl2-extractable Al and decreased with increasing exchangeable Na saturation or increased soil solution Na. Amounts of sorbed P needed for 0.2 µg P mL−1 in the soil solution were relatively small for the untreated and limed Natrustalfs and ranged from 13 to 37 mg P kg−1 soil. A given application of P fertilizer will provide a higher soil solution P in subtropical soils which contain appreciable Na, such as Natrustalfs, than those in which Ca is the dominant cation.

Joint contribution from Div. of Tropical Crops and Pastures, CSIRO and Dep. of Soil Science, North Carolina State Univ. Paper no. 11017 of the Journal Series of the North Carolina Agric. Res. Series.

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