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This article in SSSAJ

  1. Vol. 54 No. 5, p. 1261-1266
     
    Received: Oct 10, 1989


    * Corresponding author(s):
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doi:10.2136/sssaj1990.03615995005400050010x

Critical Evaluation of Methods for Determining Total Organic Phosphorus in Tropical Soils

  1. L. M. Condron,
  2. J. O. Moir,
  3. H. Tiessen  and
  4. J. W. B. Stewart
  1. Dep. of Soil Science, Lincoln Univ., Canterbury, New Zealand
    Dep. of Soil Science, Univ. of Saskatchewan, Saskatoon, Canada S7N 0W0

Abstract

Abstract

The determination of total organic phosphorus (TOP) in soils presents several methodological problems, particularly on strongly weathered and tropical soils. We reviewed the application of several methods for TOP determination to soils from different zones of the globe and evaluated the applicability of one ignition and two extraction methods to tropical soils from Brazil and Ghana. Reproducibility (coefficients of variation) was within 6% for the ignition method, and 13% for the extraction methods, due to the simplicity of the former. The two extraction methods produced results similar to each other, while the ignition method generally gave higher TOP contents. Unusually low C to organic P ratios indicate that the ignition method overestimated TOP in several soils. The Bowman extraction method, developed on weakly weathered soils, appeared also suitable for a variety of tropical soils.

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