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This article in SSSAJ

  1. Vol. 61 No. 1, p. 315-321
     
    Received: Dec 19, 1995
    Published: Jan, 1997


    * Corresponding author(s): mi456@mluri.sari.ac.uk
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doi:10.2136/sssaj1997.03615995006100010045x

Effect of Storage and Sieving on the Phosphorus Composition of Soil Solution

  1. P.J. Chapman ,
  2. C. A. Shand,
  3. A. C. Edwards and
  4. S. Smith
  1. Plants Division, Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen, AB15 8QH, UK

Abstract

Abstract

In this study, the effects of storage and sieving of a mineral soil (Typic Fragiorthod) on the P chemistry of the soil solution have been quantified. Intact and sieved soil cores were stored for 0, 1, 3, and 8 d at 4°C prior to obtaining solutions, which were analyzed for total dissolved phosphorus (TDP), molybdate-reactive phosphorus (MRP), dissolved organic phosphorus (DOP), and dissolved condensed phosphorus (DCP). Storage of both sieved and intact soil cores influenced the amount and chemical composition of P in solution. Concentrations of TDP, MRP, and DOP displayed a rapid decline with increase in storage time, whereas DCP concentrations, which were initially very low, increased. Concentrations of TDP were significantly (P < 0.05) different between solutions extracted from intact and sieved soils on the same day as sampling and this was accounted for by DOP and MRP, which were significantly (P < 0.05) larger in sieved soil. The proportions of MRP, DOP, and DCP were similar in solutions extracted from intact and sieved soils on the same day, even for Day 0 where a large difference in TDP was apparent. The MRP fraction was consistently larger for intact cores (44%) than sieved (38%) on all days and varied little with length of storage. The DOP component, which dominated initially, decreased with increase in storage time, while DCP increased to become the major fraction after 8 d of storage. This study has highlighted the potential effects of soil storage and sieving on the P concentration and composition of soil solution. The results also have important implications for soil solution sampling and subsequent data interpretation.

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