Phosphorus availability for plant uptake in a phosphorus-enriched noncalcareous sandy soil

G.F. Koopmans, W.J. Chardon, P.A.I. Ehlert, J. Dolfing, R.A.A. Suurs, O. Oenema, W.H. van Riemsdijk

Research output: Contribution to journalArticleAcademicpeer-review

85 Citations (Scopus)

Abstract

Mining soil phosphorus (i.e., harvesting P taken up from the soil by a crop grown without external P addition) has been proposed as a possible management strategy for P-enriched soils to decrease the risk of P leaching. We performed a pot experiment in a greenhouse where grass was cropped on a P-enriched noncalcareous sandy soil at zero P application over a period of 978 d. We determined the long-term availability of soil P and evaluated the effectiveness of mining soil P to decrease P in different pools. There were two treatments: soil layers in the pots of either 5 or 10 cm thickness. Soils were analyzed at various stages of the experiment. Phosphorus in soil solution and the total pool of sorbed P were estimated using 1:10 (w/v) 0.01 M CaCl2 extracts and acid ammonium oxalate (Pox), respectively. A desorption isotherm was constructed, which described the relationship between P in soil solution and the total pool of sorbed P for the soils of the 5- and 10-cm treatments. The Langmuir equation gave a very good description of the isotherm. In the long-term, 65% of Pox in the initial soil can be removed by plant uptake, as was calculated from the Langmuir equation and a critical P concentration in soil solution at which P uptake can just be maintained. Thus, Pox may be largely plant available. From the strong nonlinearity of the desorption isotherm, it can be understood why the relative decrease of the P concentration in the CaCl2 extracts was much larger than the relative decrease of Pox. Mining soil P decreased the P concentration in soil solution effectively and, therefore, risk of P leaching from our P-enriched soil.
Original languageEnglish
Pages (from-to)965-975
JournalJournal of Environmental Quality
Volume33
Issue number3
DOIs
Publication statusPublished - 2004

Keywords

  • phosphate sorption
  • model
  • desorption
  • adsorption
  • iron
  • extraction
  • oxides
  • netherlands
  • saturation
  • simulation

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