Wet chemical and phosphorus-31 nuclear magnetic resonance analysis of phosphorus speciation in a sandy soil receiving long-term fertilizer or animal manure applications

G.F. Koopmans, W.J. Chardon, J. Dolfing, O. Oenema, P. van der Meer, W.H. van Riemsdijk

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Abstract

In areas under intensive livestock farming and with high application rates of animal manure, inorganic and organic phosphorus (P) may be leached from soils. Since the contribution of these P compounds to P leaching may differ, it is important to determine the speciation of P in these soils. We determined the effect of various fertilization regimes on the P speciation in NaOH–Na2EDTA (ethylenediaminetetraacetic acid) and water extracts of acidic sandy soil samples from the top 5 cm of grassland with wet chemical analysis and 31P nuclear magnetic resonance (NMR) spectroscopy. These soils had been treated for a period of 11 years with no fertilizer (control), N (no P application), N–P–K, or different animal manures. Inorganic P was highly elevated in the NaOH–Na2EDTA extracts of the soils amended with N–P–K or animal manures, while organic P increased only in the soil treated with pig slurry. Water-extractable P showed a similar trend. As indicated by 31P NMR, orthophosphate monoesters were the main organic P compounds in all soils. Our results suggest that long-term applications of large amounts of P fertilizer and animal manures caused an accumulation of inorganic P, resulting in an increase of the potential risk related to mobilization of inorganic P in the top 5 cm of these soils.
Original languageEnglish
Pages (from-to)287-295
JournalJournal of Environmental Quality
Volume32
DOIs
Publication statusPublished - 2003

Keywords

  • sandy soils
  • soil chemistry
  • leaching
  • phosphorus
  • soil analysis
  • chemical speciation
  • nuclear magnetic resonance spectroscopy
  • northern vancouver-island
  • organic phosphorus
  • p-31 nmr
  • podzolic soils
  • forms
  • spectroscopy
  • extraction
  • netherlands
  • chemistry
  • fractions

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