Lookup NU author(s): Dr Jan Dolfing
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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-Na(2)EDTA (ethylenediaminetetraacetic acid) and water extracts of acidic sandy soil samples from the top 5 cm of grassland with Wet chemical analysis and IT 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 P-31 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.
Author(s): Koopmans GF, Chardon WJ, Dolfing J, Oenema O, van der Meer P, van Riemsdijk WH
Publication type: Article
Publication status: Published
Journal: Journal of Environmental Quality
Print publication date: 01/01/2003
ISSN (print): 0047-2425
ISSN (electronic): 1537-2537
Notes: Times Cited: 13
Cited Reference Count: 44
J ENVIRON QUAL