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- Title
Nitrogen Fertilization Effects on Grassland Soil Acidification: Consequences on Diffusive Phosphorus Ions.
- Authors
Stroia, Ciprian; Morel, Christian; Jouany, Claire
- Abstract
Soil acidification due to N supplied from fertilizer or aerial deposition in grasslands is well recognized and documented; however, little is known about its consequences on soil P availability. This question was addressed on a long-term field experiment done on grassland in Ercé (Central Pyrenees, France), where plots were treated for 6 yr with a factorial combination of mineral N added as NH4NO3 (0 and 190 kg ha-1 yr-1) and p (0 and 50kg ha-1 yr-1) and managed with a frequent defoliation regime (3 cuts yr-1). Diffusive PO4 ion dynamics at the soil-solution interface was determined by coupling sorption studies with 32P labeling of PO4 ions (Pi) and dilution analysis. Results showed that the soil pH did not change in zero-N treatments (5.9 ± 0.1) in comparison with the initial soil (5.9 ± 0.1), whereas it decreased to 5.3 ± 0.1 on N-treated soils. Meanwhile the cation exchange capacity and exchangeable Ca2+ and Mg2+ contents decreased significantly and the saturation percentage of the adsorption complex by Al3+ increased from 2 to 15; no changes were observed for untreated soils, Furthermore, the gross amount of diffusive Pi (Pr) was accurately described as a function of the concentration of PO4 ions in the solution (Cp) and time (t) by a Freundlich kinetic equation; these dynamics were significantly modified by N supply but not by P.
- Subjects
NITROGEN fertilizers; SOIL acidification; PHOSPHORUS; PROPERTIES of matter; ELECTROLYSIS; HYDROGEN-ion concentration
- Publication
Soil Science Society of America Journal, 2011, Vol 75, Issue 1, p112
- ISSN
0361-5995
- Publication type
Article
- DOI
10.2136/sssaj2009.0135