A31P-NMR spectroscopic study of phosphorus forms in two phosphorus-fertilized grassland soils in eastern Canada

Phosphorus (P) fertilization can increase grassland production, but will also alter P forms, changing their cycling and potential for loss in runoff. We assessed the effects of mineral P fertilization on soil P forms in timothy swards at two sites in Quebec, Canada. Soil samples (10 cm depth) were c...

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Bibliographic Details
Published in:Canadian Journal of Soil Science 2019-02, Vol.99 (2), p.161-172
Main Authors: Abdi, Dalel, Cade-Menun, Barbara J, Ziadi, Noura, Shi, Yichao, Bélanger, Gilles, Lajeunesse, Julie, Lafond, Jean
Format: Article
Language:English
Subjects:
31P-NMR P forms
31P-RMN formes de P
Acetic acid
Aluminum
Calcium
Clay
Clay loam
Clay minerals
Diesters
Edetic acid
engrais P
Ethylenediaminetetraacetic acids
Fertilization
fléole
Glucose
grassland
Grasslands
Hydroxyapatite
Inositol
Iron
Isotopes
Leaching
Loam
Magnetic resonance spectroscopy
NMR
Nuclear magnetic resonance
Organic phosphorus
Orthophosphate
P fertilization
pH effects
Phosphates
Phosphorus
pâturages
Runoff
Sodium
Sodium hydroxide
Soil fertility
Soils
timothy
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Summary:Phosphorus (P) fertilization can increase grassland production, but will also alter P forms, changing their cycling and potential for loss in runoff. We assessed the effects of mineral P fertilization on soil P forms in timothy swards at two sites in Quebec, Canada. Soil samples (10 cm depth) were collected in autumn 2013 from replicate plots at Lévis on a Kamouraska clay and at Normandin on a Labarre clay loam, each having received three rates of triple superphosphate (0, 20, and 40 kg P ha-1) for 4 yr. These were analyzed for pH, total carbon (TC), total nitrogen (TN), and total phosphorus (TP); Mehlich-3-extractable aluminium (AlM3), iron (FeM3), calcium (CaM3), and P (PM3); and 31P nuclear magnetic resonance spectroscopy (31P-NMR) following sodium hydroxide–ethylenediaminetetraacetic acid (NaOH–EDTA) extraction. Phosphorus fertilization had no significant effects on soil TC, TN, AlM3, FeM3, CaM3, and pH, but significantly increased TP, NaOH–EDTA-extractable total P and total inorganic P, PM3, orthophosphate, and glucose 6-phosphate at both sites. In contrast, NaOH–EDTA-extractable total organic P, total orthophosphate diesters, and scyllo-inositol hexaphosphate decreased with P fertilization. Phosphorus fertilization over 4 yr increased soluble inorganic P and decreased organic P at both grassland sites.
ISSN:0008-4271
1918-1841
1918-1833
DOI:10.1139/cjss-2018-0125