102438 Soil Phosphorus Forms and Contents As Determined By 31P-NMR after 28 Years of Different Mineral P Fertilization Under Continuous Corn Production.

Poster Number 182-332

See more from this Division: SSSA Division: Soils and Environmental Quality
See more from this Session: Fertilizer and Water Management Effects on the Soil Environment Poster (includes student competition)

Monday, November 7, 2016
Phoenix Convention Center North, Exhibit Hall CDE

Noura N. Ziadi, Quebec Research and Development Centre, Agriculture & Agri-Food Canada, Quebec City, QC, CANADA, Barbara Cade-Menun, SPARC, 3Agriculture and Agri-Food Canada, , , t, SK S9H 3X2 Canada, Swift current, SK, Canada, Dalel Abdi, Agriculture & Agri-Food Canada, Quebec, QC, Canada and Christian Morel, TCEM (INRA-ENITAB), INRA, Villenave d’Ornon, France
Abstract:
Soil phosphorus forms and contents as determined by 31P-NMR after 28 years of different mineral P fertilization under continuous corn production Abdi, D.a, Cade-Menun, B. J.b, Ziadi, Na., and Morel, C.c,d aAgriculture and Agri-Food Canada, Québec, QC, Canada; bAgriculture and Agri-Food Canada, Swift Current, SK, Canada; cINRA, Villenave d’Ornon, France; dBordeaux Sciences Agro, Gradignan, France. Phosphorus (P) fertilization is required to sustain P availability to plants and productivity. The quantitative roles of soil inorganic and organic P forms are still unclear. The reference technique to characterize soil P forms is 31P nuclear magnetic resonance (31P-NMR) spectroscopy. Our objective was to assess the effects of long-term (28 yr) mineral P fertilization on soil P forms as determined by 31P-NMR. The study was carried out on a long term-term experimental site (1972-2000) located on an acidic, sandy soil in south-west France. Three P rates of triple superphosphate (averaging 0, 44, and 96 kg P ha-1 yr-1) were applied to continuous cultivated corn (Zea mays L.) since 1972, with four replicate plots. Soil samples were collected in spring 2000 at the 0-25 cm profile, analysed for phosphate ions concentration in soil solution (Cp), total P (TP) and total organic P (TOP) contents, and extracted in NaOH-EDTA solution before 31P-NMR spectroscopy. Results indicate that both TP and Cp greatly varied. The Cp ranged from 2.60 (±0.26) mg L-1 for 96 kg P ha-1 yr-1 to 0.44 (±0.13) mg L-1 without applying P, and varied strictly proportionally to cumulative difference between applied P and exported P in corn grains (y= 0.95×10-3x + 1.11, r²=0.96, 12 observations). In contrast, TOP did not vary significantly between P treatments. Indeed, the mean of soil TOP content was 112 (±18) mg P kg-1, which represented 39% of TP in the 0 kg P ha-1 yr-1 treatment, and only 19% of TP with the addition of 96 kg P ha-1 yr-1. The most abundant P forms were orthophosphate, myo-IHP and scyllo-IHP. Other results will be presented and discussed.

See more from this Division: SSSA Division: Soils and Environmental Quality
See more from this Session: Fertilizer and Water Management Effects on the Soil Environment Poster (includes student competition)

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