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• W4294023201 endingPage "136288" @default.
• W4294023201 startingPage "136288" @default.
• W4294023201 abstract "Legacy phosphorus (P) soils have received excessive P inputs from historic manure and fertilizer applications and present unique management challenges for protecting water quality as soil P saturation leads to increased soluble P to waterways. We used P K-edge X-ray absorption near edge structure (XANES) spectroscopy to identify and quantify the dominant P minerals in four representative legacy P soils under conventional till and no-till management in Maryland, USA. Various measures of extractable soil P, including water-extractable P (20.6–54.1 mg kg−1 at 1:10 soil-to-water ratio; 52.7–132.2 mg kg−1 at 1:100 soil-to-water ratio), plant available P extracted with Mehlich 3 (692–1139 mg kg−1), and Mehlich 3P saturation ratio (0.54–1.37), were above the environmental threshold values, suggesting the accumulation of legacy P in soils. The quantification of dominant P minerals may provide insights into the potential of legacy P soils to contribute to P release for crop use and soluble P losses. Linear combination fits of XANES spectra identified the presence of four phosphate mineral groups, consisting of (i) calcium-phosphate minerals (11–59%) in the form of fluorapatite, β-tricalcium phosphate, and brushite, followed by (ii) iron-phosphate minerals (12–49%) in the form of ludlamite, heterosite, P sorbed to ferrihydrite, and amorphous iron phosphates, (iii) aluminum-phosphate minerals (15–33%) in the form of wavellite and P sorbed to aluminum hydroxide, and (iv) other phosphate minerals (5–35%) in the form of copper-phosphate (cornetite, 5–18%) and manganese-phosphate (hureaulite, 25–35%). Organic P consisting of phytic acid was found in most soils (13–24%) and was more pronounced in the surface layer of no-till (21–24%) than in tilled (16%) fields. Of the P forms identified with XANES, we conclude that P sorbed to Fe and Al, and Ca–P in the form of brushite and β-tricalcium phosphate will likely readily contribute to the soil WEP pool as the soil solution P is depleted by crop uptake and lost via runoff and leaching." @default.
• W4294023201 created "2022-09-01" @default.
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• W4294023201 date "2022-12-01" @default.
• W4294023201 modified "2023-10-16" @default.
• W4294023201 title "X-ray absorption near edge structure spectroscopy reveals phosphate minerals at surface and agronomic sampling depths in agricultural Ultisols saturated with legacy phosphorus" @default.
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• W4294023201 doi "https://doi.org/10.1016/j.chemosphere.2022.136288" @default.
• W4294023201 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36058369" @default.
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