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Chemical nature of residual phosphorus in Andisols

Abstract : Sequential fractionation has been widely used to study the nature and dynamics of soil P. Residual P - the recalcitrant P fraction remaining after sequential extraction with alkali and acid reagents - often constitutes the majority of the soil P, yet its nature and bioavailability is poorly understood. The objective of this study was to isolate, quantify, and characterize residual P following Hedley fractionation in a range of Andisols under grazed pasture by 31P nuclear magnetic resonance (NMR) spectroscopy. Residual P accounted for 45-63% of the total soil P, of which 53-77% was inorganic orthophosphate. Organic P accounted for 21-42% of the residual P, the majority of which occurred as phosphomonoesters including myo- (16% of the residual P) and scyllo-inositol hexaldsphosphate (10% of the residual P). No phosphodiesters were detected in the residual fraction. We conclude that residual P in Andisols consists of a mixture of inorganic P and organic P. Our findings provide the basis for the development of new approaches to improve P use efficiency in agriculture.
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Gabriela Velasquez, Phuong-Thi Ngo, Cornelia Rumpel, Marcela Calabi-Floody, Yonathan Redel, et al.. Chemical nature of residual phosphorus in Andisols. Geoderma, Elsevier, 2016, 271, pp.27-31. ⟨10.1016/j.geoderma.2016.01.027⟩. ⟨hal-02640310⟩



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