Assessment of phosphorus status influenced by Al and Fe compounds in volcanic grassland soils

Volcanic ash derived soils represent between 50-60% of the total arable land area of southern of Chile, and they are the most important soils for pasture production. In these soils, high phosphorus (P) fixation and, in turn, low P availability and high aluminium (Al) soluble concentrations (at low p...

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Autores principales:	Redel,Y, Cartes,P, Demanet,R, Velásquez,G, Poblete-Grant,P, Bol,R, Mora,M. L
Lenguaje:	English
Publicado:	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo 2016
Materias:	Aluminum phosphorus availability iron andisol
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162016000200016
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spelling	oai:scielo:S0718-951620160002000162016-10-24Assessment of phosphorus status influenced by Al and Fe compounds in volcanic grassland soilsRedel,YCartes,PDemanet,RVelásquez,GPoblete-Grant,PBol,RMora,M. L Aluminum phosphorus availability iron andisol Volcanic ash derived soils represent between 50-60% of the total arable land area of southern of Chile, and they are the most important soils for pasture production. In these soils, high phosphorus (P) fixation and, in turn, low P availability and high aluminium (Al) soluble concentrations (at low pH) are the most limiting factors for pasture production. At the same time, the complexes between Al-or iron- (Fe) and organic matter as well as short-range order alumino-silicates (allophane) allow the retention of huge quantities of soil P. The aim of this work was to assess the status of P by both sequential extraction procedure (Hedley) and 31P-NMR analysis as influenced by Al and Fe in volcanic grasslands Andisols (Pemehue, Gorbea, Piedras Negras and Llastuco Soil Series) from Southern Chile. We applied Hedley chemical sequential fractionation to soils in order to examine the potential differences in extractable soil inorganic P (Pi) and organic P (Po) fractions. We also determined total P and Olsen P in these grassland Andisols. Oxalate and pyrophosphate were employed to determine the active and organic matter complexed Al and Fe, respectively. Furthermore, we quantified Al and Fe in extracts of the Hedley P fractions. We found that Al extracted in oxalate was correlated positively with labile Po concentration, specifically with both the NaHCO3-Po(r=0.45, P≤0.01), and the NaOH-Po (r=0.43, P≤0.01) fractions. This observation was reinforced by 31P-NMR analysis that showed higher monoester P and myo-IP6 content in soils with higher amounts of oxalate Al. Hedley sequential fractionation procedure confirmed the role of Al in the NaOH-Po fraction for promoting Po storage, as both fractions were correlated (r=0.33, P≤0.05). In addition, Fe plays a substantial role in recalcitrant P accumulation as we found a high correlation between residual P and oxalate Fe (r=0.55, P≤0.01).info:eu-repo/semantics/openAccessChilean Society of Soil Science / Sociedad Chilena de la Ciencia del SueloJournal of soil science and plant nutrition v.16 n.2 20162016-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162016000200016en10.4067/S0718-95162016005000041
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Aluminum phosphorus availability iron andisol
spellingShingle	Aluminum phosphorus availability iron andisol Redel,Y Cartes,P Demanet,R Velásquez,G Poblete-Grant,P Bol,R Mora,M. L Assessment of phosphorus status influenced by Al and Fe compounds in volcanic grassland soils
description	Volcanic ash derived soils represent between 50-60% of the total arable land area of southern of Chile, and they are the most important soils for pasture production. In these soils, high phosphorus (P) fixation and, in turn, low P availability and high aluminium (Al) soluble concentrations (at low pH) are the most limiting factors for pasture production. At the same time, the complexes between Al-or iron- (Fe) and organic matter as well as short-range order alumino-silicates (allophane) allow the retention of huge quantities of soil P. The aim of this work was to assess the status of P by both sequential extraction procedure (Hedley) and 31P-NMR analysis as influenced by Al and Fe in volcanic grasslands Andisols (Pemehue, Gorbea, Piedras Negras and Llastuco Soil Series) from Southern Chile. We applied Hedley chemical sequential fractionation to soils in order to examine the potential differences in extractable soil inorganic P (Pi) and organic P (Po) fractions. We also determined total P and Olsen P in these grassland Andisols. Oxalate and pyrophosphate were employed to determine the active and organic matter complexed Al and Fe, respectively. Furthermore, we quantified Al and Fe in extracts of the Hedley P fractions. We found that Al extracted in oxalate was correlated positively with labile Po concentration, specifically with both the NaHCO3-Po(r=0.45, P≤0.01), and the NaOH-Po (r=0.43, P≤0.01) fractions. This observation was reinforced by 31P-NMR analysis that showed higher monoester P and myo-IP6 content in soils with higher amounts of oxalate Al. Hedley sequential fractionation procedure confirmed the role of Al in the NaOH-Po fraction for promoting Po storage, as both fractions were correlated (r=0.33, P≤0.05). In addition, Fe plays a substantial role in recalcitrant P accumulation as we found a high correlation between residual P and oxalate Fe (r=0.55, P≤0.01).
author	Redel,Y Cartes,P Demanet,R Velásquez,G Poblete-Grant,P Bol,R Mora,M. L
author_facet	Redel,Y Cartes,P Demanet,R Velásquez,G Poblete-Grant,P Bol,R Mora,M. L
author_sort	Redel,Y
title	Assessment of phosphorus status influenced by Al and Fe compounds in volcanic grassland soils
title_short	Assessment of phosphorus status influenced by Al and Fe compounds in volcanic grassland soils
title_full	Assessment of phosphorus status influenced by Al and Fe compounds in volcanic grassland soils
title_fullStr	Assessment of phosphorus status influenced by Al and Fe compounds in volcanic grassland soils
title_full_unstemmed	Assessment of phosphorus status influenced by Al and Fe compounds in volcanic grassland soils
title_sort	assessment of phosphorus status influenced by al and fe compounds in volcanic grassland soils
publisher	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo
publishDate	2016
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162016000200016
work_keys_str_mv	AT redely assessmentofphosphorusstatusinfluencedbyalandfecompoundsinvolcanicgrasslandsoils AT cartesp assessmentofphosphorusstatusinfluencedbyalandfecompoundsinvolcanicgrasslandsoils AT demanetr assessmentofphosphorusstatusinfluencedbyalandfecompoundsinvolcanicgrasslandsoils AT velasquezg assessmentofphosphorusstatusinfluencedbyalandfecompoundsinvolcanicgrasslandsoils AT pobletegrantp assessmentofphosphorusstatusinfluencedbyalandfecompoundsinvolcanicgrasslandsoils AT bolr assessmentofphosphorusstatusinfluencedbyalandfecompoundsinvolcanicgrasslandsoils AT moraml assessmentofphosphorusstatusinfluencedbyalandfecompoundsinvolcanicgrasslandsoils
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Assessment of phosphorus status influenced by Al and Fe compounds in volcanic grassland soils

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