Organic matter-phosphorus associations as a sink in P-fixation processes in allophanic soils of Chile

Borie, Fernando; Zunino, Hugo Marcelo

doi:10.1016/0038-0717(83)90056-1

Cited by 93 publications

(46 citation statements)

References 8 publications

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“…The P concentrations recorded in our study were similar to those reported for Chilean Andisols (Borie and Zunino, 1983;Escudey et al, 2001;Pinochet et al, 2001;Briceno et al, 2004). In general, the P distribution showed that after Headley fractionation, more than 40% of P remained in the residual fraction in all…”

Section: Phosphorus Fractionationsupporting

confidence: 91%

“…This in turn means that many Andisols in agroecosystems contain very high concentrations of P, very little of which is immediately plant available (Borie and Rubio, 2003;Escudey et al, 2001;Pinochet et al, 2001;Briceño et al, 2004;Redel et al, 2007). Soil organic matter plays an important role in P accumulation in Andisols (Escudey et al, 2001;Briceno et al, 2004), and Borie and Zunino, (1983) proposed that P added in fertilizer was stabilized by organic matter through a combination of physicochemical and biological processes. Despite the importance of organic matter for P stabilization in Andisols, up to now no study was carried out to investigate the impact of fertilization on chemical forms of P in relation to SOM composition.…”

Section: Introductionmentioning

confidence: 99%

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Fertilizer effects on phosphorus fractions and organic matter in Andisols

Velásquez

Calabi-Floody

Poblete-Grant

et al. 2016

J. Soil Sci. Plant Nutr.

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Andisols are characterized by a high phosphorus (P) fixation capacity, which is a limiting factor for plant production. Continuous application of P fertilizer may result in an accumulation of P associated with soil organic matter (SOM), which further acts to reduce the availability of the added P. The objectives of this study were (1) to evaluate the impact of P fertilizer inputs on the quantities and chemical forms of P, and (2) to investigate relationships between P forms SOM and land use. Topsoil (0-20 cm) and subsoil (20-40 cm) samples were taken from two Andisols series under grassland and arable cropping. Soil P forms were determined using sequential fractionation, while SOM analysis involved a combination of 13 C nuclear magnetic resonance (NMR) spectroscopy and pyrolysis-GC-mass spectrometry. Fertilization increased total P, total organic P, organic carbon, and inorganic P fractions, mainly in arable soils. Labile P was higher in grassland (3% of total P) than in arable soils (1% of total P). A clear effect of fertilization was observed on organic matter compounds measured by pyrolysis in both soil depths. Interestingly, the polysaccharide-derived compounds increased in fertilized soils and lipidderived compounds decreased. Thus fertilization principally affected labile P and labile SOM forms, whereas recalcitrant forms of P and SOM remained unchanged.

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Section: Phosphorus Fractionationsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Fertilizer effects on phosphorus fractions and organic matter in Andisols

Velásquez

Calabi-Floody

Poblete-Grant

et al. 2016

J. Soil Sci. Plant Nutr.

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“…In volcanic soils Broquen et al (2005) and Satti et al (2007) investigated acidification processes in a forest Andisol climatic sequence; they found that in drier climates a less strong Al and P retention occurred. In Chilean Andisols, there are several reports on P fractionation; some of them include 31 P-NMR analysis (Borie and Zunino, 1983;Borie et al, 2002;Redel et al, 2007;2008;Velásquez et al, 2016a, b) and pyrophosphate/ oxalate Al and Fe determinations (Mora and Canales, 1995;Matus et al, 2006;Panichini et al, 2012). However, simultaneous determinations of these parameters in the same extract are still lacking.…”

Section: In Volcanic Soils the Formation Of Complexes Betweenmentioning

confidence: 99%

“…Phosphorus sorption to these minerals can protect it against microbial and enzymatic decomposition (Stutter et al, 2015). This protected P can represent more than 90% of any added P (Borie and Zunino, 1983), leaving little P available for plants in spite of high P T and P o contents in volcanic soils (Borie and Rubio 2003).…”

Section: In Volcanic Soils the Formation Of Complexes Betweenmentioning

confidence: 99%

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

Redel

Cartes

Demanet

et al. 2016

J. Soil Sci. Plant Nutr.

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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 31 P-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 (P i ) and organic P (P o ) 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 P o concentration, specifically with both the NaHCO 3 -P o (r=0.45, P≤0.01), and the NaOH-P o (r=0.43, P≤0.01) fractions. This observation was reinforced by 31 P-NMR analysis that showed higher monoester P and myo-IP 6 content in soils with higher amounts of oxalate Al. Hedley sequential fractionation procedure confirmed the role of Al in the NaOH-P o fraction for promoting P o 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).

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“…This facilitates enzymatic hydrolyzation of organically bound phosphorus which may be associated with these humic substances (Haynes & Mokolobate 2001;Jones 1998). Especially in soils containing a large amount of organic matter such as andosols, this mechanism may be crucial because the organic matter is often associated with Al and Fe (Borie & Zunino 1983). As long as organic P is bound with Al or Fe, it remains protected.…”

Section: Introductionmentioning

confidence: 99%

The Role of Cotric Acid as a Phosphorus Mobilization Mechanism in Highly P-Fixing Soils

Drouillon

Merckx

2003

Gayana Bot.

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Exudation of low molecular weight carboxylates is an important phosphorus (P) acquisition strategy for plants in strongly P-fixing soils. The effect of citrate exudation on P availability was studied in five acid soils with a large organic matter content and a low available P pool. The amount of molybdate reactive P extracted by citric acid 10 mM (0.1-2 mg kg -1 ) was larger than the molybdate reactive P (MRP) extracted by CaCl 2 10 -3 M (0.007-0.07 mg kg -1 ). Both extractants were adjusted to soil pH prior to extraction. Also, the total P content of citric acid extracts (2-44 mg kg -1 ) far exceeded the total P content of CaCl 2 (0.2-1.5 mg kg -1 ). However, ratios of MRP to total dissolved P (TDP) remained constant. When citric acid was added to the CaCl 2 -extracts (the pH of citric acid being adjusted to the pH of CaCl 2 , and thus eliminating release of P through acidification) a significant pH increase was noted. Simultaneously, MRP increased significantly in all but one soil. This suggests that the P availability enhancing properties of citric acid are not only due to acidification of the plant rhizosphere, but also to its Al and Fe complexing capacity.KEYWORDS: Andosols, citric acid, phosphorus availability. RESUMENLa exudación de ácidos orgánicos con bajo peso molecular, como el ácido cítrico, es una importante estrategia de adquisición de fósforo (P) para las plantas en suelos que fijan fuertemente el P. El objetivo de la presente investigación fue evaluar el efecto de la exudación de ácido cítrico sobre la disponibilidad de P. Dicho efecto fue estudiado en 5 suelos ácidos con un elevado contenido de materia orgánica y una baja disponibilidad de P. La cantidad de fosfato determinado con molibdato de amonio (MRP), extraído con ácido cítrico 10 mM (0,1-2 mg kg -1 ) fue mayor que la cantidad de MRP extraido con CaCl 2 10 -3 M (0,007-0,07 mg kg -1 ). Ambos extractantes fueron ajustados al pH del suelo antes de realizar la extracción. El contenido de P total extraído con ácido cítri-co, superó en mucho el contenido de P total extraído con CaCl 2 . Sin embargo, el ratio MRP:P total disuelto permaneció constante. Así mismo cuando el ácido cítrico fue añadido al CaCl 2 -el pH del ácido cítrico fué ajustado al pH del CaCl 2 , eliminando así la liberación de P por acidificación-se observó un significante aumento de pH. Simultáneamente, el MRP aumentó en todos los suelos menos en uno. Esto sugiere que las capacidades del áci-do cítrico para aumentar la disponibilidad de P no es sólo debido a la acidificación de la rizosfera de la planta sino también a la capacidad de quelación del Al y Fe.

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Organic matter-phosphorus associations as a sink in P-fixation processes in allophanic soils of Chile

Cited by 93 publications

References 8 publications

Fertilizer effects on phosphorus fractions and organic matter in Andisols

Fertilizer effects on phosphorus fractions and organic matter in Andisols

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

The Role of Cotric Acid as a Phosphorus Mobilization Mechanism in Highly P-Fixing Soils

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