The High‐ and Low‐energy Phosphate Adsorbing Surfaces in Calcareous Soils

Holfordi, I. C. R; Mattingly, G. E. G.

doi:10.1111/j.1365-2389.1975.tb01964.x

Cited by 113 publications

(66 citation statements)

References 22 publications

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“…Much of the adsorption attributed to it, however, may actually be due to hydrous ferric oxide impurities". Holford and Mattingly (1975) have also shown that, in calcareous soils, free iron oxides were the main soil variable related to the high-energy phosphate-adsorbing surface and the low-energy P adsorbents were correlated with organic matter and surface area of calcium carbonate. Similarly, concluded that Al ox and Fe ox were the best variables to explain P sorption capacities in neutral and calcareous soils from Québec.…”

Section: Suitability Of P Saturation Indices For P Management In Québmentioning

confidence: 99%

Soil phosphorus saturation degree: Review of some indices and their suitability for P management in Québec, Canada

Beauchemin¹,

Simard²

1999

Can. J. Soil. Sci.

149

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Beauchemin, S. and Simard, R. R. 1999. Soil phosphorus saturation degree: Review of some indices and their suitability for P management in Québec, Canada. Can. J. Soil Sci. 79: 615-625. Many agricultural fields contain excessive labile soil P in regard to crop needs. Its environmental fate must be assessed. The concept of P saturation degree is meaningful as it describes the portion of the soil binding sites already covered with P, and indicates the potential desorbability of soil P. The first objective of this study was to review different indices that have been proposed to estimate the degree of soil P saturation and the relationships between soil P saturation degree and P solubility. The second objective is to discuss their suitability as environmental indicators for P management in the province of Québec, Canada. In the Netherlands, the P saturation index is defined as the ratio of P to Al + Fe contents extracted by ammonium oxalate [P ox /(Al ox + Fe ox ) or (P ox /0.5(Al ox + Fe ox )]. This approach has been mainly used with non-calcareous soils. In Québec, the ratio of Mehlich-III extractable P to Al (M3P/AlM3) is proposed as an alternative, which relies on routine laboratory test. However, the suitability of the M3P/AlM3 ratio has yet to be determined for some specific soil groups (e.g. gleyed soils, soils with Al ox content >6 g kg -1 ) and for subsoil horizons. Regardless of the chosen index, it is suggested that the best way to manage the risk of water contamination by P in Québec (namely, defining critical levels of soil P saturation) may be to form homogeneous soil groups to account for their distinctive behaviour and characteristics.Key words: Phosphorus, saturation, management Beauchemin, S. et Simard, R. R. 1999. Degré de saturation en P du sol: revue de quelques indices et de leur utilité pour la gestion du P au Québec, Canada. Can. J. Soil Sci. 79: 615-625. Plusieurs sols agricoles présentent des teneurs excessives en P labile comparées aux besoins des cultures. Le devenir environnemental de ce P doit être évalué. La notion de degré de saturation en P d'un sol est particulièrement intéressante parce qu'elle donne une mesure de la proportion des sites de sorption déjà occupés par le P tout en indiquant le potentiel de désorption du P. Le premier objectif de cette étude est de revoir différents indices qui ont été proposés pour estimer le degré de saturation en P du sol et la fiabilité de ces indices à prédire la solubilité du P dans différents types de sol. Le deuxième objectif est de faire ressortir certains aspects à considérer pour favoriser pleinement leur utilisation comme indicateurs environnementaux dans la gestion du P pour la province de Québec, Canada. En Hollande, l'index de saturation en P est défini par le rapport entre le contenu en P et celui en Fe et Al extraits par l'oxalate d'ammonium [P ox /(Al ox + Fe ox ) ou (P ox /0.5(Al ox + Fe ox )]. Ces indices ont été étudiés principalement sur des sols non calcaires. Au Québec, le rapport entre le contenu en P et celui en Al extrait au...

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Section: Suitability Of P Saturation Indices For P Management In Québmentioning

confidence: 99%

Soil phosphorus saturation degree: Review of some indices and their suitability for P management in Québec, Canada

Beauchemin¹,

Simard²

1999

Can. J. Soil. Sci.

149

View full text Add to dashboard Cite

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“…The P sorption affinity, P adsorption maxima and EPR values were much lower in these soils than in the soils under CT. The low biodegradation of these high contents of organic matter may have, as some of its products, humic substances such as organic acid anions such as citrate and tartarate whose concentrations in the rhizosphere may reach a level high enough to enable them compete strongly with phosphate anions for adsorption sites on reactive surfaces of solid constituents such as oxides of Fe and Al (Holford and Mattingly, 1975 ), but greater amounts are found in the rhizosphere of crop plants (Vance et al, 1996). It has been observed that the organic acids (the tri-carboxylic and di-carboxylic acids) that most commonly occur in soils are effective in reducing phosphate sorption, whereas monocarboxylic acids have little effect on phosphate sorption (Hingston et al, 1971;Earl et al, 1979;Yuan, 1980;Sibanda and Young, 1986;Violante et al, 1991Violante et al, , 1996.…”

Section: Soil Organic Mattermentioning

confidence: 99%

Soil management effects on phosphorus sorption and external P requirement in oxisols of Malawi

Mnthambala¹,

Maida²,

Lowole³

et al. 2016

J. Soil Sci. Environ. Manage.

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Oxisols are one of the major soils of Malawi and they are high in P sorption. Conservation agriculture has been practiced on this soil for some years now but soil management effects on P sorption and external P requirement (EPR) of Oxisols in Malawi have not, however, been determined. Soil management effects on P sorption and EPR of Oxisols in Malawi were therefore determined in the present study. The effects studied were conventional tillage (CT), no-tillage (NT) and crop rotation (CR). The soils differed considerably in their sorption characteristics, with the sorption maxima ranging from 413 to 345 mg P kg -1 . Differences in sorption maxima and affinity due to soil management effects were statistically significantly (P ≤ 0.05). The sorption affinity (b) values ranged from 0.48 to 0.72 dm 3 mg -1 and differences due to soil management effects were statistically significant (P ≤ 0.05) only between conventional tillage (CT) and no tillage (NT) or crop rotation (CR). The sorption affinity due to NT was not statistically significant from that of CR. The b values were the highest in soils that had been subjected to CT.

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“…Nevertheless, the acceptance in the literature of these multisite ideas has been highly contested. For example, Syers et al (1973), Holford et al (1974), Mattingly (1975), andShuman (1975) proposed that a two-surface Langmuir equation (that is, a combination of two Langmuir equations) can be used to accurately describe ion adsorption by soils. Posner and Bowden (1980), however, criticized this approach and stated that it should not be used "unless there is some a priori reasoning for doing so."…”

Section: Competitive and Multisite Adsorption Modelsmentioning

confidence: 99%

Historical Perspective on the Tools That Helped Shape Soil Chemistry

Schulthess

2011

Soil Science Society of America Journal

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SSSA 75 th Anniversary Paper T he tools of soil chemistry include instruments, mathematics, models, and software. Th ere is also the mind and imagination. Th roughout the history of our science, we have been shift ing away from a very labor-intensive laboratory environment, where long hours of concentration on tedious tasks was the norm. Th is change in the way we work has been accelerating, particularly since the 1950s. We are accomplishing more work but with less eff ort and more time to contemplate what the data are trying to tell us. Th e essence of our research activity has changed dramatically.Numerous laboratory tools have been used in soil chemistry during the last 200 yr, and the major changes that have occurred are highlighted here. It is hoped that the picture presented will help us decide how to better train our students for the future. By knowing how we have changed in the past and how we appear to be changing in the present, we can perhaps trace the path that we are taking, at least in the near future.Eight major themes are addressed here:1. Th e early years reviews the research environment of the 1800s up to the early 1900s. It marks the beginning years of soil chemistry that shaped many of our ideas for the decades that followed.2. Th e age of electronics covers the early part of the 1900s and the origins of the fi rst portable meters on the market.3. Spectroscopy is at the core of most of our modern methods of analysis. While the development of only a few tools are described here, the impact of spectroscopy on our current research activity cannot be understated.

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The High‐ and Low‐energy Phosphate Adsorbing Surfaces in Calcareous Soils

Cited by 113 publications

References 22 publications

Soil phosphorus saturation degree: Review of some indices and their suitability for P management in Québec, Canada

Soil phosphorus saturation degree: Review of some indices and their suitability for P management in Québec, Canada

Soil management effects on phosphorus sorption and external P requirement in oxisols of Malawi

Historical Perspective on the Tools That Helped Shape Soil Chemistry

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