Phosphorus Loss in Overfertilized Soils: The Selective P Partitioning and Redistribution Between Particle Size Separates

Riccardo Scalenghe, Barberis, Anthony C. Edwards

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19 Citazioni (Scopus)

Abstract

Using 12 well-characterised European soils contrasting in their physical and chemical properties, we demonstrate significant differences in the partitioning of phosphorus (P) between various particle size separates. Samples of each soil were subjected to one of three methods of increasingly aggressive dispersion in the order water (WD), mechanical (MD) or chemical (CD). A general, although not exclusive, inverse relationship existed between the concentration of various attributes (these included organic carbon, oxalate and dithionite iron contents, total P, resin and water extractable P) and particle size. The quantity, composition and physico-chemical properties of individual size separates were sensitive to the dispersion method used. This suggested an interaction between the ease of dispersion and particulate properties even within a single size class. Typically the total P concentration was highest in the most easily dispersed (WD) clay fraction. The total P content of the whole soil could be reasonably obtained by summing the appropriate quantities of each particle size material, however, resin and water extractable P were not adequately predicted using this approach. Together these observations have implications for laboratory and field situations where artificial disaggregation and/or selective separation and transport of fine soil material may occur. Finally a comparison of water soluble P between whole soils and their MD dispersed size fractions suggested three broad situations might exist, where either sorption processes, a precipitate or some combined P precipitate and sorption mechanism controlled P release.
Lingua originaleEnglish
pagine (da-a)72-80
RivistaEuropean Journal of Agronomy
Volume27
Stato di pubblicazionePublished - 2007

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particle size
partitioning
phosphorus
sorption
resins
soil
physicochemical properties
water
chemical property
resin
clay fraction
oxalates
oxalate
physical properties
particulates
soil sampling
iron
physical property
organic carbon
loss

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Soil Science
  • Plant Science

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title = "Phosphorus Loss in Overfertilized Soils: The Selective P Partitioning and Redistribution Between Particle Size Separates",
abstract = "Using 12 well-characterised European soils contrasting in their physical and chemical properties, we demonstrate significant differences in the partitioning of phosphorus (P) between various particle size separates. Samples of each soil were subjected to one of three methods of increasingly aggressive dispersion in the order water (WD), mechanical (MD) or chemical (CD). A general, although not exclusive, inverse relationship existed between the concentration of various attributes (these included organic carbon, oxalate and dithionite iron contents, total P, resin and water extractable P) and particle size. The quantity, composition and physico-chemical properties of individual size separates were sensitive to the dispersion method used. This suggested an interaction between the ease of dispersion and particulate properties even within a single size class. Typically the total P concentration was highest in the most easily dispersed (WD) clay fraction. The total P content of the whole soil could be reasonably obtained by summing the appropriate quantities of each particle size material, however, resin and water extractable P were not adequately predicted using this approach. Together these observations have implications for laboratory and field situations where artificial disaggregation and/or selective separation and transport of fine soil material may occur. Finally a comparison of water soluble P between whole soils and their MD dispersed size fractions suggested three broad situations might exist, where either sorption processes, a precipitate or some combined P precipitate and sorption mechanism controlled P release.",
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T1 - Phosphorus Loss in Overfertilized Soils: The Selective P Partitioning and Redistribution Between Particle Size Separates

AU - Scalenghe, Riccardo

AU - Barberis, null

AU - Edwards, Anthony C.

PY - 2007

Y1 - 2007

N2 - Using 12 well-characterised European soils contrasting in their physical and chemical properties, we demonstrate significant differences in the partitioning of phosphorus (P) between various particle size separates. Samples of each soil were subjected to one of three methods of increasingly aggressive dispersion in the order water (WD), mechanical (MD) or chemical (CD). A general, although not exclusive, inverse relationship existed between the concentration of various attributes (these included organic carbon, oxalate and dithionite iron contents, total P, resin and water extractable P) and particle size. The quantity, composition and physico-chemical properties of individual size separates were sensitive to the dispersion method used. This suggested an interaction between the ease of dispersion and particulate properties even within a single size class. Typically the total P concentration was highest in the most easily dispersed (WD) clay fraction. The total P content of the whole soil could be reasonably obtained by summing the appropriate quantities of each particle size material, however, resin and water extractable P were not adequately predicted using this approach. Together these observations have implications for laboratory and field situations where artificial disaggregation and/or selective separation and transport of fine soil material may occur. Finally a comparison of water soluble P between whole soils and their MD dispersed size fractions suggested three broad situations might exist, where either sorption processes, a precipitate or some combined P precipitate and sorption mechanism controlled P release.

AB - Using 12 well-characterised European soils contrasting in their physical and chemical properties, we demonstrate significant differences in the partitioning of phosphorus (P) between various particle size separates. Samples of each soil were subjected to one of three methods of increasingly aggressive dispersion in the order water (WD), mechanical (MD) or chemical (CD). A general, although not exclusive, inverse relationship existed between the concentration of various attributes (these included organic carbon, oxalate and dithionite iron contents, total P, resin and water extractable P) and particle size. The quantity, composition and physico-chemical properties of individual size separates were sensitive to the dispersion method used. This suggested an interaction between the ease of dispersion and particulate properties even within a single size class. Typically the total P concentration was highest in the most easily dispersed (WD) clay fraction. The total P content of the whole soil could be reasonably obtained by summing the appropriate quantities of each particle size material, however, resin and water extractable P were not adequately predicted using this approach. Together these observations have implications for laboratory and field situations where artificial disaggregation and/or selective separation and transport of fine soil material may occur. Finally a comparison of water soluble P between whole soils and their MD dispersed size fractions suggested three broad situations might exist, where either sorption processes, a precipitate or some combined P precipitate and sorption mechanism controlled P release.

UR - http://hdl.handle.net/10447/8360

M3 - Article

VL - 27

SP - 72

EP - 80

JO - European Journal of Agronomy

JF - European Journal of Agronomy

SN - 1161-0301

ER -