Results 251 to 260 of about 26,126 (298)
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Mössbauer analysis of Brazilian Oxisols
Hyperfine Interactions, 1986Three sets of Brazilian Oxisols have been analysed by Mossbauer spectroscopy at 290, 80 and 4.2 K. In most cases two resolved magnetic hyperfine patterns associated with aluminous goethite and hematite are resolved; their ratio is related to soil colour. Samples from a 3 m soil profile show that both oxides become decreasingly aluminium substituted and/
J. D. Fabris +3 more
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Positive Permanent Charge in Oxisols
Soil Science Society of America Journal, 1982Abstract The existences of a positive permanent charge can be inferred from charge characteristics of highly weathered tropical soils; it was found to be related to isomorphous substitution of Ti(IV) for Fe(III) in iron oxides. Comparable near‐constant values were found from anion adsorption at pH 7.0 to 9.0.
Tessens, E., Zauyah, Siti
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1983
Publisher Summary The taxon of Oxisols contains intensively weathered soils, most of which occur in tropical or subtropical regions. As a rule, they are found on old land surfaces or in sediments that are derived from them, although they may also form in rapidly weathering materials.
A. Van Wambeke +3 more
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Publisher Summary The taxon of Oxisols contains intensively weathered soils, most of which occur in tropical or subtropical regions. As a rule, they are found on old land surfaces or in sediments that are derived from them, although they may also form in rapidly weathering materials.
A. Van Wambeke +3 more
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57Fe Mössbauer studies of oxisols
Hyperfine Interactions, 1991Mossbauer spectroscopy is a valuable complement to the standard analytical techniques of soil science for characterizing the iron content of soils, and for studying the mineralogical transformations that occur during pedogenesis from the point of view of the iron.
J. M. D. Coey +2 more
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Monovalent Ion Adsorption by an Oxisol
Soil Science Society of America Journal, 1987Abstract An experimental method was developed to measure simultaneously the net proton surface charge density (σ H ) and surface excesses of metal ( n M ) and ligand ( n L
Laurent Charlet, Garrison Sposito
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Magnetic properties of iron-rich oxisols
Physics and Chemistry of Minerals, 1988Four occurrences of highly magnetic soil in Brazil have been analysed with a view to identifying the magnetic minerals and quantifying the soil magnetization. Techniques used include X-ray diffraction, X-ray fluorescence and Mossbauer spectroscopy. This approach leads us to identify several ways that these soils, which have spontaneous magnetization in
Jacqueline E. M. Allan +3 more
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Bivalent Ion Adsorption by an Oxisol
Soil Science Society of America Journal, 1989Abstract Surface excesses of the bivalent ions Ca 2+ , Mg 2+ , and SO 2‐ 4 were measured on a Brazilian Oxisol suspended in Ca(ClO 4 )
Laurent Charlet, Garrison Sposito
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Phosphate Adsorption on an Oxisol
Soil Science Society of America Journal, 1977Abstract Adsorption isotherms for phosphate on the A and B horizon of an oxisol from Papua New Guinea showed high affinity adsorption at low solution concentrations and a linear increase in adsorption at higher solution concentrations. Adsorption increased with decrease in pH in the range 3 to 8.
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INTERACTION OF ORGANIC PHOSPHORUS WITH CLAYS EXTRACTED FROM OXISOLS
Soil Science, 2008In highly weathered soils, such as tropical soils, organic phosphorus (P) may decline together with total P and could be represented by a relatively lower amount of inositol phosphates compared with temperate soils. The aim of this work was to understand the abiotic processes leading to inositol phosphate retention in highly weathered soils.
Giaveno C. +5 more
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Tree growth on a compacted Oxisol
Soil and Tillage Research, 1991Abstract For a site at Barora, Solomon Islands, assessment was made of survival and growth of Gmelina arborea and Terminalia brassii planted on a heavy clay soil degraded by crawler tractor logging of primary forest and other processes. Experimental paired plots were established in 1981 on six classes of degraded soil and in undisturbed forest as a ...
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