Reduction of exchangeable calcium and magnesium in soil with increasing pH

Reduction of exchangeable calcium and magnesium in soil with increasing pH

A laboratory study was conducted with soil samples and synthetic solutions to investigate possible mechanisms related with reduction in KCl exchangeable Ca and Mg with increasing pH. Increasing soil pH over 5.3 with CaCO3 added to the soil and with NaOH solution added to soil/KCl suspension increased adsorptions of Ca and Mg. The reduction of Mg was greater than Ca and was related to the concentration of soil exchangeable Al. The decreases of soluble Ca and Mg following addition of Al in synthetic solution were at pH > 7.5. The isomorphic coprecipitation reaction with Al compounds may be the most possible mechanism responsible for the decrease of exchangeable Ca and Mg with increasing pH. Possible chemical reactions are presented.

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Main Authors: Miyazawa,Mário, Pavan,Marcos A., Ziglio,Cláudio O., Franchini,Júlio C.
Format: Digital revista
Language:English
Published: Instituto de Tecnologia do Paraná - Tecpar 2001
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000200007
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spelling oai:scielo:S1516-891320010002000072001-11-07Reduction of exchangeable calcium and magnesium in soil with increasing pHMiyazawa,MárioPavan,Marcos A.Ziglio,Cláudio O.Franchini,Júlio C. Coprecipitation aluminum liming acid soils A laboratory study was conducted with soil samples and synthetic solutions to investigate possible mechanisms related with reduction in KCl exchangeable Ca and Mg with increasing pH. Increasing soil pH over 5.3 with CaCO3 added to the soil and with NaOH solution added to soil/KCl suspension increased adsorptions of Ca and Mg. The reduction of Mg was greater than Ca and was related to the concentration of soil exchangeable Al. The decreases of soluble Ca and Mg following addition of Al in synthetic solution were at pH > 7.5. The isomorphic coprecipitation reaction with Al compounds may be the most possible mechanism responsible for the decrease of exchangeable Ca and Mg with increasing pH. Possible chemical reactions are presented.info:eu-repo/semantics/openAccessInstituto de Tecnologia do Paraná - TecparBrazilian Archives of Biology and Technology v.44 n.2 20012001-06-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000200007en10.1590/S1516-89132001000200007
institution SCIELO
collection OJS
country Brasil
countrycode BR
component Revista
access En linea
databasecode rev-scielo-br
tag revista
region America del Sur
libraryname SciELO
language English
format Digital
author Miyazawa,Mário
Pavan,Marcos A.
Ziglio,Cláudio O.
Franchini,Júlio C.
spellingShingle Miyazawa,Mário
Pavan,Marcos A.
Ziglio,Cláudio O.
Franchini,Júlio C.
Reduction of exchangeable calcium and magnesium in soil with increasing pH
author_facet Miyazawa,Mário
Pavan,Marcos A.
Ziglio,Cláudio O.
Franchini,Júlio C.
author_sort Miyazawa,Mário
title Reduction of exchangeable calcium and magnesium in soil with increasing pH
title_short Reduction of exchangeable calcium and magnesium in soil with increasing pH
title_full Reduction of exchangeable calcium and magnesium in soil with increasing pH
title_fullStr Reduction of exchangeable calcium and magnesium in soil with increasing pH
title_full_unstemmed Reduction of exchangeable calcium and magnesium in soil with increasing pH
title_sort reduction of exchangeable calcium and magnesium in soil with increasing ph
description A laboratory study was conducted with soil samples and synthetic solutions to investigate possible mechanisms related with reduction in KCl exchangeable Ca and Mg with increasing pH. Increasing soil pH over 5.3 with CaCO3 added to the soil and with NaOH solution added to soil/KCl suspension increased adsorptions of Ca and Mg. The reduction of Mg was greater than Ca and was related to the concentration of soil exchangeable Al. The decreases of soluble Ca and Mg following addition of Al in synthetic solution were at pH > 7.5. The isomorphic coprecipitation reaction with Al compounds may be the most possible mechanism responsible for the decrease of exchangeable Ca and Mg with increasing pH. Possible chemical reactions are presented.
publisher Instituto de Tecnologia do Paraná - Tecpar
publishDate 2001
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000200007
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AT pavanmarcosa reductionofexchangeablecalciumandmagnesiuminsoilwithincreasingph
AT ziglioclaudioo reductionofexchangeablecalciumandmagnesiuminsoilwithincreasingph
AT franchinijulioc reductionofexchangeablecalciumandmagnesiuminsoilwithincreasingph
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