Desorption of phosphate in oxisols covered by humid brushland cerrado. I. The reversibility of the adsorption isotherm with respect to phosphate concentration.

Detalhes bibliográficos
Autor(a) principal: Leal, Jair Rocha
Data de Publicação: 2014
Outros Autores: Velloso, Ary Carlos Xavier
Tipo de documento: Artigo
Idioma: por
Título da fonte: Pesquisa Agropecuária Brasileira (Online)
Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/17402
Resumo: Studies were conducted in oxisols under cerrado (savannah) vegetation to investigate the reversibility of the isotherm with respect to phosphate concentration. This was achieved by replacing the equilibrium H2HPO4 solutions by 0.2M KCl at the same pH and temperature. Successive extractions with 0,02M KCl showed a definitive influence of the isotherm region on phosphate desorption decreasing in the order: Region III > Region II > Region I. The amounts of phosphate desorbed decreased rapidly in the successive 0,02M KCl extractions, the first two extractions desorbing approximately 50% of the total desorbed in six extractions. It was suggested that for this particular situation (P-adsorbed), the successive soil P extractions seemed a satisfactory general means of measuring the capacity factor, i.e., the soil to continue to supply phosphorus to the soil solution.
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spelling Desorption of phosphate in oxisols covered by humid brushland cerrado. I. The reversibility of the adsorption isotherm with respect to phosphate concentration.Dessorção do fosfato adsorvido em latossolos sob vegetação de cerrado. I. Reversibilidade da isoterma de adsorção em relação à concentração de fosfatoStudies were conducted in oxisols under cerrado (savannah) vegetation to investigate the reversibility of the isotherm with respect to phosphate concentration. This was achieved by replacing the equilibrium H2HPO4 solutions by 0.2M KCl at the same pH and temperature. Successive extractions with 0,02M KCl showed a definitive influence of the isotherm region on phosphate desorption decreasing in the order: Region III > Region II > Region I. The amounts of phosphate desorbed decreased rapidly in the successive 0,02M KCl extractions, the first two extractions desorbing approximately 50% of the total desorbed in six extractions. It was suggested that for this particular situation (P-adsorbed), the successive soil P extractions seemed a satisfactory general means of measuring the capacity factor, i.e., the soil to continue to supply phosphorus to the soil solution.Foi feito um estudo da reversibilidade do fosfato adsorvido em relação à concentração em nove latossolos sob vegetação de cerrado. Para isso as soluções de KH2PO4 em equilíbrio com o solo propiciando diversas doses de fosfato adsorvido foi substituída por solução 0,02 M de KCl nas mesmas condições de pH e temperatura, seguindo-se outra agitação para se estabelecer novo equilíbrio. As extrações sucessivas com solução de KCl mostraram uma influência das regiões da isoterma na dessorção, decrescendo na ordem região III > região II > região I. As quantidades de fosfato dessorvido decresceram rapidamente nas extrações sucessivas, sendo que as duas primeiras extrações dessorveram cerca de 50% do total dessorvido em seis extrações. Este total dessorvido corresponde a uma percentagem pequena do fosfato inicialmente presente no solo (20%) em níveis menos saturados com fosfato. É sugerido não ser o teor de fosfato na solução do solo um bom critério para avaliar o suprimento de fosfato ao longo do período de crescimento das plantas.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraLeal, Jair RochaVelloso, Ary Carlos Xavier2014-04-15info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/17402Pesquisa Agropecuaria Brasileira; v.7, n.6, 1972: Série Agronomia; 193-197Pesquisa Agropecuária Brasileira; v.7, n.6, 1972: Série Agronomia; 193-1971678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/17402/11666info:eu-repo/semantics/openAccess2014-04-15T18:40:32Zoai:ojs.seer.sct.embrapa.br:article/17402Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2014-04-15T18:40:32Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Desorption of phosphate in oxisols covered by humid brushland cerrado. I. The reversibility of the adsorption isotherm with respect to phosphate concentration.
Dessorção do fosfato adsorvido em latossolos sob vegetação de cerrado. I. Reversibilidade da isoterma de adsorção em relação à concentração de fosfato
title Desorption of phosphate in oxisols covered by humid brushland cerrado. I. The reversibility of the adsorption isotherm with respect to phosphate concentration.
spellingShingle Desorption of phosphate in oxisols covered by humid brushland cerrado. I. The reversibility of the adsorption isotherm with respect to phosphate concentration.
Leal, Jair Rocha
title_short Desorption of phosphate in oxisols covered by humid brushland cerrado. I. The reversibility of the adsorption isotherm with respect to phosphate concentration.
title_full Desorption of phosphate in oxisols covered by humid brushland cerrado. I. The reversibility of the adsorption isotherm with respect to phosphate concentration.
title_fullStr Desorption of phosphate in oxisols covered by humid brushland cerrado. I. The reversibility of the adsorption isotherm with respect to phosphate concentration.
title_full_unstemmed Desorption of phosphate in oxisols covered by humid brushland cerrado. I. The reversibility of the adsorption isotherm with respect to phosphate concentration.
title_sort Desorption of phosphate in oxisols covered by humid brushland cerrado. I. The reversibility of the adsorption isotherm with respect to phosphate concentration.
author Leal, Jair Rocha
author_facet Leal, Jair Rocha
Velloso, Ary Carlos Xavier
author_role author
author2 Velloso, Ary Carlos Xavier
author2_role author
dc.contributor.none.fl_str_mv

dc.contributor.author.fl_str_mv Leal, Jair Rocha
Velloso, Ary Carlos Xavier
dc.subject.none.fl_str_mv

description Studies were conducted in oxisols under cerrado (savannah) vegetation to investigate the reversibility of the isotherm with respect to phosphate concentration. This was achieved by replacing the equilibrium H2HPO4 solutions by 0.2M KCl at the same pH and temperature. Successive extractions with 0,02M KCl showed a definitive influence of the isotherm region on phosphate desorption decreasing in the order: Region III > Region II > Region I. The amounts of phosphate desorbed decreased rapidly in the successive 0,02M KCl extractions, the first two extractions desorbing approximately 50% of the total desorbed in six extractions. It was suggested that for this particular situation (P-adsorbed), the successive soil P extractions seemed a satisfactory general means of measuring the capacity factor, i.e., the soil to continue to supply phosphorus to the soil solution.
publishDate 2014
dc.date.none.fl_str_mv 2014-04-15
dc.type.none.fl_str_mv
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/17402
url https://seer.sct.embrapa.br/index.php/pab/article/view/17402
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/17402/11666
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
dc.source.none.fl_str_mv Pesquisa Agropecuaria Brasileira; v.7, n.6, 1972: Série Agronomia; 193-197
Pesquisa Agropecuária Brasileira; v.7, n.6, 1972: Série Agronomia; 193-197
1678-3921
0100-104x
reponame:Pesquisa Agropecuária Brasileira (Online)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Pesquisa Agropecuária Brasileira (Online)
collection Pesquisa Agropecuária Brasileira (Online)
repository.name.fl_str_mv Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv pab@sct.embrapa.br || sct.pab@embrapa.br
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