Residual effect evaluation of rock phosphates in Cerrado soils
Autor(a) principal: | |
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Data de Publicação: | 2014 |
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/15271 |
Resumo: | The agronomic effectiveness of phosphate sources were evaluated under field conditions during six years (1975-1981). After this period, soil samples from plots which initially received 44 mg P/kg of soil in the form of soluble phosphates and rock phosphates from Patos de Minas, Araxá and Catalão, were colected in order to evaluate comparative residual effects. To meet this objective, the following procedures were applied: total soil analysis (calcium and phosphorus), P fractionation, resin successive extractions and P isotherms. From the first two procedures, it was possible to estimate that about 20% of the phosphorus broadcasted via rock phosphates, remained as apatite six years after incorporation. Considering the sum of phosphorus absorbed by the plants and extracted by ten consecutive treatments with resins, 43 to 63% of the phosphorus applied was recovered. In relation to the soluble phosphate, the rock phosphates exibited the following indexes of effectiveness: 84 to 89% for Patos, 82% for Araxá and 69% for Catalão. The results, therefore, indicated that the residual effect, after the fifth crop, should be similar considering all sources of phosphorus. |
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Residual effect evaluation of rock phosphates in Cerrado soilsEfeito residual de fosfatos naturais em solos de cerradoPhosphorus; resin; isothermsfósforo; fosfatos; resinas; isotermas de adsorçãoThe agronomic effectiveness of phosphate sources were evaluated under field conditions during six years (1975-1981). After this period, soil samples from plots which initially received 44 mg P/kg of soil in the form of soluble phosphates and rock phosphates from Patos de Minas, Araxá and Catalão, were colected in order to evaluate comparative residual effects. To meet this objective, the following procedures were applied: total soil analysis (calcium and phosphorus), P fractionation, resin successive extractions and P isotherms. From the first two procedures, it was possible to estimate that about 20% of the phosphorus broadcasted via rock phosphates, remained as apatite six years after incorporation. Considering the sum of phosphorus absorbed by the plants and extracted by ten consecutive treatments with resins, 43 to 63% of the phosphorus applied was recovered. In relation to the soluble phosphate, the rock phosphates exibited the following indexes of effectiveness: 84 to 89% for Patos, 82% for Araxá and 69% for Catalão. The results, therefore, indicated that the residual effect, after the fifth crop, should be similar considering all sources of phosphorus.Durante seis anos (1975-1981), a eficiência agronômica de fosfatos foi avaliada através de dois experimentos de campo, com cultivos anuais. Após esse período, amostras de parcelas que haviam recebido, inicialmente, 44 ppm de P (200 kg de P2O5/ha), na forma de superfosfatos e de fosfatos naturais de Patos de Minas, Araxá e Catalão, foram coletadas para análise em laboratório, visando avaliar o efeito residual comparativo. As seguintes técnicas foram utilizadas: análise total de cálcio e fósforo, fracionamento de formas de fósforo, extração sucessiva de fósforo com resinas e isotermas de adsorção desse elemento. Através das duas primeiras técnicas, foi possível estimar que cerca de 20% do fósforo aplicado, via fosfatos naturais, ainda se encontra na forma de apatita, seis anos após sua incorporação ao solo. Considerando-se o total de fósforo absorvido pelos cultivos e mais aquele retirado por dez extrações sucessivas com resinas, foi possível recuperar de 43 a 63% do fósforo adicionado. Em relação aos fosfatos solúveis (supertriplo e supersimples), os fosfatos naturais exibiram os seguintes índices de eficiência: 84 a 89% para Patos, 82% para Araxá e 69% para Catalão. Os resultados obtidos indicam que o efeito residual, após o quinto cultivo, deverá ser similar para as diversas fontes de fósforo.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraGoedert, Wenceslau J.2014-04-16info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/15271Pesquisa Agropecuaria Brasileira; v.18, n.5, maio 1983; 499-506Pesquisa Agropecuária Brasileira; v.18, n.5, maio 1983; 499-5061678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/15271/9100info:eu-repo/semantics/openAccess2014-04-16T18:55:13Zoai:ojs.seer.sct.embrapa.br:article/15271Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2014-04-16T18:55:13Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
Residual effect evaluation of rock phosphates in Cerrado soils Efeito residual de fosfatos naturais em solos de cerrado |
title |
Residual effect evaluation of rock phosphates in Cerrado soils |
spellingShingle |
Residual effect evaluation of rock phosphates in Cerrado soils Goedert, Wenceslau J. Phosphorus; resin; isotherms fósforo; fosfatos; resinas; isotermas de adsorção |
title_short |
Residual effect evaluation of rock phosphates in Cerrado soils |
title_full |
Residual effect evaluation of rock phosphates in Cerrado soils |
title_fullStr |
Residual effect evaluation of rock phosphates in Cerrado soils |
title_full_unstemmed |
Residual effect evaluation of rock phosphates in Cerrado soils |
title_sort |
Residual effect evaluation of rock phosphates in Cerrado soils |
author |
Goedert, Wenceslau J. |
author_facet |
Goedert, Wenceslau J. |
author_role |
author |
dc.contributor.none.fl_str_mv |
|
dc.contributor.author.fl_str_mv |
Goedert, Wenceslau J. |
dc.subject.por.fl_str_mv |
Phosphorus; resin; isotherms fósforo; fosfatos; resinas; isotermas de adsorção |
topic |
Phosphorus; resin; isotherms fósforo; fosfatos; resinas; isotermas de adsorção |
description |
The agronomic effectiveness of phosphate sources were evaluated under field conditions during six years (1975-1981). After this period, soil samples from plots which initially received 44 mg P/kg of soil in the form of soluble phosphates and rock phosphates from Patos de Minas, Araxá and Catalão, were colected in order to evaluate comparative residual effects. To meet this objective, the following procedures were applied: total soil analysis (calcium and phosphorus), P fractionation, resin successive extractions and P isotherms. From the first two procedures, it was possible to estimate that about 20% of the phosphorus broadcasted via rock phosphates, remained as apatite six years after incorporation. Considering the sum of phosphorus absorbed by the plants and extracted by ten consecutive treatments with resins, 43 to 63% of the phosphorus applied was recovered. In relation to the soluble phosphate, the rock phosphates exibited the following indexes of effectiveness: 84 to 89% for Patos, 82% for Araxá and 69% for Catalão. The results, therefore, indicated that the residual effect, after the fifth crop, should be similar considering all sources of phosphorus. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-04-16 |
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/15271 |
url |
https://seer.sct.embrapa.br/index.php/pab/article/view/15271 |
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/15271/9100 |
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.18, n.5, maio 1983; 499-506 Pesquisa Agropecuária Brasileira; v.18, n.5, maio 1983; 499-506 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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1793416701813981184 |