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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
08/01/2013 |
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Data da última atualização: |
11/01/2013 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
MARCHI, G.; SILVA, V. A.; GUILHERME, L. R. G.; LIMA, J. M.; NOGUEIRA, F. D.; GUIMARÃES, P. T. G. |
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Afiliação: |
GIULIANO MARCHI, CPAC; VLADIMIR ANTÔNIO SILVA, UFLA; LUIZ ROBERTO GUIMARÃES GUILHERME, UFLA; JOSÉ MARIA LIMA, UFLA; FRANCISCO DIAS NOGUEIRA, EPAMIG; PAULO TÁCITO GONTIJO GUIMARÃES, EPAMIG. |
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Título: |
Potassium extractability from soils of brazilian coffee regions. |
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Ano de publicação: |
2012 |
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Fonte/Imprenta: |
Bioscience Journal, Uberlândia, MG, v. 28, n. 6, p. 913-919, nov./dez. 2012. |
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Idioma: |
Inglês |
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Conteúdo: |
Coffee, which is an important commodity for Brazil, is a highly K-demanding crop. Methods for recommending K fertilization to coffee crops in Brazil are based on the amount of exchangeable K. Mineralogical studies estimating K supply capacity from different soil fractions, from medium to long term, were performed in Brazilian soils, but very few studies have been carried out focusing on the use of successive chemical extractions. This study evaluated K release from whole soil, as well as clay, silt, and sand fractions of B-horizon samples of a basalt-derived Oxisol and a sienite-derived Ultisol, both representative soils from coffee regions of Minas Gerais State. Successive extractions (0 to 665 h) of K were performed with 10-3 mol L-1 of either citrate or oxalate at 1:10 solid:solution ratio. The cumulative results were compared with forms of K (exchangeable, non-exchangeable, and total) as measured by different extraction procedures. The results showed that exchangeable K was higher, and non-exchangeable as well as total K were lower in the whole soil fraction of the Oxisol, than the K forms extracted from the Ultisol. The clay fraction was the main source of K in the Oxisol whereas the silt fraction contributed most for K supply in the Ultisol. Citrate and oxalate extracted similar amounts of K from the Oxisol, which is probably related to the fact that most of its K supply came from the exchangeable form. Citrate caused a greater release of K (part of which being from the non-exchangeable form) from the Ultisol than did oxalate. This work showed that soil texture alone is not a good indicator of K supply capacity, since for the same particle size, the studied soils revealed different K extractability. MenosCoffee, which is an important commodity for Brazil, is a highly K-demanding crop. Methods for recommending K fertilization to coffee crops in Brazil are based on the amount of exchangeable K. Mineralogical studies estimating K supply capacity from different soil fractions, from medium to long term, were performed in Brazilian soils, but very few studies have been carried out focusing on the use of successive chemical extractions. This study evaluated K release from whole soil, as well as clay, silt, and sand fractions of B-horizon samples of a basalt-derived Oxisol and a sienite-derived Ultisol, both representative soils from coffee regions of Minas Gerais State. Successive extractions (0 to 665 h) of K were performed with 10-3 mol L-1 of either citrate or oxalate at 1:10 solid:solution ratio. The cumulative results were compared with forms of K (exchangeable, non-exchangeable, and total) as measured by different extraction procedures. The results showed that exchangeable K was higher, and non-exchangeable as well as total K were lower in the whole soil fraction of the Oxisol, than the K forms extracted from the Ultisol. The clay fraction was the main source of K in the Oxisol whereas the silt fraction contributed most for K supply in the Ultisol. Citrate and oxalate extracted similar amounts of K from the Oxisol, which is probably related to the fact that most of its K supply came from the exchangeable form. Citrate caused a greater release of K (part of which being from th... Mostrar Tudo |
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Thesagro: |
Café; Solo. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02301naa a2200205 a 4500
001 1944331
005 2013-01-11
008 2012 bl uuuu u00u1 u #d
100 1 $aMARCHI, G.
245 $aPotassium extractability from soils of brazilian coffee regions.
260 $c2012
520 $aCoffee, which is an important commodity for Brazil, is a highly K-demanding crop. Methods for recommending K fertilization to coffee crops in Brazil are based on the amount of exchangeable K. Mineralogical studies estimating K supply capacity from different soil fractions, from medium to long term, were performed in Brazilian soils, but very few studies have been carried out focusing on the use of successive chemical extractions. This study evaluated K release from whole soil, as well as clay, silt, and sand fractions of B-horizon samples of a basalt-derived Oxisol and a sienite-derived Ultisol, both representative soils from coffee regions of Minas Gerais State. Successive extractions (0 to 665 h) of K were performed with 10-3 mol L-1 of either citrate or oxalate at 1:10 solid:solution ratio. The cumulative results were compared with forms of K (exchangeable, non-exchangeable, and total) as measured by different extraction procedures. The results showed that exchangeable K was higher, and non-exchangeable as well as total K were lower in the whole soil fraction of the Oxisol, than the K forms extracted from the Ultisol. The clay fraction was the main source of K in the Oxisol whereas the silt fraction contributed most for K supply in the Ultisol. Citrate and oxalate extracted similar amounts of K from the Oxisol, which is probably related to the fact that most of its K supply came from the exchangeable form. Citrate caused a greater release of K (part of which being from the non-exchangeable form) from the Ultisol than did oxalate. This work showed that soil texture alone is not a good indicator of K supply capacity, since for the same particle size, the studied soils revealed different K extractability.
650 $aCafé
650 $aSolo
700 1 $aSILVA, V. A.
700 1 $aGUILHERME, L. R. G.
700 1 $aLIMA, J. M.
700 1 $aNOGUEIRA, F. D.
700 1 $aGUIMARÃES, P. T. G.
773 $tBioscience Journal, Uberlândia, MG$gv. 28, n. 6, p. 913-919, nov./dez. 2012.
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| 1. |  | OLIVEIRA, L. C.; ISHIDA, A. K. N.; MARINHO, A. M. R.; LACERDA, L.; SILVA, C. B. T. Extratos de Morinda citrifolia e Piper nigrum no controle da mancha bacteriana do maracujazeiro. Tropical Plant Pathology, Brasília, DF, v. 37, ago. 2012. Suplemento, ref. 886. Edição dos Resumos do 45º Congresso Brasileiro de Fitopatologia, Manaus, 2012. CBFito 2012.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 2. | | CAVALCANTE, F. O. R.; SANTOS, J. C. L. dos; SOUZA FILHO, A. P. S.; MARINHO, A. M. R.; RODRIGUES-FILHO, E.; SANTOS, L. S. Atividade alelopática da biomassa produzida pelo fungo endofítico Colletotrichum gloeosporioides. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE QUÍMICA, 29., 2006, Águas de Lindóia. Anais... Águas de Lindóia: Sociedade Brasileira de Química, 2006.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 3. | | CORREA, M. J. C.; MARINHO, P. S. B.; MARINHO, A. M. R.; SANTOS, L. S.; GUILHON, G. M. S. P.; RIBEIRO, W. S.; SOUZA FILHO, A. P. S. Efeito alelopático da flavona tricina sobre plantas invasoras de pastagens. In: REUNIÃO ANUAL SOCIEDADE BRASILEIRA DE QUÍMICA, 33., 2010, Águas de Lindóia. A química construindo um futuro melhor. [São Paulo]: SBQ, 2010.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 4. | | LOPES JUNIOR, M. L.; PACHECO, L. C.; RIPARDO FILHO, H. da S.; ARAÚJO, R. N. M.; SILVA, L. O. da; PAES, S. S.; SILVA, M. N. da; GUILHON, G. M. S. P.; MARINHO, A. M. R.; SOUZA FILHO, A. P. da S.; SANTOS, L. S. Atividade alelopática e metabólitos produzidos pelo fungo endofítico Glomerella cingulata. In: REUNIAO ANUAL DA SOCIEDADE BRASILEIRA DE QUÍMICA, 35., 2012, Águas de Lindóia. Responsabilidade, ética e progresso social: trabalhos. [São Paulo]: SBQ, 2012. 1 CD-ROM.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Amazônia Oriental. |
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| Registros recuperados : 4 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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