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Registro Completo |
Biblioteca(s): |
Embrapa Cerrados; Embrapa Solos. |
Data corrente: |
16/02/1993 |
Data da última atualização: |
16/02/1993 |
Autoria: |
SILVA, J. E. da. |
Título: |
Hydrothermally treated potassium feldspar as a source of potassium to plants. |
Ano de publicação: |
1986 |
Fonte/Imprenta: |
Raleigh: North Carolina State University, 1986. |
Páginas: |
129p. |
Idioma: |
Inglês |
Notas: |
Tese Doutorado. |
Conteúdo: |
The extremely low cation exchange capacity of the Oxisol of the Cerrado region in central Brazil, together with high permeability of the soils and intense rainfall during the growing season, make the system very vulnerable to the leaching of cations, mainly potassium. Many practices have been attempted to improve the management of the nutrient which is mainly applied as a soluble potassium chloride. Liming has proven to be very efficient in reducing leaching, but other alternatives have been researched. Very recently, a product obtained by the alkaline hydrotermal treatment of potassium feldspars was proposed as an alternative source of the nutrient. The material is claimed to have the characteristics of a slow release source, which could make it of considerable value from the point of view of controlling leaching, improving the plant use efficiency of the nutrient, and keeping a more constant level of the nutrient, and keeping a more constant level of the nutrient in the soi due to a longer lasting effect. In addition, it would ease costs of import of potassium chloride since Brazil is still dependent on external acquisition to satisfy its internal demand for the fertilizer. Two samples of the hydrothermally treated material were analyzed and compared with the original potash rock. The alkaline hydrothermal treatment resulted in a crystalline phase not soluble in water, but soluble in two percent citric acid solultion. The rate of potassium relase was very fast in a pH 5.5 buffered citrate-citric...... MenosThe extremely low cation exchange capacity of the Oxisol of the Cerrado region in central Brazil, together with high permeability of the soils and intense rainfall during the growing season, make the system very vulnerable to the leaching of cations, mainly potassium. Many practices have been attempted to improve the management of the nutrient which is mainly applied as a soluble potassium chloride. Liming has proven to be very efficient in reducing leaching, but other alternatives have been researched. Very recently, a product obtained by the alkaline hydrotermal treatment of potassium feldspars was proposed as an alternative source of the nutrient. The material is claimed to have the characteristics of a slow release source, which could make it of considerable value from the point of view of controlling leaching, improving the plant use efficiency of the nutrient, and keeping a more constant level of the nutrient, and keeping a more constant level of the nutrient in the soi due to a longer lasting effect. In addition, it would ease costs of import of potassium chloride since Brazil is still dependent on external acquisition to satisfy its internal demand for the fertilizer. Two samples of the hydrothermally treated material were analyzed and compared with the original potash rock. The alkaline hydrothermal treatment resulted in a crystalline phase not soluble in water, but soluble in two percent citric acid solultion. The rate of potassium relase was very fast in a pH 5.5 ... Mostrar Tudo |
Palavras-Chave: |
Fertilizante potassicoa; Latossolo vermelho-amarelo; Latossolo vermelho-escuro; Phosphate fertilizers. |
Thesagro: |
Adubação; Cerrado; Manejo; Milheto; Pennisetum Typhoides; Potássio; Tratamento Hidrotérmico. |
Thesaurus Nal: |
Ferralsols; millets. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02326nam a2200289 a 4500 001 1548048 005 1993-02-16 008 1986 bl uuuu m 00u1 u #d 100 1 $aSILVA, J. E. da 245 $aHydrothermally treated potassium feldspar as a source of potassium to plants. 260 $aRaleigh: North Carolina State University$c1986 300 $a129p. 500 $aTese Doutorado. 520 $aThe extremely low cation exchange capacity of the Oxisol of the Cerrado region in central Brazil, together with high permeability of the soils and intense rainfall during the growing season, make the system very vulnerable to the leaching of cations, mainly potassium. Many practices have been attempted to improve the management of the nutrient which is mainly applied as a soluble potassium chloride. Liming has proven to be very efficient in reducing leaching, but other alternatives have been researched. Very recently, a product obtained by the alkaline hydrotermal treatment of potassium feldspars was proposed as an alternative source of the nutrient. The material is claimed to have the characteristics of a slow release source, which could make it of considerable value from the point of view of controlling leaching, improving the plant use efficiency of the nutrient, and keeping a more constant level of the nutrient, and keeping a more constant level of the nutrient in the soi due to a longer lasting effect. In addition, it would ease costs of import of potassium chloride since Brazil is still dependent on external acquisition to satisfy its internal demand for the fertilizer. Two samples of the hydrothermally treated material were analyzed and compared with the original potash rock. The alkaline hydrothermal treatment resulted in a crystalline phase not soluble in water, but soluble in two percent citric acid solultion. The rate of potassium relase was very fast in a pH 5.5 buffered citrate-citric...... 650 $aFerralsols 650 $amillets 650 $aAdubação 650 $aCerrado 650 $aManejo 650 $aMilheto 650 $aPennisetum Typhoides 650 $aPotássio 650 $aTratamento Hidrotérmico 653 $aFertilizante potassicoa 653 $aLatossolo vermelho-amarelo 653 $aLatossolo vermelho-escuro 653 $aPhosphate fertilizers
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Registro original: |
Embrapa Cerrados (CPAC) |
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Registro Completo
Biblioteca(s): |
Embrapa Soja. |
Data corrente: |
06/02/2008 |
Data da última atualização: |
06/02/2008 |
Autoria: |
MARQUES, C. R. G.; PANDOLFI, T. J. F.; CARVALHO, C. G. P. de; OLIVEIRA, A. C. B. de. |
Afiliação: |
Camila Renata Gonçalves Marques, CNPSo; Thaís Juliana Freitas Pandolfi, CNPSo; Claudio Guilherme Portela de Carvalho, CNPSo; Ana Cláudia Barneche de Oliveira, CNPSo. |
Título: |
Avaliação e seleção de genótipos de girassol no Rio Grande do Sul na safra 2005/2006. |
Ano de publicação: |
2006 |
Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE PLANTAS OLEAGINOSAS, ÓLEOS, GORDURAS E BIODIESEL, 3., 2006, Varginha, MG. Biodiesel: evolução tecnológica e qualidade: anais. Lavras: UFLA, 2006. |
Descrição Física: |
1 CD-ROM. |
Idioma: |
Português |
Notas: |
pdf.: a06_185 |
Categoria do assunto: |
-- |
Marc: |
LEADER 00645naa a2200169 a 4500 001 1466396 005 2008-02-06 008 2006 bl uuuu u00u1 u #d 100 1 $aMARQUES, C. R. G. 245 $aAvaliação e seleção de genótipos de girassol no Rio Grande do Sul na safra 2005/2006. 260 $c2006 300 $c1 CD-ROM. 500 $apdf.: a06_185 700 1 $aPANDOLFI, T. J. F. 700 1 $aCARVALHO, C. G. P. de 700 1 $aOLIVEIRA, A. C. B. de 773 $tIn: CONGRESSO BRASILEIRO DE PLANTAS OLEAGINOSAS, ÓLEOS, GORDURAS E BIODIESEL, 3., 2006, Varginha, MG. Biodiesel: evolução tecnológica e qualidade: anais. Lavras: UFLA, 2006.
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