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Registro Completo |
Biblioteca(s): |
Embrapa Agroindústria Tropical. |
Data corrente: |
24/07/2001 |
Data da última atualização: |
24/07/2001 |
Autoria: |
ANDRADE, W. E. B.; NASCIMENTO, D.; ALVES, S. M. C.; SILVA, J. S. S.; ARAUJO, J. M.; SANTOS, J. C. |
Título: |
Diagnose nutricional de cafeeiros da regiao serrana fluminense-safra 1998/1999. e 1999/2000 |
Ano de publicação: |
2001 |
Fonte/Imprenta: |
Niteroi: Pesagro-Rio, 2001. |
Páginas: |
5 p. |
Série: |
(Pesagro-Rio. Comunicado Tecnico,) |
ISBN: |
0100896X |
Idioma: |
Português |
Conteúdo: |
A Regiao Serrana Fluminense e a segunda maior produtora de cafe do Estado produzindo 30,93% da producao estadual em 1998. A regiao se caracteriza por apresentar topografia mais acidentada e grande numero de pequenas propriedades rurais, com mao-de-obra familiar propria. Procurando fornercer aos produtores tecnologias racionais para o cultivo do cafe, procurou-se realizar um diagnostico foliar para identificar provaveis deficiencias de macro e micronutrientes na regiao. |
Palavras-Chave: |
Fertilizantes; Producao de cafe. |
Categoria do assunto: |
-- |
Marc: |
LEADER 01112nam a2200229 a 4500 001 1423142 005 2001-07-24 008 2001 bl uuuu u0uu1 u #d 022 $a0100896X 100 1 $aANDRADE, W. E. B. 245 $aDiagnose nutricional de cafeeiros da regiao serrana fluminense-safra 1998/1999. e 1999/2000 260 $aNiteroi: Pesagro-Rio$c2001 300 $a5 p. 490 $a(Pesagro-Rio. Comunicado Tecnico,) 520 $aA Regiao Serrana Fluminense e a segunda maior produtora de cafe do Estado produzindo 30,93% da producao estadual em 1998. A regiao se caracteriza por apresentar topografia mais acidentada e grande numero de pequenas propriedades rurais, com mao-de-obra familiar propria. Procurando fornercer aos produtores tecnologias racionais para o cultivo do cafe, procurou-se realizar um diagnostico foliar para identificar provaveis deficiencias de macro e micronutrientes na regiao. 653 $aFertilizantes 653 $aProducao de cafe 700 1 $aNASCIMENTO, D. 700 1 $aALVES, S. M. C. 700 1 $aSILVA, J. S. S. 700 1 $aARAUJO, J. M. 700 1 $aSANTOS, J. C.
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Embrapa Agroindústria Tropical (CNPAT) |
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Registro Completo
Biblioteca(s): |
Embrapa Solos. |
Data corrente: |
01/08/2022 |
Data da última atualização: |
01/08/2022 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 1 |
Autoria: |
NOVOTNY, E. H.; OLIVEIRA-SILVA, R. de; MATTOS, B. B.; RECH, I.; GALVOSAS, P.; BONAGAMBA, T. J. |
Afiliação: |
ETELVINO HENRIQUE NOVOTNY, CNPS; RODRIGO DE OLIVEIRA-SILVA, USP/KU LEUVEN; BIANCA BRAZ MATTOS, CNPS; IONÁ RECH, USP; PETRIK GALVOSAS, VICTORIA UNIVERSITY WELLINGTON; TITO J. BONAGAMBA, USP. |
Título: |
Study of zeolite anti-caking effects for fertilisers by 1H low-field NMR. |
Ano de publicação: |
2022 |
Fonte/Imprenta: |
Journal of Magnetic Resonance, v. 342, 107264, Sept. 2022. |
DOI: |
https://doi.org/10.1016/j.jmr.2022.107264 |
Idioma: |
Inglês |
Conteúdo: |
Caking is associated with the consolidation of dry powder and granules, leading to losses of function and/or quality. It has been object of studies in the pharmaceutical, food and fertiliser areas since 1920's because of its significant impact on product quality and value. Caking has been described as a three-step event consisting of sorption-dissolution-recrystallisation phases and constitutes a critical factor in fertilisers losses during storage while also hampering fertiliser application. Current methods for the evaluation of water sorption dynamics are expensive, time-consuming and/or inaccurate. This manuscript describes an unprecedented application of low-field 1H NMR relaxometry for the kinetic study of humidity uptake, in real-time, by urea mixed with different concentrations of an anti-caking agent (zeolite). The proposed method allows to follow the water uptake in different domains of the mixed fertiliser/zeolite samples. To our knowledge, this dynamic has not been observed and quantified so far in real-time. Furthermore, we presented the use of 2D-ILT for kinetic studies, being the first dimension the usual transverse relaxation and the second dimension the kinetic one. With this approach, the NMR relaxation times T2 correlated to time constants associated with the uptake kinetics of the water. This method could be extended to several kinetic studies and experiments with temperature variation. Depending on the kinetics of the studied process, the kernel of the Laplace transform must be suitably adapted. MenosCaking is associated with the consolidation of dry powder and granules, leading to losses of function and/or quality. It has been object of studies in the pharmaceutical, food and fertiliser areas since 1920's because of its significant impact on product quality and value. Caking has been described as a three-step event consisting of sorption-dissolution-recrystallisation phases and constitutes a critical factor in fertilisers losses during storage while also hampering fertiliser application. Current methods for the evaluation of water sorption dynamics are expensive, time-consuming and/or inaccurate. This manuscript describes an unprecedented application of low-field 1H NMR relaxometry for the kinetic study of humidity uptake, in real-time, by urea mixed with different concentrations of an anti-caking agent (zeolite). The proposed method allows to follow the water uptake in different domains of the mixed fertiliser/zeolite samples. To our knowledge, this dynamic has not been observed and quantified so far in real-time. Furthermore, we presented the use of 2D-ILT for kinetic studies, being the first dimension the usual transverse relaxation and the second dimension the kinetic one. With this approach, the NMR relaxation times T2 correlated to time constants associated with the uptake kinetics of the water. This method could be extended to several kinetic studies and experiments with temperature variation. Depending on the kinetics of the studied process, the kernel of the La... Mostrar Tudo |
Palavras-Chave: |
1H NMR Relaxometry; Agglomeration; Powder consolidation; TD-NMR. |
Thesaurus NAL: |
Humidity. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
Marc: |
LEADER 02287naa a2200253 a 4500 001 2145062 005 2022-08-01 008 2022 bl uuuu u00u1 u #d 024 7 $ahttps://doi.org/10.1016/j.jmr.2022.107264$2DOI 100 1 $aNOVOTNY, E. H. 245 $aStudy of zeolite anti-caking effects for fertilisers by 1H low-field NMR.$h[electronic resource] 260 $c2022 520 $aCaking is associated with the consolidation of dry powder and granules, leading to losses of function and/or quality. It has been object of studies in the pharmaceutical, food and fertiliser areas since 1920's because of its significant impact on product quality and value. Caking has been described as a three-step event consisting of sorption-dissolution-recrystallisation phases and constitutes a critical factor in fertilisers losses during storage while also hampering fertiliser application. Current methods for the evaluation of water sorption dynamics are expensive, time-consuming and/or inaccurate. This manuscript describes an unprecedented application of low-field 1H NMR relaxometry for the kinetic study of humidity uptake, in real-time, by urea mixed with different concentrations of an anti-caking agent (zeolite). The proposed method allows to follow the water uptake in different domains of the mixed fertiliser/zeolite samples. To our knowledge, this dynamic has not been observed and quantified so far in real-time. Furthermore, we presented the use of 2D-ILT for kinetic studies, being the first dimension the usual transverse relaxation and the second dimension the kinetic one. With this approach, the NMR relaxation times T2 correlated to time constants associated with the uptake kinetics of the water. This method could be extended to several kinetic studies and experiments with temperature variation. Depending on the kinetics of the studied process, the kernel of the Laplace transform must be suitably adapted. 650 $aHumidity 653 $a1H NMR Relaxometry 653 $aAgglomeration 653 $aPowder consolidation 653 $aTD-NMR 700 1 $aOLIVEIRA-SILVA, R. de 700 1 $aMATTOS, B. B. 700 1 $aRECH, I. 700 1 $aGALVOSAS, P. 700 1 $aBONAGAMBA, T. J. 773 $tJournal of Magnetic Resonance$gv. 342, 107264, Sept. 2022.
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