| |
|
|
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Solos. |
|
Data corrente: |
12/02/2014 |
|
Data da última atualização: |
31/03/2015 |
|
Tipo da produção científica: |
Artigo em Anais de Congresso |
|
Autoria: |
CASTRO, R. C. de; BENITES, V. de M.; TEIXEIRA, P. C.; OLIVEIRA, D. F. de; OLIVEIRA, L. F. de; ANJOS, M. J. dos. |
|
Afiliação: |
Robson C. de Castro, Instituto de Física Armando Dias Tavares; VINICIUS DE MELO BENITES, CNPS; PAULO CESAR TEIXEIRA, CNPS; Davi Ferreira de Oliveira, Instituto de Física Armando Dias Tavares; Luis Fernando de Oliveira, Instituto de Física Armando Dias Tavares; Marcelino José dos Anjos, Instituto de Física Armando Dias Tavares. |
|
Título: |
Analyzing the mobility in granular forms of P fertilizer in brazilians soils under laboratory conditions. |
|
Ano de publicação: |
2013 |
|
Fonte/Imprenta: |
In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE/INAC, 2013. Recife/PE. Anais... Rio de Janeiro, RJ: Associação Brasileira de Energia Nuclear, 2013. |
|
Páginas: |
8p. |
|
Idioma: |
Português |
|
Conteúdo: |
Phosphorus is an essential nutrient for plant growth. Million of tones of P are applied to the soils annually. However, only a small fraction of the P applied with fertilizers is taken up by crops in the year of application, and the effectiveness of any residual P fertilizer declines with time. To improve our understanding of the mechanisms underlying this response to P in the field, we have studied the mobility of P from 3 different fertilizes: monoammonium phosphate (MAP), polymer coated monoammonium phosphate (MAPp) and Organomineral phosphate (OMP) applied on high weathered soil samples in a Petri dish experiment. Total Reflection X-Ray Fluorescence (TXRF) was used to determine the P diffusive flux at different distances (0 - 7.5, 7.5 ? 13.5, 13.5 ? 25.5 and 25.5 ? 43 mm) from granular fertilizer. TXRF analyses were performed at the X-Ray Fluorescence Beamline D09B at Brazilian National Synchrotron Light Laboratory (LNLS), in Campinas, São Paulo, using a polychromatic beam with maximum energy of 20 keV for the excitation and an Ultra-LEGe detector with resolution of 148 eV at 5.9 keV. Besides that, the detections were performed in a high vacuum chamber (2.5 x 10-5 mbar) to avoid air absorption. After a period of five weeks, the total P concentration increased in the soil sampled 7.5 to 13.5 mm from the fertilizer showing a diffusive flux of P. About 20% (considering MAP and MAPp) of the total P applied diffused out of the central soil ring. Different sources showed differences in diffusive flux of P. Soil pH also influenced diffusive flux of P showing higher flux on lower pH soils. MenosPhosphorus is an essential nutrient for plant growth. Million of tones of P are applied to the soils annually. However, only a small fraction of the P applied with fertilizers is taken up by crops in the year of application, and the effectiveness of any residual P fertilizer declines with time. To improve our understanding of the mechanisms underlying this response to P in the field, we have studied the mobility of P from 3 different fertilizes: monoammonium phosphate (MAP), polymer coated monoammonium phosphate (MAPp) and Organomineral phosphate (OMP) applied on high weathered soil samples in a Petri dish experiment. Total Reflection X-Ray Fluorescence (TXRF) was used to determine the P diffusive flux at different distances (0 - 7.5, 7.5 ? 13.5, 13.5 ? 25.5 and 25.5 ? 43 mm) from granular fertilizer. TXRF analyses were performed at the X-Ray Fluorescence Beamline D09B at Brazilian National Synchrotron Light Laboratory (LNLS), in Campinas, São Paulo, using a polychromatic beam with maximum energy of 20 keV for the excitation and an Ultra-LEGe detector with resolution of 148 eV at 5.9 keV. Besides that, the detections were performed in a high vacuum chamber (2.5 x 10-5 mbar) to avoid air absorption. After a period of five weeks, the total P concentration increased in the soil sampled 7.5 to 13.5 mm from the fertilizer showing a diffusive flux of P. About 20% (considering MAP and MAPp) of the total P applied diffused out of the central soil ring. Different sources showed diffe... Mostrar Tudo |
|
Thesaurus Nal: |
phosphorus. |
|
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
|
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/97196/1/ANALYSING.pdf
|
|
Marc: |
LEADER 02309nam a2200193 a 4500
001 1979670
005 2015-03-31
008 2013 bl uuuu u00u1 u #d
100 1 $aCASTRO, R. C. de
245 $aAnalyzing the mobility in granular forms of P fertilizer in brazilians soils under laboratory conditions.$h[electronic resource]
260 $aIn: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE/INAC, 2013. Recife/PE. Anais... Rio de Janeiro, RJ: Associação Brasileira de Energia Nuclear$c2013
300 $a8p.
520 $aPhosphorus is an essential nutrient for plant growth. Million of tones of P are applied to the soils annually. However, only a small fraction of the P applied with fertilizers is taken up by crops in the year of application, and the effectiveness of any residual P fertilizer declines with time. To improve our understanding of the mechanisms underlying this response to P in the field, we have studied the mobility of P from 3 different fertilizes: monoammonium phosphate (MAP), polymer coated monoammonium phosphate (MAPp) and Organomineral phosphate (OMP) applied on high weathered soil samples in a Petri dish experiment. Total Reflection X-Ray Fluorescence (TXRF) was used to determine the P diffusive flux at different distances (0 - 7.5, 7.5 ? 13.5, 13.5 ? 25.5 and 25.5 ? 43 mm) from granular fertilizer. TXRF analyses were performed at the X-Ray Fluorescence Beamline D09B at Brazilian National Synchrotron Light Laboratory (LNLS), in Campinas, São Paulo, using a polychromatic beam with maximum energy of 20 keV for the excitation and an Ultra-LEGe detector with resolution of 148 eV at 5.9 keV. Besides that, the detections were performed in a high vacuum chamber (2.5 x 10-5 mbar) to avoid air absorption. After a period of five weeks, the total P concentration increased in the soil sampled 7.5 to 13.5 mm from the fertilizer showing a diffusive flux of P. About 20% (considering MAP and MAPp) of the total P applied diffused out of the central soil ring. Different sources showed differences in diffusive flux of P. Soil pH also influenced diffusive flux of P showing higher flux on lower pH soils.
650 $aphosphorus
700 1 $aBENITES, V. de M.
700 1 $aTEIXEIRA, P. C.
700 1 $aOLIVEIRA, D. F. de
700 1 $aOLIVEIRA, L. F. de
700 1 $aANJOS, M. J. dos
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Solos (CNPS) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
Registro Completo
|
Biblioteca(s): |
Embrapa Mandioca e Fruticultura; Embrapa Unidades Centrais. |
|
Data corrente: |
08/09/2015 |
|
Data da última atualização: |
09/03/2016 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Circulação/Nível: |
B - 1 |
|
Autoria: |
VENTURINI, M. T.; SANTOS, L. R. dos; OLIVEIRA, E. J. de. |
|
Afiliação: |
MARCELA TONINI VENTURINI, Universidade Federal do Recôncavo da Bahia; LEANDRO RIBEIRO DOS SANTOS, Universidade Federal do Recôncavo da Bahia; EDER JORGE DE OLIVEIRA, CNPMF. |
|
Título: |
Development of a diagrammatic scale for the evaluation of postharvest physiological deterioration in cassava roots. |
|
Ano de publicação: |
2015 |
|
Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, DF., v.50, n.8, p.658-668, ago. 2015. |
|
ISSN: |
0100-204X |
|
DOI: |
10.1590/S0100-204X2015000800004 |
|
Idioma: |
Inglês |
|
Conteúdo: |
The objective of this work was to develop a scale to assess the severity of postharvest physiological deterioration (PPD) of cassava roots, and to validate this scale for accuracy and reproducibility estimates. A diagrammatic scale (0 to 100%) for the damaged roots was analyzed according to precision, accuracy, and reproducibility. Seven evaluators (four with experience and three without it) quantified the PPD severity, with or without the scale, considering 150 roots with different levels of PPD. Without and with the use of the scale, respectively, the inexperienced evaluators obtained coefficients of determination (R2) from 0.76 to 0.86 and 0.87 to 0.92, and the experienced evaluators obtained R2 from 0.90 to 0.96 and 0.96 to 0.97. The values of the intercept (a) obtained by both the experienced and inexperienced evaluators who did not use the scale were all significant, while after using the scale, only two evaluators got values that were not significantly different from one. Evaluation reproducibility between the evaluators ranged from 0.61 to 0.91 for the inexperienced ones and from 0.83 to 0.95 for the experienced ones. The proposed diagrammatic scale was considered appropriate to estimate the severity of PPD in cassava roots, and can be used to identify sources of tolerance to postharvest deterioration. |
|
Palavras-Chave: |
Maninhot esculenta; Physiological processes; Subsistence crop; Tolerance. |
|
Thesagro: |
Mandioca. |
|
Thesaurus NAL: |
Cassava; Shelf life. |
|
Categoria do assunto: |
-- |
|
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/131860/1/Development-of-a-diagrammatic-scale-for-the-evaluation-of-postharvest-physiological-deterioration-in-cassava-roots.pdf
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/129148/1/Development-of-a-diagrammatic.pdf
|
|
Marc: |
LEADER 02114naa a2200253 a 4500
001 2027332
005 2016-03-09
008 2015 bl uuuu u00u1 u #d
022 $a0100-204X
024 7 $a10.1590/S0100-204X2015000800004$2DOI
100 1 $aVENTURINI, M. T.
245 $aDevelopment of a diagrammatic scale for the evaluation of postharvest physiological deterioration in cassava roots.
260 $c2015
520 $aThe objective of this work was to develop a scale to assess the severity of postharvest physiological deterioration (PPD) of cassava roots, and to validate this scale for accuracy and reproducibility estimates. A diagrammatic scale (0 to 100%) for the damaged roots was analyzed according to precision, accuracy, and reproducibility. Seven evaluators (four with experience and three without it) quantified the PPD severity, with or without the scale, considering 150 roots with different levels of PPD. Without and with the use of the scale, respectively, the inexperienced evaluators obtained coefficients of determination (R2) from 0.76 to 0.86 and 0.87 to 0.92, and the experienced evaluators obtained R2 from 0.90 to 0.96 and 0.96 to 0.97. The values of the intercept (a) obtained by both the experienced and inexperienced evaluators who did not use the scale were all significant, while after using the scale, only two evaluators got values that were not significantly different from one. Evaluation reproducibility between the evaluators ranged from 0.61 to 0.91 for the inexperienced ones and from 0.83 to 0.95 for the experienced ones. The proposed diagrammatic scale was considered appropriate to estimate the severity of PPD in cassava roots, and can be used to identify sources of tolerance to postharvest deterioration.
650 $aCassava
650 $aShelf life
650 $aMandioca
653 $aManinhot esculenta
653 $aPhysiological processes
653 $aSubsistence crop
653 $aTolerance
700 1 $aSANTOS, L. R. dos
700 1 $aOLIVEIRA, E. J. de
773 $tPesquisa Agropecuária Brasileira, Brasília, DF.$gv.50, n.8, p.658-668, ago. 2015.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Mandioca e Fruticultura (CNPMF) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
