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Registro Completo |
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
22/11/2002 |
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Data da última atualização: |
22/11/2002 |
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Autoria: |
MACHADO, P. L. O. de A. |
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Afiliação: |
EMBRAPA-CNPS, Rio de Janeiro, RJ. |
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Título: |
Einfluss von humus und basischen kationen auf die aluminium-toxizitat bei ausgewahlten landwirtschaftlichen kulturpflanzen. [Influence of the soil organic matter and basic cations on the aluminium-toxicity to some selected crop plants]. |
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Ano de publicação: |
1993 |
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Fonte/Imprenta: |
Wien : Universitat fur Bodenkultur Wien, 1993. |
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Páginas: |
100p. |
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Idioma: |
Alemão |
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Notas: |
Tese Doutorado. Contem resumo e titulo em ingles: Influence of the soil organic matter and basic cations on the aluminium-toxicity to some selected crop plants. |
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Conteúdo: |
Soil acidity is a process which leads to leaching of important plant mineral nutrients from de root zone. Paralell to nutrient deficiency there is an increase of Al- concentration in the soil solution restricting crop growth. In spite of the fact that liming acid soils is often not feasible, it is still considered to be an efficient measure. hence, aluminium- tolerant plants seem to be a propitius solution to soil Al- toxicity. Improvement of the soil humus status could be a further alternative for long-term neutralization of Al- toxicity. This is of utmost importance considering the fact that the quality and quantity of the soil organic matter can locally be improved through crop rotation and green manuring. In order to identify basic influences of organic matter on Al- toxicity to maize a sand culture experiment was conducted with four Al- treatments (0, 25, 50 and 75 mg Al/L) combined with four levels of peat mixed to the sand (0.0, 0.5, 1.5, and 3.0% peat). Increasing Al- concentrations in the nutrient solution in most cases resulted in a significant growth reduction of shoots and roots. Peat treatments clearly diminished these Al- toxicity effects. Al- concentrations in shoots were hardly influenced by various treatments. Al- contents in maize roots were augmented more than tenfolds with increasing Al- concentration of the nutrient solution in peat free treatments. MenosSoil acidity is a process which leads to leaching of important plant mineral nutrients from de root zone. Paralell to nutrient deficiency there is an increase of Al- concentration in the soil solution restricting crop growth. In spite of the fact that liming acid soils is often not feasible, it is still considered to be an efficient measure. hence, aluminium- tolerant plants seem to be a propitius solution to soil Al- toxicity. Improvement of the soil humus status could be a further alternative for long-term neutralization of Al- toxicity. This is of utmost importance considering the fact that the quality and quantity of the soil organic matter can locally be improved through crop rotation and green manuring. In order to identify basic influences of organic matter on Al- toxicity to maize a sand culture experiment was conducted with four Al- treatments (0, 25, 50 and 75 mg Al/L) combined with four levels of peat mixed to the sand (0.0, 0.5, 1.5, and 3.0% peat). Increasing Al- concentrations in the nutrient solution in most cases resulted in a significant growth reduction of shoots and roots. Peat treatments clearly diminished these Al- toxicity effects. Al- concentrations in shoots were hardly influenced by various treatments. Al- contents in maize roots were augmented more than tenfolds with increasing Al- concentration of the nutrient... Mostrar Tudo |
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Categoria do assunto: |
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Marc: |
LEADER 02227nam a2200133 a 4500
001 1330441
005 2002-11-22
008 1993 bl uuuu m 00u1 u #d
100 1 $aMACHADO, P. L. O. de A.
245 $aEinfluss von humus und basischen kationen auf die aluminium-toxizitat bei ausgewahlten landwirtschaftlichen kulturpflanzen. [Influence of the soil organic matter and basic cations on the aluminium-toxicity to some selected crop plants].
260 $aWien : Universitat fur Bodenkultur Wien$c1993
300 $a100p.
500 $aTese Doutorado. Contem resumo e titulo em ingles: Influence of the soil organic matter and basic cations on the aluminium-toxicity to some selected crop plants.
520 $aSoil acidity is a process which leads to leaching of important plant mineral nutrients from de root zone. Paralell to nutrient deficiency there is an increase of Al- concentration in the soil solution restricting crop growth. In spite of the fact that liming acid soils is often not feasible, it is still considered to be an efficient measure. hence, aluminium- tolerant plants seem to be a propitius solution to soil Al- toxicity. Improvement of the soil humus status could be a further alternative for long-term neutralization of Al- toxicity. This is of utmost importance considering the fact that the quality and quantity of the soil organic matter can locally be improved through crop rotation and green manuring. In order to identify basic influences of organic matter on Al- toxicity to maize a sand culture experiment was conducted with four Al- treatments (0, 25, 50 and 75 mg Al/L) combined with four levels of peat mixed to the sand (0.0, 0.5, 1.5, and 3.0% peat). Increasing Al- concentrations in the nutrient solution in most cases resulted in a significant growth reduction of shoots and roots. Peat treatments clearly diminished these Al- toxicity effects. Al- concentrations in shoots were hardly influenced by various treatments. Al- contents in maize roots were augmented more than tenfolds with increasing Al- concentration of the nutrient solution in peat free treatments.
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Registro original: |
Embrapa Solos (CNPS) |
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Registro Completo
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
29/03/1999 |
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Data da última atualização: |
18/06/2019 |
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Autoria: |
COELHO, E. F.; OR, D. |
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Afiliação: |
EUGENIO FERREIRA COELHO, CNPMF; DANI OR, Utah State University. |
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Título: |
Modelo de distribuição de água e de potencial matricial no solo sob gotejamento com extração de agua por raízes. |
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Ano de publicação: |
1999 |
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Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, DF, v. 34, n. 2, p. 225-34, fev. 1999 |
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Idioma: |
Português |
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Notas: |
Título em inglês: A model for soil water and matric potential distribution under drip irrigation with water extraction by roots. |
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Conteúdo: |
A maior dificuldade em descrever e estimar a distribuicao de agua no bulbo molhado sob gotejamento reside na extracao de agua pelo sistema radicular, que e mais complexa devido a geometria de fluxo tridimensional. Os modelos existentes sao, na maioria, unidimensionais ou multidimensionais de acessibilidade limitada. Este trabalho propoe um modelo semi-analitico para distribuicao bidimensional de umidade ou de potencial no bulbo molhado, atraves da superposicao da solucao analitica de Warrick, para ponto-forte em condicoes de regime nao-permanente, com um modelo parametrico de extracao de agua pelas raizes, considerando o balanco de agua num volume unitario do solo. O modelo foi ajustado com sucesso a dados experimentais para a cultura do milho num solo franco-siltoso. Simulacoes de distribuicao de agua no bulbo molhado mostraram que o modelo permite estimar ou descrever a dinamica de agua do solo no bulbo molhado em qualquer tempo ao longo do ciclo de irrigacao, o que pode contribuir significativamente na avaliacao do manejo da irrigacao, no estudo de posicionamento de sensores de umidade ou de potencial matricial, e em estudos relacionados a atividade das raizes no bulbo molhado. |
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Palavras-Chave: |
Absorcao de agua por raizes; Drip irrigation; Root water uptake; Simulation; Soil-water relationship. |
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Thesagro: |
Irrigação por Gotejamento; Relação Solo-Água; Simulação. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/AI-SEDE/9887/1/pab283_96.pdf
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Marc: |
LEADER 02080naa a2200241 a 4500
001 1093847
005 2019-06-18
008 1999 bl uuuu u00u1 u #d
100 1 $aCOELHO, E. F.
245 $aModelo de distribuição de água e de potencial matricial no solo sob gotejamento com extração de agua por raízes.
260 $c1999
500 $aTítulo em inglês: A model for soil water and matric potential distribution under drip irrigation with water extraction by roots.
520 $aA maior dificuldade em descrever e estimar a distribuicao de agua no bulbo molhado sob gotejamento reside na extracao de agua pelo sistema radicular, que e mais complexa devido a geometria de fluxo tridimensional. Os modelos existentes sao, na maioria, unidimensionais ou multidimensionais de acessibilidade limitada. Este trabalho propoe um modelo semi-analitico para distribuicao bidimensional de umidade ou de potencial no bulbo molhado, atraves da superposicao da solucao analitica de Warrick, para ponto-forte em condicoes de regime nao-permanente, com um modelo parametrico de extracao de agua pelas raizes, considerando o balanco de agua num volume unitario do solo. O modelo foi ajustado com sucesso a dados experimentais para a cultura do milho num solo franco-siltoso. Simulacoes de distribuicao de agua no bulbo molhado mostraram que o modelo permite estimar ou descrever a dinamica de agua do solo no bulbo molhado em qualquer tempo ao longo do ciclo de irrigacao, o que pode contribuir significativamente na avaliacao do manejo da irrigacao, no estudo de posicionamento de sensores de umidade ou de potencial matricial, e em estudos relacionados a atividade das raizes no bulbo molhado.
650 $aIrrigação por Gotejamento
650 $aRelação Solo-Água
650 $aSimulação
653 $aAbsorcao de agua por raizes
653 $aDrip irrigation
653 $aRoot water uptake
653 $aSimulation
653 $aSoil-water relationship
700 1 $aOR, D.
773 $tPesquisa Agropecuária Brasileira, Brasília, DF$gv. 34, n. 2, p. 225-34, fev. 1999
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