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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
05/06/2000 |
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Data da última atualização: |
05/06/2000 |
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Autoria: |
JONES, D. L. |
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Título: |
Amino acid biodegradation and its potential effects on organic nitrogen capture by plants. |
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Ano de publicação: |
1999 |
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Fonte/Imprenta: |
Soil Biology and Biochemistry, Oxford, v. 31, p. 613-622, 1999. |
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Idioma: |
Inglês |
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Conteúdo: |
It has been reported that plant roots can directly utilise soil organic-N in the form of amino acids without prior mineralisation by the soil's microbial biomass. To critically assess this, however, requires a knowledge of microbial amino acid-N turnover times in soil. The effects of soil type, depth and temperature on the uptake and partitioning of a mixture of 15 14C-labelled amino acids by the soil's microbial biomass was therefore studied in 10 contrasting soil types. The results indicated that the degradation of amino acids was soil dependent but that the mean half-life in topsoils at 18 graus centigrafos was 1.7 mais ou menos 0.6 h, whilst in subsoils the mean half-life was 12.2 mais ou menos 3.3 h. On average 34% of the amino acid-C was respired as CO2 whilst 66% was utilised for new cell biomass. Amino acid decomposition increased with soil temperature, however, rapid rates of amino acid uptake and assimilation were also observed at 5 graus centigrafos (mean half-life in topsoil = 2.9 mais ou menos 1.5h). Little correlation was observed between amino acid half-life and either microbial yield, soil arginase activity or organic matter content (r2 menor 0.40), however, decomposition did appear to be weakly related with soil respiration. The high concentration of amino acids used here (5 mM) was intended to simulate amino acid release after root cell lysis. For previously reported lower concentrations in the bulk soil solution, half lives can be predicted to be even less based on microbial amino acid transport kinetics. The significance of this previously overlooked microbial decomposition of amino acids in the utilisation of organic N by plants is discussed. MenosIt has been reported that plant roots can directly utilise soil organic-N in the form of amino acids without prior mineralisation by the soil's microbial biomass. To critically assess this, however, requires a knowledge of microbial amino acid-N turnover times in soil. The effects of soil type, depth and temperature on the uptake and partitioning of a mixture of 15 14C-labelled amino acids by the soil's microbial biomass was therefore studied in 10 contrasting soil types. The results indicated that the degradation of amino acids was soil dependent but that the mean half-life in topsoils at 18 graus centigrafos was 1.7 mais ou menos 0.6 h, whilst in subsoils the mean half-life was 12.2 mais ou menos 3.3 h. On average 34% of the amino acid-C was respired as CO2 whilst 66% was utilised for new cell biomass. Amino acid decomposition increased with soil temperature, however, rapid rates of amino acid uptake and assimilation were also observed at 5 graus centigrafos (mean half-life in topsoil = 2.9 mais ou menos 1.5h). Little correlation was observed between amino acid half-life and either microbial yield, soil arginase activity or organic matter content (r2 menor 0.40), however, decomposition did appear to be weakly related with soil respiration. The high concentration of amino acids used here (5 mM) was intended to simulate amino acid release after root cell lysis. For previously reported lower concentrations in the bulk soil solution, half lives can be predicted to be even less... Mostrar Tudo |
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Palavras-Chave: |
Biomassa microbiana; Decomposition. |
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Thesagro: |
Aminoácido; Biodegradação; Decomposição; Matéria Orgânica; Solo; Temperatura. |
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Thesaurus Nal: |
amino acids; biodegradation; degradation; microbial biomass; organic matter; soil; temperature. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02509naa a2200301 a 4500
001 1621168
005 2000-06-05
008 1999 bl --- 0-- u #d
100 1 $aJONES, D. L.
245 $aAmino acid biodegradation and its potential effects on organic nitrogen capture by plants.
260 $c1999
520 $aIt has been reported that plant roots can directly utilise soil organic-N in the form of amino acids without prior mineralisation by the soil's microbial biomass. To critically assess this, however, requires a knowledge of microbial amino acid-N turnover times in soil. The effects of soil type, depth and temperature on the uptake and partitioning of a mixture of 15 14C-labelled amino acids by the soil's microbial biomass was therefore studied in 10 contrasting soil types. The results indicated that the degradation of amino acids was soil dependent but that the mean half-life in topsoils at 18 graus centigrafos was 1.7 mais ou menos 0.6 h, whilst in subsoils the mean half-life was 12.2 mais ou menos 3.3 h. On average 34% of the amino acid-C was respired as CO2 whilst 66% was utilised for new cell biomass. Amino acid decomposition increased with soil temperature, however, rapid rates of amino acid uptake and assimilation were also observed at 5 graus centigrafos (mean half-life in topsoil = 2.9 mais ou menos 1.5h). Little correlation was observed between amino acid half-life and either microbial yield, soil arginase activity or organic matter content (r2 menor 0.40), however, decomposition did appear to be weakly related with soil respiration. The high concentration of amino acids used here (5 mM) was intended to simulate amino acid release after root cell lysis. For previously reported lower concentrations in the bulk soil solution, half lives can be predicted to be even less based on microbial amino acid transport kinetics. The significance of this previously overlooked microbial decomposition of amino acids in the utilisation of organic N by plants is discussed.
650 $aamino acids
650 $abiodegradation
650 $adegradation
650 $amicrobial biomass
650 $aorganic matter
650 $asoil
650 $atemperature
650 $aAminoácido
650 $aBiodegradação
650 $aDecomposição
650 $aMatéria Orgânica
650 $aSolo
650 $aTemperatura
653 $aBiomassa microbiana
653 $aDecomposition
773 $tSoil Biology and Biochemistry, Oxford$gv. 31, p. 613-622, 1999.
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
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Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Agropecuária Oeste. |
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Data corrente: |
11/06/2014 |
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Data da última atualização: |
18/12/2014 |
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Tipo da produção científica: |
Documentos |
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Autoria: |
PADOVAN, M. P.; PEZARICO, C. R.; OTSUBO, A. A. (ed.). |
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Afiliação: |
MILTON PARRON PADOVAN, CPAO; CARMEN REGINA PEZARICO, CPAO; AURO AKIO OTSUBO, CPAO. |
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Título: |
Tecnologias para a agricultura familiar. |
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Ano de publicação: |
2014 |
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Fonte/Imprenta: |
Dourados: Embrapa Agropecuária Oeste, 2014. |
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Páginas: |
98 p. |
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Série: |
(Embrapa Agropecuária Oeste. Documentos, 122). |
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Idioma: |
Português |
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Conteúdo: |
Integração Lavoura-Pecuária-Floresta (iLPF); Preparo e seleção de material de plantio de mandioca; Diversificação da produção e segurança alimentar; Manejo da cultura da goiabeira: práticas culturais; Adubação verde - opções para outono/inverno, primavera/verão e espécies perenes; Planejamento alimentar na bovinocultura leiteira; Cultivares de feijão; Fixação biológica de nitrogênio: uso de inoculante no feijoeiro; Milhos especiais da Embrapa ? variedades e multiplicação para a agricultura familiar; Opções para diversificação na segunda safra; Integração Lavoura-Pecuária; Consórcio milho-braquiária; Sistemas agroflorestais em bases agroecológicas; Adubação verde e plantio direto em sistemas de base agroecológica; Aproveitamento de materiais orgânicos e produção de húmus; Compostagem; Produção de mudas de videira; Baculovirus erinnyis para o controle biológico do Mandarová da mandioca. |
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Palavras-Chave: |
Baculovirus erinnyis; Family farming; Fixação nitrogênio; ILPF; Integração lavoura pecuária floresta; Integração lavoura-pecuária-floresta; Sistemas agroflorestais. |
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Thesagro: |
Adubação verde; Agricultura familiar; Compostagem; Consorciação de cultura; Desenvolvimento rural; Feijão; Goiaba; Mandarová; Mandioca; Matéria orgânica; Milho; Phaseolus vulgaris; Plantio direto; Segurança Alimentar; Tecnologia. |
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Thesaurus NAL: |
family farms; technology. |
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Categoria do assunto: |
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A Sistemas de Cultivo
B Sociologia Rural
X Pesquisa, Tecnologia e Engenharia |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/103482/1/DOC2014122.pdf
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Marc: |
LEADER 02176nam a2200445 a 4500
001 1988186
005 2014-12-18
008 2014 bl uuuu 00u1 u #d
100 1 $aPADOVAN, M. P.
245 $aTecnologias para a agricultura familiar.
260 $aDourados: Embrapa Agropecuária Oeste$c2014
300 $a98 p.
490 $a(Embrapa Agropecuária Oeste. Documentos, 122).
520 $aIntegração Lavoura-Pecuária-Floresta (iLPF); Preparo e seleção de material de plantio de mandioca; Diversificação da produção e segurança alimentar; Manejo da cultura da goiabeira: práticas culturais; Adubação verde - opções para outono/inverno, primavera/verão e espécies perenes; Planejamento alimentar na bovinocultura leiteira; Cultivares de feijão; Fixação biológica de nitrogênio: uso de inoculante no feijoeiro; Milhos especiais da Embrapa ? variedades e multiplicação para a agricultura familiar; Opções para diversificação na segunda safra; Integração Lavoura-Pecuária; Consórcio milho-braquiária; Sistemas agroflorestais em bases agroecológicas; Adubação verde e plantio direto em sistemas de base agroecológica; Aproveitamento de materiais orgânicos e produção de húmus; Compostagem; Produção de mudas de videira; Baculovirus erinnyis para o controle biológico do Mandarová da mandioca.
650 $afamily farms
650 $atechnology
650 $aAdubação verde
650 $aAgricultura familiar
650 $aCompostagem
650 $aConsorciação de cultura
650 $aDesenvolvimento rural
650 $aFeijão
650 $aGoiaba
650 $aMandarová
650 $aMandioca
650 $aMatéria orgânica
650 $aMilho
650 $aPhaseolus vulgaris
650 $aPlantio direto
650 $aSegurança Alimentar
650 $aTecnologia
653 $aBaculovirus erinnyis
653 $aFamily farming
653 $aFixação nitrogênio
653 $aILPF
653 $aIntegração lavoura pecuária floresta
653 $aIntegração lavoura-pecuária-floresta
653 $aSistemas agroflorestais
700 1 $aPEZARICO, C. R.
700 1 $aOTSUBO, A. A.
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Embrapa Agropecuária Oeste (CPAO) |
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