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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
18/09/1996 |
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Data da última atualização: |
18/09/1996 |
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Autoria: |
VIERA-VARGAS, M. S.; OLIVEIRA, O. C. de; SOUTO, C. M.; CADISCH, G.; URQUIAGA, S.; BODDEY, R. M. |
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Título: |
Use of different 15N labelling techniques to quantify the contribution of biological N2 fixation to legumes. |
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Ano de publicação: |
1995 |
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Fonte/Imprenta: |
Soil Biology and Biochemistry, Oxford, v. 27, n. 9, p. 1185-1192, 1995. |
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Idioma: |
Inglês |
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Conteúdo: |
The reliable quantification of the contribution of biological N2 fixation (BNF) is an important priority in studies of the N cycle in low-external input farming systems of the tropics where plant-associated BNF if often the largest N input. We have investigated the effect of using more than one control crop, together with different techniques for labelling the soil with 15N, for the application of the isotope dilution technique to quantify the BNF contribution to a forage legume (Centrosema) and French beans (Phaseolus vulgaris). When soil was amended with 15N-labelled organic matter, the 15N enrichment of the soil mineral N decreased slowly with time but when frequent multiple additions of 15N-labelled (NH4)2SO4 were used the 15N enrichment of this N increased with time. Despite this different behaviour of soil 15N enrichment there were no significant differences between 15N treatments in the estimates of the plant N derived from BNF (% Ndfa) of the Centrosema calculated using either of the two non-N2-fixing control crops. This was attributed to the very high %Ndfa of this legume (>84%), a situation where differences in N uptake patterns between control crops are of little importance. In contrast, in the second experiment, the estimates of %Ndfa of P. vulgaris varied from 33 to 62% depending on which 15N addition treatment or control crop was employed. The two estimates derived from the use of non-nodulating bean as control in the different 15N treatments gave a good agreement, which indicated that... MenosThe reliable quantification of the contribution of biological N2 fixation (BNF) is an important priority in studies of the N cycle in low-external input farming systems of the tropics where plant-associated BNF if often the largest N input. We have investigated the effect of using more than one control crop, together with different techniques for labelling the soil with 15N, for the application of the isotope dilution technique to quantify the BNF contribution to a forage legume (Centrosema) and French beans (Phaseolus vulgaris). When soil was amended with 15N-labelled organic matter, the 15N enrichment of the soil mineral N decreased slowly with time but when frequent multiple additions of 15N-labelled (NH4)2SO4 were used the 15N enrichment of this N increased with time. Despite this different behaviour of soil 15N enrichment there were no significant differences between 15N treatments in the estimates of the plant N derived from BNF (% Ndfa) of the Centrosema calculated using either of the two non-N2-fixing control crops. This was attributed to the very high %Ndfa of this legume (>84%), a situation where differences in N uptake patterns between control crops are of little importance. In contrast, in the second experiment, the estimates of %Ndfa of P. vulgaris varied from 33 to 62% depending on which 15N addition treatment or control crop was employed. The two estimates derived from the use of non-nodulating bean as control in the different 15N treatments gave a good agre... Mostrar Tudo |
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Palavras-Chave: |
BNF; FBN; Fixação biologica de nitrogênio; Planta leguminosa. |
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Thesagro: |
Centrosema; Feijão; Phaseolus Vulgaris. |
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Thesaurus Nal: |
kidney beans; legumes; nitrogen fixation. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02389naa a2200301 a 4500
001 1620883
005 1996-09-18
008 1995 bl uuuu u00u1 u #d
100 1 $aVIERA-VARGAS, M. S.
245 $aUse of different 15N labelling techniques to quantify the contribution of biological N2 fixation to legumes.
260 $c1995
520 $aThe reliable quantification of the contribution of biological N2 fixation (BNF) is an important priority in studies of the N cycle in low-external input farming systems of the tropics where plant-associated BNF if often the largest N input. We have investigated the effect of using more than one control crop, together with different techniques for labelling the soil with 15N, for the application of the isotope dilution technique to quantify the BNF contribution to a forage legume (Centrosema) and French beans (Phaseolus vulgaris). When soil was amended with 15N-labelled organic matter, the 15N enrichment of the soil mineral N decreased slowly with time but when frequent multiple additions of 15N-labelled (NH4)2SO4 were used the 15N enrichment of this N increased with time. Despite this different behaviour of soil 15N enrichment there were no significant differences between 15N treatments in the estimates of the plant N derived from BNF (% Ndfa) of the Centrosema calculated using either of the two non-N2-fixing control crops. This was attributed to the very high %Ndfa of this legume (>84%), a situation where differences in N uptake patterns between control crops are of little importance. In contrast, in the second experiment, the estimates of %Ndfa of P. vulgaris varied from 33 to 62% depending on which 15N addition treatment or control crop was employed. The two estimates derived from the use of non-nodulating bean as control in the different 15N treatments gave a good agreement, which indicated that...
650 $akidney beans
650 $alegumes
650 $anitrogen fixation
650 $aCentrosema
650 $aFeijão
650 $aPhaseolus Vulgaris
653 $aBNF
653 $aFBN
653 $aFixação biologica de nitrogênio
653 $aPlanta leguminosa
700 1 $aOLIVEIRA, O. C. de
700 1 $aSOUTO, C. M.
700 1 $aCADISCH, G.
700 1 $aURQUIAGA, S.
700 1 $aBODDEY, R. M.
773 $tSoil Biology and Biochemistry, Oxford$gv. 27, n. 9, p. 1185-1192, 1995.
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
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Registro Completo
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Biblioteca(s): |
Embrapa Amapá. |
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Data corrente: |
07/02/2012 |
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Data da última atualização: |
19/10/2022 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
PANTOJA, W. M. F.; TAVARES-DIAS, M.; PINHEIRO, D. A.; MARINHO, R. G. B.; MONTAGNER, D.; NEVES, L. R. |
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Afiliação: |
W. M. F. PANTOJA; MARCOS TAVARES DIAS, CPAF-AP; D. A. PINHEIRO; R. G. B. MARINHO; DANIEL MONTAGNER, CPAF-AP; L. R. NEVES. |
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Título: |
Fauna parasitária de tilapia-do-nilo de quatro pisciculturas de Macapá, Estado do Amapá. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE ENGENHARIA DE PESCA, 17., 2011, Belém, PA. Engenharia de pesca: construindo o desenvolvimento sustentável do setor pesqueiro nacional: [anais]. Belém, PA: AEP: FAEP, 2011. |
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Idioma: |
Português |
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Palavras-Chave: |
Cultivo. |
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Thesagro: |
Parasito; Peixe de água doce. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/53538/1/AP-2011-Fauna-parasitaria-tilapia.pdf
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Marc: |
LEADER 00748nam a2200193 a 4500
001 1914551
005 2022-10-19
008 2011 bl uuuu u00u1 u #d
100 1 $aPANTOJA, W. M. F.
245 $aFauna parasitária de tilapia-do-nilo de quatro pisciculturas de Macapá, Estado do Amapá.$h[electronic resource]
260 $aIn: CONGRESSO BRASILEIRO DE ENGENHARIA DE PESCA, 17., 2011, Belém, PA. Engenharia de pesca: construindo o desenvolvimento sustentável do setor pesqueiro nacional: [anais]. Belém, PA: AEP: FAEP$c2011
650 $aParasito
650 $aPeixe de água doce
653 $aCultivo
700 1 $aTAVARES-DIAS, M.
700 1 $aPINHEIRO, D. A.
700 1 $aMARINHO, R. G. B.
700 1 $aMONTAGNER, D.
700 1 $aNEVES, L. R.
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Embrapa Amapá (CPAF-AP) |
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