|
|
Registro Completo |
Biblioteca(s): |
Embrapa Cerrados; Embrapa Unidades Centrais. |
Data corrente: |
03/07/1992 |
Data da última atualização: |
12/06/1998 |
Autoria: |
PEREIRA, P. A. A.; ARAUJO, R. S.; ROCHA, R. E. M. da; STEINMETZ, S. |
Afiliação: |
CNPAF. |
Título: |
Capacidade de genotipos de feijoeiro de fixar N2 atmosferico. |
Ano de publicação: |
1984 |
Fonte/Imprenta: |
Pesquisa Agropecuaria Brasileira, Brasilia, v.19, n.7, p. 811-815, jul. 1984. |
Idioma: |
Português |
Conteúdo: |
Foi conduzido em campo, programa de tiragem paa avaliar a potencialidade de diversos genotipos de feijoeiro (Phaseolus vulgaris L.) para fixacao de N2 atmosferico. Observou-se uma ampla variabilidade no peso da materia seca dos nodulos e na atividade da ntrogenase (N2-ase) dos genotipos estudados. A atividade media da nitrogenase (N2-ase) foi maior na floracao do que no enchimento dos graos das plantas de feijao, o que indicou uma senescencia dos nodulos nesta fase fisiologica. Mais de 40% dos genotipos estudados apresentaram uma massa nodular superior a 92,5 mg de peso da materia seca dos nodulos/planta, e alguns alcancaram 200 mg deste peso, podendo ser comparados a massa nodular de outras leguminosas tidas como eficientes na simbiose com bacterias do genotipo Rhizobium. Os genotipos CNF 1855, CNF 1882 e Valle 18 foram os melhores, enquanto CNF 1454, Lustroso Claro, Mulatinho e CNF 402 ficaram entre os piores. |
Palavras-Chave: |
Fixacao; Fixacao de N2; Fixacao Simbiotica; N2 fixation; Variabilidade. |
Thesagro: |
Cerrado; Feijão; Genótipo; Nitrogênio; Nodulação; Phaseolus Vulgaris; Rhizobium. |
Thesaurus Nal: |
nodulation; variability. |
Categoria do assunto: |
-- |
Marc: |
LEADER 01779naa a2200325 a 4500 001 1104765 005 1998-06-12 008 1984 bl uuuu u00u1 u #d 100 1 $aPEREIRA, P. A. A. 245 $aCapacidade de genotipos de feijoeiro de fixar N2 atmosferico. 260 $c1984 520 $aFoi conduzido em campo, programa de tiragem paa avaliar a potencialidade de diversos genotipos de feijoeiro (Phaseolus vulgaris L.) para fixacao de N2 atmosferico. Observou-se uma ampla variabilidade no peso da materia seca dos nodulos e na atividade da ntrogenase (N2-ase) dos genotipos estudados. A atividade media da nitrogenase (N2-ase) foi maior na floracao do que no enchimento dos graos das plantas de feijao, o que indicou uma senescencia dos nodulos nesta fase fisiologica. Mais de 40% dos genotipos estudados apresentaram uma massa nodular superior a 92,5 mg de peso da materia seca dos nodulos/planta, e alguns alcancaram 200 mg deste peso, podendo ser comparados a massa nodular de outras leguminosas tidas como eficientes na simbiose com bacterias do genotipo Rhizobium. Os genotipos CNF 1855, CNF 1882 e Valle 18 foram os melhores, enquanto CNF 1454, Lustroso Claro, Mulatinho e CNF 402 ficaram entre os piores. 650 $anodulation 650 $avariability 650 $aCerrado 650 $aFeijão 650 $aGenótipo 650 $aNitrogênio 650 $aNodulação 650 $aPhaseolus Vulgaris 650 $aRhizobium 653 $aFixacao 653 $aFixacao de N2 653 $aFixacao Simbiotica 653 $aN2 fixation 653 $aVariabilidade 700 1 $aARAUJO, R. S. 700 1 $aROCHA, R. E. M. da 700 1 $aSTEINMETZ, S. 773 $tPesquisa Agropecuaria Brasileira, Brasilia$gv.19, n.7, p. 811-815, jul. 1984.
Download
Esconder MarcMostrar Marc Completo |
Registro original: |
Embrapa Unidades Centrais (AI-SEDE) |
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
| Acesso ao texto completo restrito à biblioteca da Embrapa Amazônia Oriental. Para informações adicionais entre em contato com cpatu.biblioteca@embrapa.br. |
Registro Completo
Biblioteca(s): |
Embrapa Amazônia Oriental; Embrapa Arroz e Feijão. |
Data corrente: |
11/06/2014 |
Data da última atualização: |
19/10/2022 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 1 |
Autoria: |
PERRIN, A.-S.; FUJISAKI, K.; PETITJEAN, C.; SARRAZIN, M.; GODET, M.; GARRIC, B.; HORTH, J.-C.; BALBINO, L. C.; SILVEIRA FILHO, A.; MACHADO, P. L. O. de A.; BROSSARD, M. |
Afiliação: |
Anne-Sophie Perrin, CETIOM / EPLEFPA; Kenji Fujisaki, CETIOM / EPLEFPA / IRD - UMR 210 Eco&Sols; Caroline Petitjean, Université des Antilles et de la Guyane; Max Sarrazin, IRD - US122; Mathieu Godet, CETIOM / EPLEFPA; Bernard Garric, CETIOM / EPLEFPA; Jean-Claude Horth, CETIOM / EPLEFPA / Chambre d'Agriculture de Guyane; LUIZ CARLOS BALBINO, CPAC; AUSTRELINO SILVEIRA FILHO, CPATU; PEDRO LUIZ OLIVEIRA DE A MACHADO, CNPAF; Michel Brossard, IRD - UMR 210 Eco&Sols. |
Título: |
Conversion of forest to agriculture in Amazonia with the chop-and-mulch method: Does it improve the soil carbon stock? |
Ano de publicação: |
2014 |
Fonte/Imprenta: |
Agriculture, Ecosystems & Environment, v. 184, p. 101-114, Feb. 2014. |
DOI: |
10.1016/j.agee.2013.11.009 |
Idioma: |
Inglês |
Conteúdo: |
Fire-free forest conversion with organic inputs as an alternative to slash-and-burn could improve agro-ecosystem sustainability. We assessed soil carbon mass changes in a sandy-clayey and well-drained soil in French Guiana after forest clearing by the chop-and-mulch method and crop establishment. At the experimental site of Combi, native forest was cut down in October 2008; woody biomass was chopped and incorporated into the top 20 cm of soil. After about one year of legume and grass cover, three forms of land management were compared: grassland (Urochloa ruziziensis), maize/soybean crop rotation with disk tillage and in direct seeding without tillage. There were four replicates. We measured 14.16 kg m-2 of carbon in 2 mm-sieved soil down to 2 m depth for the initial forest. Forest clearing did not induce significant soil compaction; neither did any specific agricultural practice. In converted soils, C stocks were measured in the 0-30 cm layer after each crop for three years. Carbon mass changes for soil fractions <2 mm (soil C stock) and >2 mm (soil C pool) in the 0-5, 5-10, 10-20 and 20-30 cm soil layers were assessed on an equivalent soil mass basis. One year and 1.5 years after deforestation, higher C stocks (+0.64 to 1.16 kg C m-2 yr-1) and C pools (+0.52 to 0.90 kg C m-2 yr-1) were measured in converted soils, compared to those of the forest into the top 30 cm of soil. However, the masses of carbon in these converted soils declined later. The highest rates of carbon decrease were measured between 1.5 and 2 years after forest conversion in the <2 mm soil fraction, from 0.46 kg C m-2 yr-1 (in grassland soils) to 0.71 kg C m-2 yr-1 (in cropland under no tillage). The carbon pool declined during the third year at rates of 0.41 kg C m-2 yr-1 (cropland under disk tillage) to 0.76 kg C m-2 yr-1 (grassland soils). Three years after forest conversion, C masses in the top 30 cm of soils for grassland showed similar values than for forest. In comparison, the carbon stock in cropped soils managed under no tillage in direct seeding (without mulch) was significantly 17% and 16% lower than in forest and grassland soils, respectively. None of the studied agricultural practices succeeded in accumulating carbon from the chopped forest biomass. MenosFire-free forest conversion with organic inputs as an alternative to slash-and-burn could improve agro-ecosystem sustainability. We assessed soil carbon mass changes in a sandy-clayey and well-drained soil in French Guiana after forest clearing by the chop-and-mulch method and crop establishment. At the experimental site of Combi, native forest was cut down in October 2008; woody biomass was chopped and incorporated into the top 20 cm of soil. After about one year of legume and grass cover, three forms of land management were compared: grassland (Urochloa ruziziensis), maize/soybean crop rotation with disk tillage and in direct seeding without tillage. There were four replicates. We measured 14.16 kg m-2 of carbon in 2 mm-sieved soil down to 2 m depth for the initial forest. Forest clearing did not induce significant soil compaction; neither did any specific agricultural practice. In converted soils, C stocks were measured in the 0-30 cm layer after each crop for three years. Carbon mass changes for soil fractions <2 mm (soil C stock) and >2 mm (soil C pool) in the 0-5, 5-10, 10-20 and 20-30 cm soil layers were assessed on an equivalent soil mass basis. One year and 1.5 years after deforestation, higher C stocks (+0.64 to 1.16 kg C m-2 yr-1) and C pools (+0.52 to 0.90 kg C m-2 yr-1) were measured in converted soils, compared to those of the forest into the top 30 cm of soil. However, the masses of carbon in these converted soils declined later. The highest rates of carbon de... Mostrar Tudo |
Palavras-Chave: |
Guiana Francesa; Sem queima. |
Thesagro: |
Agricultura; Brachiaria; Carbono; Desmatamento; Plantio direto; Solo. |
Thesaurus NAL: |
Amazonia. |
Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal P Recursos Naturais, Ciências Ambientais e da Terra |
Marc: |
LEADER 03285naa a2200361 a 4500 001 1988251 005 2022-10-19 008 2014 bl uuuu u00u1 u #d 024 7 $a10.1016/j.agee.2013.11.009$2DOI 100 1 $aPERRIN, A.-S. 245 $aConversion of forest to agriculture in Amazonia with the chop-and-mulch method$bDoes it improve the soil carbon stock? 260 $c2014 520 $aFire-free forest conversion with organic inputs as an alternative to slash-and-burn could improve agro-ecosystem sustainability. We assessed soil carbon mass changes in a sandy-clayey and well-drained soil in French Guiana after forest clearing by the chop-and-mulch method and crop establishment. At the experimental site of Combi, native forest was cut down in October 2008; woody biomass was chopped and incorporated into the top 20 cm of soil. After about one year of legume and grass cover, three forms of land management were compared: grassland (Urochloa ruziziensis), maize/soybean crop rotation with disk tillage and in direct seeding without tillage. There were four replicates. We measured 14.16 kg m-2 of carbon in 2 mm-sieved soil down to 2 m depth for the initial forest. Forest clearing did not induce significant soil compaction; neither did any specific agricultural practice. In converted soils, C stocks were measured in the 0-30 cm layer after each crop for three years. Carbon mass changes for soil fractions <2 mm (soil C stock) and >2 mm (soil C pool) in the 0-5, 5-10, 10-20 and 20-30 cm soil layers were assessed on an equivalent soil mass basis. One year and 1.5 years after deforestation, higher C stocks (+0.64 to 1.16 kg C m-2 yr-1) and C pools (+0.52 to 0.90 kg C m-2 yr-1) were measured in converted soils, compared to those of the forest into the top 30 cm of soil. However, the masses of carbon in these converted soils declined later. The highest rates of carbon decrease were measured between 1.5 and 2 years after forest conversion in the <2 mm soil fraction, from 0.46 kg C m-2 yr-1 (in grassland soils) to 0.71 kg C m-2 yr-1 (in cropland under no tillage). The carbon pool declined during the third year at rates of 0.41 kg C m-2 yr-1 (cropland under disk tillage) to 0.76 kg C m-2 yr-1 (grassland soils). Three years after forest conversion, C masses in the top 30 cm of soils for grassland showed similar values than for forest. In comparison, the carbon stock in cropped soils managed under no tillage in direct seeding (without mulch) was significantly 17% and 16% lower than in forest and grassland soils, respectively. None of the studied agricultural practices succeeded in accumulating carbon from the chopped forest biomass. 650 $aAmazonia 650 $aAgricultura 650 $aBrachiaria 650 $aCarbono 650 $aDesmatamento 650 $aPlantio direto 650 $aSolo 653 $aGuiana Francesa 653 $aSem queima 700 1 $aFUJISAKI, K. 700 1 $aPETITJEAN, C. 700 1 $aSARRAZIN, M. 700 1 $aGODET, M. 700 1 $aGARRIC, B. 700 1 $aHORTH, J.-C. 700 1 $aBALBINO, L. C. 700 1 $aSILVEIRA FILHO, A. 700 1 $aMACHADO, P. L. O. de A. 700 1 $aBROSSARD, M. 773 $tAgriculture, Ecosystems & Environment$gv. 184, p. 101-114, Feb. 2014.
Download
Esconder MarcMostrar Marc Completo |
Registro original: |
Embrapa Amazônia Oriental (CPATU) |
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
Expressão de busca inválida. Verifique!!! |
|
|