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Registro Completo |
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Biblioteca(s): |
Embrapa Arroz e Feijão. |
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Data corrente: |
23/02/2006 |
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Data da última atualização: |
12/07/2007 |
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Autoria: |
ALMEIDA, C. M. C. V. de; DIAS, L. A. dos S.; OKABE, E. T.; MEDEIROS, J. R. P. |
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Título: |
Variability in genetic resources of cacao in Rondônia, Brazil. |
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Ano de publicação: |
2005 |
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Fonte/Imprenta: |
Crop Breeding and Applied Biotechnology, Viçosa, MG, v. 5, n. 3, p. 317-323, Sept. 2005. |
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Idioma: |
Inglês |
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Conteúdo: |
The limited genetic variation exploited in improvement results in a narrowing of the genetic base and vulnerability of the crop. Breeders should therefore be provided with information on the variability available in germplasm banks. In this study, 207 clone accessions of the cacao genebank were evaluated for five periods for the mean fruit weight, mean weight of wet seeds fruit-1, mean number of normal seeds fruit-1, mean individual wet and mean individual dry seed weight. Data means were subjected to uni- and multivariate analyses. The accessions presented highly significant differences for the five traits, indicating expressive variability. Genotypes of interest were identified for the improvement program of cacao in Rondonia, especially to raise the yield. The accessions EEOP 3, EEOP 5, MA 12, RO 263, RO 265, and STM 66/04 were outstanding for most traits.. |
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Palavras-Chave: |
Caracterização; Characterization; Recursos genéticos; Variabilidade. |
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Thesagro: |
Theobroma Cacao. |
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Thesaurus Nal: |
genetic resources; variability. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01583naa a2200241 a 4500
001 1191910
005 2007-07-12
008 2005 bl uuuu u00u1 u #d
100 1 $aALMEIDA, C. M. C. V. de
245 $aVariability in genetic resources of cacao in Rondônia, Brazil.
260 $c2005
520 $aThe limited genetic variation exploited in improvement results in a narrowing of the genetic base and vulnerability of the crop. Breeders should therefore be provided with information on the variability available in germplasm banks. In this study, 207 clone accessions of the cacao genebank were evaluated for five periods for the mean fruit weight, mean weight of wet seeds fruit-1, mean number of normal seeds fruit-1, mean individual wet and mean individual dry seed weight. Data means were subjected to uni- and multivariate analyses. The accessions presented highly significant differences for the five traits, indicating expressive variability. Genotypes of interest were identified for the improvement program of cacao in Rondonia, especially to raise the yield. The accessions EEOP 3, EEOP 5, MA 12, RO 263, RO 265, and STM 66/04 were outstanding for most traits..
650 $agenetic resources
650 $avariability
650 $aTheobroma Cacao
653 $aCaracterização
653 $aCharacterization
653 $aRecursos genéticos
653 $aVariabilidade
700 1 $aDIAS, L. A. dos S.
700 1 $aOKABE, E. T.
700 1 $aMEDEIROS, J. R. P.
773 $tCrop Breeding and Applied Biotechnology, Viçosa, MG$gv. 5, n. 3, p. 317-323, Sept. 2005.
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Registro original: |
Embrapa Arroz e Feijão (CNPAF) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Agropecuária Oeste. Para informações adicionais entre em contato com cpao.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Agropecuária Oeste; Embrapa Agrossilvipastoril. |
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Data corrente: |
15/10/2018 |
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Data da última atualização: |
19/02/2019 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
SOUZA, L. H. C.; MATOS, E. da S.; MAGALHÃES, C. A. de S.; TORRE, E. R. de la; LAMAS, F. M.; LAL, R. |
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Afiliação: |
LETÍCIA HELENA CAMPOS SOUZA, UNIVERSIDADE FEDERAL DE MATO GROSSO, CUIABÁ, MT; EDUARDO DA SILVA MATOS, CPAMT; CIRO AUGUSTO DE SOUZA MAGALHAES, CPAMT; ÉLIO R. de la TORRE, INSTITUTO MATOGROSSENSE DO ALGODÃO, PRIMAVERA DO LESTE, MT; FERNANDO MENDES LAMAS, CPAO; RATTAN LAL, OHIO STATE UNIVERSITY, COLUMBUS, OHIO. |
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Título: |
Soil carbon and nitrogen stocks and physical properties under no-till and conventional tillage cotton-based system in the Brazilian Cerrado. |
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Ano de publicação: |
2018 |
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Fonte/Imprenta: |
Land Degradation & Development, v. 29, n. 10, p. 3405-3412, Oct. 2018. |
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DOI: |
10.1002/ldr.3105 |
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Idioma: |
Inglês |
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Conteúdo: |
The aim of this study was to investigate soil C and N stocks and soil physical properties under a cotton (Gossypium hirsutum) based system using no?till (NT) and conventional tillage (CT). The experiment was established as a randomized block design with four replications of six treatments as follows: [NT1], NT system with crop rotation of cotton/soybean (Glycine max)/maize (Zea mays) + brachiaria (Brachiaria ruziziensis); [NT2], NT system with crop rotation of soybean/maize + brachiaria/cotton; [NT3], NT system with crop rotation of maize + brachiaria/cotton/soybean; [CR1], CT with annual rotation (soybean/cotton); and [CR2], CT with biannual rotation (soybean/soybean/ cotton) and [CT1] CT with cotton monoculture. An area of native Cerrado vegetation was used as the reference or baseline. Soil samples were obtained from 0? to 5?, 5? to 10?, 10? to 20?, 20? to 30?, 30? to 60?, and 60? to 100?cm depths. After 9 years of cultivation, soil under NT systems contained higher C concentrations than those under CT (p < 0.05); however, significant differences were restricted to the 0? to 5?cm layer. Stocks of C and N in the 0? to 30?cm depth ranged from 36.2 to 39.8 Mg ha?1 and from 2.00 to 2.22 Mg ha?1, respectively. Despite higher C concentration in the upper layer, NT treatments (NT1, NT2, and NT3) had soil C stocks similar to those of CR1 and CT1. In comparison with Cerrado, C stocks in soil under all cultivated treatments were reduced by 27% in the top 1?m depth, which represents a C loss of 35 Mg C ha?1 upon conversion from the Cerrado to cultivated land. The least soil bulk density among all treatments was observed for NT1. However, there were no differences in macroporosity and microporosity among NT and CT systems even after 9 years of cultivation. In comparison with CT, principal benefits of NT systems for C sequestration and soil physical improvements are restricted to the surface layer. MenosThe aim of this study was to investigate soil C and N stocks and soil physical properties under a cotton (Gossypium hirsutum) based system using no?till (NT) and conventional tillage (CT). The experiment was established as a randomized block design with four replications of six treatments as follows: [NT1], NT system with crop rotation of cotton/soybean (Glycine max)/maize (Zea mays) + brachiaria (Brachiaria ruziziensis); [NT2], NT system with crop rotation of soybean/maize + brachiaria/cotton; [NT3], NT system with crop rotation of maize + brachiaria/cotton/soybean; [CR1], CT with annual rotation (soybean/cotton); and [CR2], CT with biannual rotation (soybean/soybean/ cotton) and [CT1] CT with cotton monoculture. An area of native Cerrado vegetation was used as the reference or baseline. Soil samples were obtained from 0? to 5?, 5? to 10?, 10? to 20?, 20? to 30?, 30? to 60?, and 60? to 100?cm depths. After 9 years of cultivation, soil under NT systems contained higher C concentrations than those under CT (p < 0.05); however, significant differences were restricted to the 0? to 5?cm layer. Stocks of C and N in the 0? to 30?cm depth ranged from 36.2 to 39.8 Mg ha?1 and from 2.00 to 2.22 Mg ha?1, respectively. Despite higher C concentration in the upper layer, NT treatments (NT1, NT2, and NT3) had soil C stocks similar to those of CR1 and CT1. In comparison with Cerrado, C stocks in soil under all cultivated treatments were reduced by 27% in the top 1?m depth, which represents... Mostrar Tudo |
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Thesagro: |
Algodão; Carbono; Estoque; Manejo do Solo; Nitrogênio; Plantio Direto; Solo Tropical. |
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Thesaurus NAL: |
Carbon; Cotton; Nitrogen. |
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Categoria do assunto: |
A Sistemas de Cultivo |
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Marc: |
LEADER 02844naa a2200313 a 4500
001 2106103
005 2019-02-19
008 2018 bl uuuu u00u1 u #d
024 7 $a10.1002/ldr.3105$2DOI
100 1 $aSOUZA, L. H. C.
245 $aSoil carbon and nitrogen stocks and physical properties under no-till and conventional tillage cotton-based system in the Brazilian Cerrado.$h[electronic resource]
260 $c2018
520 $aThe aim of this study was to investigate soil C and N stocks and soil physical properties under a cotton (Gossypium hirsutum) based system using no?till (NT) and conventional tillage (CT). The experiment was established as a randomized block design with four replications of six treatments as follows: [NT1], NT system with crop rotation of cotton/soybean (Glycine max)/maize (Zea mays) + brachiaria (Brachiaria ruziziensis); [NT2], NT system with crop rotation of soybean/maize + brachiaria/cotton; [NT3], NT system with crop rotation of maize + brachiaria/cotton/soybean; [CR1], CT with annual rotation (soybean/cotton); and [CR2], CT with biannual rotation (soybean/soybean/ cotton) and [CT1] CT with cotton monoculture. An area of native Cerrado vegetation was used as the reference or baseline. Soil samples were obtained from 0? to 5?, 5? to 10?, 10? to 20?, 20? to 30?, 30? to 60?, and 60? to 100?cm depths. After 9 years of cultivation, soil under NT systems contained higher C concentrations than those under CT (p < 0.05); however, significant differences were restricted to the 0? to 5?cm layer. Stocks of C and N in the 0? to 30?cm depth ranged from 36.2 to 39.8 Mg ha?1 and from 2.00 to 2.22 Mg ha?1, respectively. Despite higher C concentration in the upper layer, NT treatments (NT1, NT2, and NT3) had soil C stocks similar to those of CR1 and CT1. In comparison with Cerrado, C stocks in soil under all cultivated treatments were reduced by 27% in the top 1?m depth, which represents a C loss of 35 Mg C ha?1 upon conversion from the Cerrado to cultivated land. The least soil bulk density among all treatments was observed for NT1. However, there were no differences in macroporosity and microporosity among NT and CT systems even after 9 years of cultivation. In comparison with CT, principal benefits of NT systems for C sequestration and soil physical improvements are restricted to the surface layer.
650 $aCarbon
650 $aCotton
650 $aNitrogen
650 $aAlgodão
650 $aCarbono
650 $aEstoque
650 $aManejo do Solo
650 $aNitrogênio
650 $aPlantio Direto
650 $aSolo Tropical
700 1 $aMATOS, E. da S.
700 1 $aMAGALHÃES, C. A. de S.
700 1 $aTORRE, E. R. de la
700 1 $aLAMAS, F. M.
700 1 $aLAL, R.
773 $tLand Degradation & Development$gv. 29, n. 10, p. 3405-3412, Oct. 2018.
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Registro original: |
Embrapa Agrossilvipastoril (CPAMT) |
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