Coffea Arabica
Mostrando 13-24 de 1154 artigos, teses e dissertações.
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13. Geographical distribution of the incubation period of coffee leaf rust in climate change scenarios
Resumo: O objetivo deste trabalho foi simular a distribuição geográfica do período de incubação da ferrugem do cafeeiro Coffea arabica, com uso de dados de dois modelos climáticos regionais, o Eta-HadGEM2-ES e o Eta-MIROC5. O cenário de alta emissão de gases de efeito estufa (RCP 8,5 W m-2) foi utilizado para os estados de Minas Gerais e São Paulo,
Pesq. agropec. bras.. Publicado em: 11/11/2019
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14. PRICE AND QUALITY OF COFFEE (COFFEA ARABICA L.) DRIED USING AIR DEHUMIDIFIED BY CONVECTION
ABSTRACT Grain drying processes have been improved to reduce costs and losses of coffee beverage quality. The objectives of this study were to evaluate the quality of coffee dried using air partially dehumidified before entering drying units (DUs) in four coffee-producing farms, as well as the effects of such process on coffee commercial value. The method co
Eng. Agríc.. Publicado em: 04/11/2019
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15. MATHEMATICAL MODELLING AND IMMEDIATE AND LATENT QUALITY OF NATURAL IMMATURE COFFEE UNDER DIFFERENT DRYING CONDITIONS
ABSTRACT This work aimed to study the immediate and latent effects of different relative humidities on the quality of dried coffee fruits, describe the drying kinetics of natural immature coffee (Coffea arabica L.), and evaluate the mathematical model that best fits the experimental drying data. The drying was carried out in a fixed layer dryer coupled to a
Eng. Agríc.. Publicado em: 04/11/2019
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16. Integrated Chemometric Approach to Optimize Sample Preparation for Detecting Metabolic Changes Provoked by Abiotic Stress in Coffea arabica L. Leaf Fingerprints
The effects of water-deficit stress on irrigated and unirrigated field plants of Coffea arabica L. genotype IAPAR 59 were investigated. Plant extracts were obtained following an ethanol-dichloromethane-hexane statistical mixture design. Proton nuclear magnetic resonance (1H NMR) fingerprints of the extracts were discriminated using factor analysis (FA) and h
J. Braz. Chem. Soc.. Publicado em: 21/10/2019
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17. Composición y estructura del dosel de sombra en sistemas agroforestales con café de tres municipios de Cundinamarca, Colombia
Abstract The composition and structure of the shade canopy in coffee plantations of the municipalities of Tibacuy, Pacho and San Juan de Rioseco, in Cundinamarca, Colombia, were studied. Fifteen (15) farms in each municipality were selected and, in each farm, a coffee plantation (Coffea arabica cv. Castillo), in which it was established a plot of 1000 m2, wh
Ciênc. Florest.. Publicado em: 30/09/2019
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18. Leaf area index and radiation extinction coefficient of a coffee canopy under variable drip irrigation levels
ABSTRACT. The leaf area index (LAI) is relevant in studies of phenomena at different scales, such as for the leaf to canopy scale and the calculation of the extinction coefficient of photosynthetically active radiation (kPAR), providing input for the parameterization of physiological basis models. The objective of this work was to verify the variation of the
Acta Sci., Agron.. Publicado em: 23/09/2019
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19. ESTIMATING VEGETATION VOLUME OF COFFEE CROPS USING IMAGES FROM UNMANNED AERIAL VEHICLES
ABSTRACT Tree crops, such as Arabica coffee (Coffea arabica L.), present enormous technical challenges in terms of pesticide application. The correct deposition and distribution of the active ingredient throughout the aerial part of these plants depends on knowledge of the canopy volume, but manually determining this volume is time consuming and imprecise. T
Eng. Agríc.. Publicado em: 09/09/2019
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20. Arabica coffee response to rates of coated and conventional urea in sandy soil
Resumo: O objetivo deste trabalho foi avaliar o crescimento, o índice relativo de clorofila e o teor de N nas folhas, e a produtividade de grãos do cafeeiro arábica (Coffea arabica) adubado com doses de N nas formas de ureia revestida e convencional, em solo arenoso em condição de sequeiro. O experimento foi realizado por três anos agrícolas, com o ca
Pesq. agropec. bras.. Publicado em: 29/08/2019
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21. Influence of Silver Nitrate on Somatic Embryogenesis Induction in Arabica Coffee (Coffea arabica L.)
Abstract The influence of silver nitrate (AgNO3), benzyladenine (BAP), and indole-3-acetic acid (IAA) on low frequency somatic embryogenesis (LFSE) induction in Caturra and Catuaí arabica coffee was evaluated. For the Caturra cultivar, the production of somatic embryos was significantly increased by adding AgNO3 to the semisolid culture medium. The highest
Braz. arch. biol. technol.. Publicado em: 29/08/2019
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22. Arbuscular mycorrhizal fungus on the initial growth and nutrition of Coffea arabica L. genotypes
RESUMO Os benefícios da micorrização ocorrem com o crescimento das hifas nas raízes colonizadas, promovendo uma ampliação da superfície de contato, aumento a absorção de água e nutrientes das raízes, facilitando crescimento inicial.Objetivou-se avaliar o efeito da inoculação fungo micorrizico arbuscular Rhizophagus clarus sobre o desenvolvimento
Ciênc. agrotec.. Publicado em: 12/08/2019
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23. A mixed model applied to joint analysis in experiments with coffee blends using the least squares method
RESUMO O presente estudo tem por objetivo propor um modelo misto em uma análise sensorial de quatro experimentos de blendscom diferentes padrões de qualidade envolvendo as espécies Coffea Arabica L. e Coffea Canephora. Cada experimento foi diferenciado em função das proporções utilizadas na formulação dos blendse das concentrações utilizadas no pr
Rev. Ciênc. Agron.. Publicado em: 04/07/2019
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24. Gene expression during the germination of coffee seed
Resumo: A germinação da semente do café (Coffea arabica L.) é resultado de eventos que ocorrem simultaneamente no embrião e endosperma. Para entender os mecanismos moleculares responsáveis por estes eventos, nós realizamos uma análise transcricional do embrião e dos endospermas micropilar e lateral de sementes embebidas por 10 dias. O sequenciamento
J. Seed Sci.. Publicado em: 01/07/2019