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| Registros recuperados: 145 | |
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| Teixeira, Gibran da Silva; Maia, Sinezio Fernandes; Figueiredo, Nayana Mangueira; Pereira, Elenildes Santana; Pinto, Pablo Aurelio Lacerda De Almeida. |
| Este artigo trata da aplicabilidade de modelos da família ARCH como ferramenta de análise quanto ao comportamento do retorno do cacau, do boi gordo, do café, tradicionais commodities agrícolas brasileira, servindo de auxílio para decisão dos agentes na compra e venda destes produtos. De forma geral, para as três commodities estudadas, as volatilidades do retorno indicam fortes sinais de persistência, os choques levam um longo tempo para dissipar-se, e choques positivos e negativos têm impacto distinto sobre a volatilidade. Os mercados são assimétricos para o retorno destas commodities. Os mercados futuros do boi gordo e do cacau também sofrem influência do efeito alavancagem, ou seja, se torna mais volátil perante informações negativas do que informações... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Cacau; Boi gordo; Café; Cocoa; Fatcow; Coffee; Community/Rural/Urban Development; International Relations/Trade. |
| Ano: 2008 |
URL: http://purl.umn.edu/109785 |
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| Aredes, Alan Figueiredo de; Pereira, Matheus Wemerson Gomes; Santos, Vladimir Faria dos; Santos, Maurinho Luiz dos. |
| The objective of this article was to evaluate the yield and risk in the production and storage of the Arabian coffee. Cash flows are elaborated for coffee production in two productive systems, one with low productivity and other with high productivity. Twelve different scenarios are simulated, each one representing the returns and risks in the production and storage for every month of the year. The financial indicators Payback Period (PP), Net Present Value (VPL) and Internal Rate of Return (TIR) and the indicator Average Cost (CMe), suggest that high productivity is important to increase profitability and to decrease the activity risk, being the best periods to sale coffee, on the part of the producers, the months that precede the harvest, January,... |
| Tipo: Journal Article |
Palavras-chave: Financial Economics; Coffee; Return; Risk. |
| Ano: 2008 |
URL: http://purl.umn.edu/53876 |
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| Balota,Elcio Liborio; Yada,Ines Fumiko Ubukata; Amaral,Higo Furlan; Nakatani,Andre Shigueyoshi; Hungria,Mariangela; Dick,Richard Peter; Coyne,Mark Steven. |
| Many forested areas have been converted to intensive agricultural use to satisfy food, fiber, and forage production for a growing world population. There is great interest in evaluating forest conversion to cultivated land because this conversion adversely affects several soil properties. We examined soil microbial, physical, and chemical properties in an Oxisol (Latossolo Vermelho distrófico) of southern Brazil 24 years after forest conversion to a perennial crop with coffee or annual grain crops (maize and soybeans) in conventional tillage or no-tillage. One goal was to determine which soil quality parameters seemed most sensitive to change. A second goal was to test the hypothesis that no-tillage optimized preservation of soil quality indicators in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Land use; Tillage; Coffee; Biological activity; Potential mineralization; Aggregate stability. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000401003 |
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| Melo,Vander Freitas; Orrutéa,Alessandro Góis; Motta,Antônio Carlos Vargas; Testoni,Samara Alves. |
| ABSTRACT Many Amazonian farmers use the slash-and-burn method rather than fertilization for crop production. The aim of the present study was to evaluate changes in the morphological, physical, and chemical properties of naturally fertile Inceptisols after conversion from native forest to different uses in southern Amazonia, Brazil. Land covered by dense native forest (NF) was split into four areas of 1.0 ha each. Three areas were slashed and burned and then cultivated for 11 years with coffee (CO), secondary forest (SF), and pasture (PA). Four soil profiles were sampled in each treatment (four uses × four replicates). The mean value distribution of each physical and chemical analysis was determined for different depths, and standard error bars were placed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Secondary forest; Coffee; Pasture; Slash and burn; Ash effect. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100523 |
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| Silva,Samuel de Assis; Lima,Julião Soares de Souza. |
| Information underlying analyses of coffee fertilization systems should consider both the soil and the nutritional status of plants. This study investigated the spatial relationship between phosphorus (P) levels in coffee plant tissues and soil chemical and physical properties. The study was performed using two arabica and one canephora coffee variety. Sampling grids were established in the areas, and the points georeferenced. The assessed properties of the soil were levels of available phosphorus (P-Mehlich), remaining phosphorus (P-rem) and particle size, and of the plant tissue, phosphorus levels (foliar P). The data were subjected to descriptive statistical analysis, correlation analysis, cluster analysis, and probability tests. Geostatistical and trend... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coffee; Remaining P; Cokriging; Geostatistics. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000500009 |
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| Fia,Fátima R. L.; Borges,Alisson C.; Matos,Antonio T. de; Duarte,Iolanda C. S.; Fia,Ronaldo; Campos,Lidiane C. de. |
| In recent decades the use of anaerobic fixed bed reactors has been established in Brazil for the treatment of different effluents. As the capability of retaining microorganisms by support media (fixed bed) is a factor influencing the performance of these reactors, the present study aims at evaluating the influence of three fixed bed on the effectiveness of treating an effluent with high pollution potential: wastewater from coffee grain processing (WCP), with organic matter concentrations varying from 812 to 5320 mg L-1 in the form of chemical oxygen demand (COD). Support media used for the immobilization of biomass were: blast furnace slag, polyurethane foam and #2 crushed stone with porosities of 53, 95 and 48%, respectively. The mean efficiency of COD... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anaerobic treatment; Microbial biomass; Support media; Coffee. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662010000200013 |
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| Ribeiro,Kleber M.; Braga,Roberto A.; Scalco,Myriane S.; Horgan,Graham W.. |
| The total leaf area (TLA) estimation is an important feature of the crops and their assessment a challenge, since the direct methods of obtaining it are destructive and time consuming. Non-destructive methods have been explored to obtain the TLA by indirect approaches, in turn creating other features, as the leaf area index. The development of non-destructive technology to access the TLA of a plant has been the subject of much research, and the optical metrology is an promising approach. In this work, some indirect methods associated with optical approaches were evaluated as an alternative to obtain the TLA of the coffee plant. Commercial equipment were used, such as a camera with a fish eye lens and lux meters, associated to the sizes of the canopies were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Optics; Non-destructive technique; Coffee. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662013000600004 |
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| Gómez,Jaime; Barrera,Juan F.; Liedo,Pablo; Valle,Javier. |
| The importance of age and feeding on the performance of Cephalonomia stephanoderis (Hymenoptera, Bethylidae), a parasitoid of the coffee berry borer, Hypothenemus hampei (Coleoptera, Curculionidae) was investigated in the laboratory. Groups of female parasitoids were subject to the following treatments: a group fed during one, five and ten days after emergence of adults with coffee borer larvae; another group fed only with honey solution during five days after emergence; and as a control, a third group was kept without food for five days. At the end of each treatment, survivorship, parasitoid activity (walking and flying capacity in an arena), search capacity for finding coffee borer-infested berries, host feeding and oviposition (on immature hosts), were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biological control; Coffee; Host feeding; Host searching; Survivorship. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262012000100015 |
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| Bignotto,Edson Costa; Azevedo Filho,Adriano. |
| This study characterizes the use of risk monitoring mechanisms by coffee and soybean trading and processing companies. It also investigates the role these mechanisms play in the mitigation of certain transaction costs associated to bounded rationality, information asymmetry, and business opportunism in negotiations involving derivatives. The results presented are based on literature and original research, which consisted of interviews with 19 coffee and soybean trading and processing company agents that deal with the management and execution of derivatives trades. The interviews suggest that the interest in formal risk monitoring mechanisms depends strongly on the organizational structure of the business. In family businesses, in which the owner... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Transaction cost; Financial risk; Coffee; Soybeans. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-20032003000100002 |
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| Maluf,Mirian Perez; Silvestrini,Milene; Ruggiero,Luciana Machado de Campos; Guerreiro Filho,Oliveiro; Colombo,Carlos Augusto. |
| One of the greatest problems in Coffea arabica breeding is identifying precisely any inbred line, based only on botanical and agronomical descriptors, because of the reduced genetic variability of the species, close pedigree origin, which results in small phenotypic variation. Recently, molecular markers have been used for plant germplasm characterization and identification in several commercial species. This work evaluates the reliability of three marker systems: RAPD, AFLP and SSR, to characterize the genetic variability of commercially-used Coffea inbred lines developed by the Instituto Agronômico (IAC), and their potential for cultivar identification. All methods identified polymorphisms among the cultivars. The genetic diversity recognized by the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coffee; Cultivar identification; Molecular markers. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000400010 |
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| Brighenti,Carla Regina Guimarães; Cirillo,Marcelo Ângelo; Costa,André Luís Alves; Rosa,Sttela Dellyzete Veiga Franco da; Guimarães,Renato Mendes. |
| ABSTRACT: Tetrazolium tests use conventional sampling techniques in which a sample has a fixed size. These tests may be improved by sequential sampling, which does not work with fixed-size samples. When data obtained from an experiment are analyzed sequentially the analysis can be terminated when a particular decision has been made, and thus, there is no need to pre-establish the number of seeds to assess. Bayesian statistics can also help, if we have sufficient knowledge about coffee production in the area to construct a prior distribution. Therefore, we used the Bayesian sequential approach to estimate the percentage of viable coffee seeds submitted to tetrazolium testing, and we incorporated priors with information from other analyses of crops from... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beta distribution; Seed analysis; Sampling; Coffee; Prior distribution. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001300198 |
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| Assis,Cristiane Pereira de; González-Vila,Francisco Javier; Jucksch,Ivo; González-Pérez,Jose Antonio; Neves,Júlio César Lima; Lani,João Luis; Mendonça,Eduardo de Sá. |
| Soil organic matter of a humic Oxisol has been characterized by analyzing litter and soil lipid composition under vegetal covers (coffee, pasture and fragment of native forest). Soil and litter samples were collected from each site at two depths (0-10 and 60-100 cm). Lipid composition was determined by gas chromatography-mass spectrometry (CG-MS). In the solvent extracts of the soil lipids, even-numbered n-alkanoic acids in the range of C16-C32 indicate a soil organic matter input from higher plant waxes. The major compound classes in both the soil and the litter included saturated n-alkanoic acids, with average values in the total spectrum of 58 and 53%, respectively Clear differences in lipid composition were found between the topsoil and subsurface.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil and litter lipid; Soil management; Tropical soil; Grass; Coffee. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200014 |
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| Dias,Guilherme Faus da Silva; Alves,Pedro Luís da Costa Aguiar; Dias,Tomás Carneiro de Souza. |
| Brachiaria decumbens is becoming one the most common weeds growing in young coffee orchards because, besides its fast growth and difficulty of control, new coffee orchards are usually established in pasture areas. In order to verify the effect of B. decumbens plant density on the early growth of coffee (Coffea arabica L. cv. Catuaí Amarelo), a competition experiment was conducted under semi-controlled humidity conditions. Soil collected in a Typic Haplustox was placed in 70 L asbestos cement boxes and one coffee seedling was planted in each box. The B. decumbens seedlings were transplanted to the boxes at the 2-4 leaf stage. Treatments consisted of 0, 4, 8, 12, 16, 20, 24, 36, 48, and 60 weeds m-2. The experimental period started 120 days after... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Weed; Coffee; Competition; Growth suppression. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600003 |
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| GAMBOA-GAITÁN,MIGUEL ÁNGEL. |
| Fungi are common inhabitants of plants and plant-derived products. Some of these fungal species are potentially dangerous to human health since they are able to produce chemical substances that alter normal physiological activity. There are no studies about natural mycoflora associated with coffee beans in Colombia, and nothing is known about the presence and abundance of toxigenic fungal species in Colombian coffee. In this study 5,000 coffee beans were studied by plating them on potato-based artificial culture medium and it was shown that potentially toxigenic fungal taxa (mostly from genera Aspergillus, Fusarium, Penicillium), are currently found in Colombian coffee beans. This is true for all steps of coffee processing, from berries in trees to toasted... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Commodities; Food microbiology; Coffee; Mycotoxins. |
| Ano: 2012 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2012000100003 |
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| Andrade Júnior, Saul de; Universidade Federal do Espírito Santo/CEUNES.; Alexandre, Rodrigo Sobreira; Universidade Federal do Espírito Santo (UFES/CEUNES).; Schmildt, Edilson Romais; Universidade Federal do Espírito Santo (UFES/CEUNES).; Partelli, Fábio Luiz; Universidade Federal do Espírito Santo (UFES/CEUNES).; Ferrão, Maria Amélia Gava; Empresa Brasileira de Pesquisa Agropecuária; Mauri, Aldo Luiz; Instituto Capixaba de Pesquisa. |
| The purpose of this study was to assess the growth of conilon coffee tree plantlets that were propagated by grafting and cutting. The experiment was conducted at the plantlet production site of Incaper’s Experimental Farm in the city of Marilândia, Espírito Santo State. For grafting, plantlets derived from the seed propagation of Coffea canephora cv. Robusta Tropical (ENCAPER 8151) were used as rootstocks, and six clones of cv. Conilon Vitória (INCAPER 8142) were used as the grafts. The cutting was performed with six clones that were used for grafting. The experimental design consisted of randomized blocks of twelve treatments with five repetitions composed of twelve plantlets. On the hundred and fifth day, the averages of the variables were assessed and... |
| Tipo: Produção vegetal |
Palavras-chave: 5.01.00.00-9 Coffea canephora; Coffee; Growth; Cloning Agronomia. |
| Ano: 2013 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/16917 |
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| Ramos, Darlê Martins Barros; Faculdades Unidas do Norte de Minas- FUNORTE- Montes Claros- MG; Silva, Cristina Ferreira; Departamento de Biologia- Universidade Federal de Lavras- CP 3037 , Lavras- MG; Batista, Luís Roberto; Departamento de Ciência dos Alimentos- Universidade Federal de Lavras- CP 3037 Lavras- MG; Schwan, Rosane Freitas; Departamento de Biologia- Universidade Federal de Lavras- CP 3037 , Lavras- MG. |
| O café é um produto nacional com grande expressão para a economia brasileira. O uso excessivo de fungicidas tem levado a pesquisas sobre formas alternativas como o controle biológico. Objetivou-se avaliar o potencial antagônico de leveduras em co-cultivo com fungos filamentosos. Isolados das espécies Debaryomyces hansenii (UFLACF 889 e UFLACF 847) e Pichia anomala (UFLACF 710 e UFLACF 951) foram inoculados (103 a 106 células mL-1) com três espécies de fungos filamentosos, Aspergillus ochraceus, A. parasiticus e Penicillium roqueforti (103 a 106 esporos mL-1). A avaliação do crescimento micelial e a contagem de esporos foram realizadas durante 21 dias. Observou-se que o isolado UFLACF 889 apresentou, em média, maior efeito inibitório na produção de... |
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Palavras-chave: 2.12.00.00-9 Leveduras; Fungos filamentosos; Biocontrole; Café; Debaryomyces; Pichia 2.12.00.00-9 Yeasts; Filamentous fungi; Biocontrol; Coffee; Debaryomyces; Pichia. |
| Ano: 2010 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/3361 |
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| Greco, Marcelo; Corpo de Bombeiros; Campos, Alessandro Torres; UFVJM Diamantina/MG; Klosowski, Elcio Silvério; PPGAM/GPEA/Unioeste Marechal Cândido Rondon/PR. |
| Este trabalho teve como objetivo avaliar a redução da temperatura nas partes externas de um secador de camada fixa para café, mediante diferentes combinações de tempo de revolvimento, utilizando-se termômetro sem contato. O experimento foi desenvolvido no mês de junho de 2004 em uma propriedade localizada em Jesuítas, Estado do Paraná. Foi utilizado café (Coffea arábica L.), variedade IAC 81. O secador utilizado foi o modelo de camada fixa, com câmara de secagem metálica, de formato cilíndrico, com um sistema de revolvimento de grãos adaptado. Observou-se que houve, em média, uma redução térmica de 156,7°C (79,1%) no sistema que vai da fornalha até a câmara de secagem. A combinação que proporcionou menor redução da temperatura foi a com ventilação... |
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Palavras-chave: 5.03.03.01-5 perda de temperatura; Secagem; Café; Camada fixa Pré-Processamento de Produtos Agrícolas loss of temperature; Drying; Coffee; Fixed bed. |
| Ano: 2010 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/3676 |
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| Valente,Angela M.M.P.; Ferreira,Antonio G.; Daolio,Cristina; Rodrigues Filho,Edson; Boffo,Elisangela F.; Souza,Antonia Q.L.; Sebastianes,Fernanda L.S.; Melo,Itamar S.. |
| The chemical reactions carried out by microorganisms have been used as a tool in modern chemistry. This paper reports the production of mycophenolic acid and a new phthalide by the endophytic fungus Penicillium crustosum obtained from coffee seeds. The fungus was cultivated in a liquid medium for a period of seven days and after that the culture medium was divided into four treatments: A, B, C and D, to which different organic substances were added. Treatment A was maintained as the control to evaluate the occurrence of biotransformation. Organic acids were added to the culture media of treatments B (ferulic and quinic acids) and C [cinnamic and 3,4-(methylenedioxy) cinnamic acids], and caffeine was added in the treatment D. All these organic compounds... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coffee; Endophytic fungus; Mycophenolic acid; Penicillium crustosum; 5-hydroxy-7-methoxy-4-methylphthalide. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200487 |
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| Registros recuperados: 145 | |
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