SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

Sumida, Ciro Hideki; Fantin, Lucas Henrique; Gonçalves, Ricardo Marcelo; Canteri, Marcelo Giovanetti; Araujo, Kelly Lana; Giglioti, Éder Antônio.

Orange rust caused by the fungus Puccinia kuehnii greatly affects sugarcane and causes millions of tons of losses in production. This condition was first reported in Brazil at the end of 2009. The disease is currently present in most of the countries that produce this crop. The aim of this research was to develop risk maps of P. kuehnii infection using temperature and relative humidity data, provided by 389 automatic weather stations throughout the country. A spatial distribution analysis was carried out to assess the number of daily hours of favorable conditions for spore germination in each region. In the central-south region, where the main sugarcane producing states are concentrated, two distinct periods were observed during the three years studied....

Ação do enxofre em chuva ácida simulada sobre parâmetros morfofisiológicos de Phaseolus vulgaris L. (Fabaceae) - doi: 10.4025/actasciagron.v32i3.4273

Palavras-chave: 5.00.00.00-4; 5.01.00.00-9; 5.01.02.00-1 orange rust; Sugarcane; Epidemiology; Prediction. Fitopatologia.

Ano: 2018

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/39905

Dias, Bruna Borba; Universidade Federal de Santa Catarina; Leite, Maysa de Lima; Universidade Estadual de Ponta Grossa, Paraná; Farago, Paulo Vitor; Universidade Estadual de Ponta Grossa, Paraná; Oliveira, André Vicente de; Universidade Estadual de Ponta Grossa, Paraná; Beruski, Gustavo Castilho; Universidade Estadual de Ponta Grossa, Paraná.

O presente trabalho teve o objetivo de analisar os efeitos do enxofre e da chuva ácida simulada sobre a estrutura foliar do feijoeiro (Phaseolus vulgaris L), nos aspectos morfoanatômicos, teores de clorofila a, b, total e feofitina. As plantas-controle sofreram simulações de chuva com pH 6,0 e as plantas-teste sofreram simulação de chuva ácida com pH 3,0. As concentrações de clorofila a, b e total diminuíram no estádio de floração (R6). Já, no estádio R7, onde surgem as primeiras vagens, os teores aumentaram, indicando possível resistência e/ou adaptação dos espécimes às simulações ácidas. O tratamento ácido afetou a concentração de clorofila que foi degradada por processos oxidativos sem a sua conversão em feofitina. Também se observou diminuição na...

Palavras-chave: 5.00.00.00-4; 5.01.03.06-7; Phaseolus vulgaris; Chuva ácida; Enxofre; Clorofila; Anexos epidérmicos Ciências Agrárias e Fisiologia de Plantas Cultivadas Phaseolus vulgaris; Acid rain; Sulfur; Chlorophyll; Epidermal annexes.

Ano: 2010

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/4273

Behavior of Jatropha curcas L. seeds under osmotic stress: germination and cell cycle activity

Brito, Cristiane Dantas de; Loureiro, Marta Bruno; Teles, Clarissa Abreu Santosw; Schuck, Mariane Ruzza; Fernandez, Luzimar Gonzaga; Castro, Renato Delmondez de.

Jatropha curcas is an oil-rich Euphorbiaceae seed species renowned for its apparent tolerance to environmental stresses. It is considered a promising source of renewable feedstock for biodiesel production in the Brazilian semiarid region where crop establishment requires a better understanding of the mechanisms leading to proper seed and plant behavior under water restrictive conditions. This study describes physiological and cytological profiles of J. curcas seeds imbibed in water restriction conditions by means of osmotic stress or osmoconditioning. Seeds were characterized by size, weight, moisture content and dry mass, germinability, and cell cycle activation by means of tubulin and microtubule cytoskeleton accumulation. Osmoconditioning at -0.8 MPa...

Behavior of Orius insidiosus preying on Aphis gossypii reared on transgenic and conventional cotton varieties

Palavras-chave: 5.00.00.00-4; 5.01.03.06-7; 5.01.03.03-2 Jatropha sp.; Germination; Drought stress; Cell cycle Ciências Agrárias.

Ano: 2015

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/19438

Veiga, Ana Carolina Pires; Universidade Estadual Paulista “Julio de Mesquita Filho”; Laurentis, Valéria Lucas de; Universidade Estadual Paulista “Julio de Mesquita Filho”; Vacari, Alessandra Marieli; Universidade Estadual Paulista “Julio de Mesquita Filho”; Volpe, Haroldo Xavier Linhares; Universidade Estadual Paulista “Julio de Mesquita Filho”; Ramalho, Dagmara Gomes; Universidade de São Paulo; De Bortoli, Sergio Antonio; Universidade Estadual Paulista “Julio de Mesquita Filho”.

The objective of this study was to evaluate the functional response of Orius insidiosus preying on the third and fourth instars of Aphis gossypii nymphs that were reared on transgenic NuOPAL (Bollgard I Event 531) and conventional Buriti cotton varieties. Fifty O. insidiosus female bugs aged 12–24h were distributed into five different Petri dishes with different densities of A. gossypii (2, 4, 8, 16, and 32 nymphs per plate) for each cotton variety. The number of prey consumed was evaluated over the course of 12h, with a final assessment at 24h. The handling times (Th) and attack rates (a) were 0.0697h and 1.1862h-1, respectively, for the Buriti variety and 0.0713h and 0.3030h-1, respectively, for the NuOPAL variety. The average number of prey consumed by...

Chemical characterization and evaluation of the antioxidant potential of gabiroba jam (Campomanesia xanthocarpa Berg) - doi: 10.4025/actasciagron.v35i1.14389

Palavras-chave: 5.00.00.00-4; 5.01.02.00-1; 5.01.02.02-8 cotton aphid; Functional response; Gossypium hirsutum; Minute pirate bug; Transgenic plants Ciências Agrárias Fitossanidade e Entomologia Agrícola.

Ano: 2014

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/17466

Santos, Marli da Silva; Universidade Federal do Paraná; Lima, Jair José de; Universidade Federal do Paraná; Petkowicz, Carmen Lúcia de Oliveira; Universidade Tecnológica Federal do Paraná; Cândido, Lys Mary Bileski; Universidade Federal do Paraná/Universidade Tecnológica Federal do Paraná.

Four formulations of gabiroba jam were processed, and their physicochemical and functional characteristics, rheological profile and jam acceptance were assessed. The physicochemical and chemical characteristics evaluated were water activity, titratable acidity, pH, reducing and non-reducing sugars, proteins, ashes, dietary fibers, color, and firmness. For functional analyses of the formulations, vitamin C, phenolic compounds and carotenoid contents were determined. The ABTS+ and DPPH· methods were employed to evaluate the antioxidant potential. Rheological analysis was performed in a HAAKE RS 75 Rheoestress rheometer with a plate/plate sensor. The flow curve behavior was adjusted using the Power Law and Herschel-Bulkley models. Sensory analyses were...

Tipo: Pesquisa

Palavras-chave: 5.00.00.00-4; 5.02.04.00-9; 5.02.02.00-6 gabiroba; Jam; Antioxidant activity; Rheological profile ciências agrarias; Ecnologia e Utilização de Produtos Florestais; Manejo Florestal.

Ano: 2012

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/14389

Compatibility among fungicide treatments on soybean seeds through film coating and inoculation with Bradyrhizobium strains - doi: 10.4025/actasciagron.v32i4.5756

Pereira, Carlos Eduardo; Universidade Estadual de Santa Cruz; Moreira, Fátima Maria de Souza; Universidade Federal de Lavras; Oliveira, João Almir; Universidade Federal de Lavras; Caldeira, Carla Massimo; Universidade Federal de Lavras.

This research evaluated the development of soybean plants grown in a greenhouse, from seeds that were treated with fungicide, film coated and inoculated with Bradyrhizobium. Seeds from the soybean cultivar ‘Vencedora’ were submitted to treatments disposed in a factorial 5 x 3 x 2 design. The seeds were treated with Derosal Plus® with polymer; Tegran® with polymer; Derosal Plus® without polymer, Tegran® without polymer; and without fungicide and without polymer. After the chemical treatment, the seeds were inoculated with peat or liquid inoculants, and without inoculant. The chemical treatments were used either previous to or after the six months of storage. Seed inoculation was performed with CPAC15 and BR29 strains,...

Palavras-chave: 5.00.00.00-4; 5.01.00.00-9; 5.01.01.04-8; 5.01.02.05-2; 5.01.03.00-8; 5.01.03.03-2 Glycine Max; Polymer; Tegran; Derosal Plus; Bradyrhizobium Ciências Agrárias; Agronomia; Microbiologia e Bioquímica do Solo; Defesa Fitossanitária; Fitotecnia; Produção e Beneficiamento de Sementes Glycine Max; Polymer; Tegran; Derosal Plus; Bradyrhizobium.

Ano: 2010

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/5756

Consideration of the appropriate variation sources of the statistical model and their impacts on plant breeding

Melo, Rita Carolina de; Coimbra, Jefferson Luís Meirelles; Trevisani, Nicole; Guidolin, Altamir Frederico; Kavalco, Sydney Antonio Frehner.

The present work has aimed to assess the consideration of the appropriate variation sources of the statistical model and their impacts on the conclusions plant breeding. The Value for Cultivation and Use test was conducted to assess three common locations (Lages, Ponte Serrada, and Canoinhas) and four non-common locations (Chapecó, Guatambu, Urussanga, and Campos Novos). The grain yields of six bean genotypes were evaluated in order to represent the imbalance between the common and non-common locations. The statistical analysis considered two situations: i) union of the location factors and cultivation years, with a single variation source called environment and ii) decomposition of the mean square values of the two factors, location and year. According to...

Correlation between performance and feeding behavior of feedlot lambs fed without roughage diet

Palavras-chave: 5.00.00.00-4; 5.01.03.00-8 VCU trials; Variance analysis; Mathematical expectations. Melhoramento Vegetal.

Ano: 2018

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/39791

Cardoso, Elves de Souza; Santana Junior, Hermógenes Almeida de; Oliveira, Aracele Prates de; Ferreira, Antônio Hosmylton Carvalho de; Oliveira, Zeliana Fernandes de; Freitas, Tiago Brandão.

The objective was to evaluate the correlation between performance and feeding behavior of feedlot castrated Santa Inês lambs fed without roughage diet, weighing 20 ± 1,8 kg and four months of age (± 0,34). A completely randomized design was adopted. Correlations were obtained by Pearson’s linear correlation analysis and the t test, and processed on SAS software (version 9.2). The variables number of rumination chews per cud, number of cuds ruminated per day, speed of each chew, and number of rumination cuds per day were positively correlated with the variation in body weight (p < 0.05). For number of cuds ruminated per day, a positive correlation was found with the variations in body weight. Initial and final body weights were positively correlated with...

Data transformation: an underestimated tool by inappropriate use

Palavras-chave: 5.00.00.00-4; 5.04.00.00-2; 5.04.03.00-1 concentrate; Intake; Weight gain; Sheep..

Ano: 2017

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/33453

Ribeiro-Oliveira, João Paulo; Santana, Denise Garcia de; Pereira, Vanderley José; Santos, Carlos Machado dos.

There are researchers who do not recommend data transformation arguing it causes problems in inferences and mischaracterises data sets, which can hinder interpretation. There are other researchers who consider data transformation necessary to meet the assumptions of parametric models. Perhaps the largest group of researchers who make use of data transformation are concerned with experimental accuracy, which provokes the misuse of this tool. Considering this, our paper offer a study about the most frequent situations related to data transformation and how this tool can impact ANOVA assumptions and experimental accuracy. Our database was obtained from measurements of seed physiology and seed technology. The coefficient of variation cannot be used as an...

Dinâmica de crescimento da abobrinha italiana em duas estações de cultivo - doi: 10.4025/actasciagron.v33i2.5952

Palavras-chave: 5.00.00.00-4; 5.01.03.00-8 assumptions; Coefficient of variation; Criteria for data transformation; Parametric and nonparametric statistics; Robustness. Análise de Dados.

Ano: 2018

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/35300

Strassburger, André Samuel; Universidade Federal de Pelotas; Peil, Roberta Marins Nogueira; Universidade Federal de Pelotas; Fonseca, Leandro Andrade da; Universidade Federal de Pelotas; Aumonde, Tiago Zanatta; Universidade Federal de Pelotas; Mauch, Carlos Rogério; Universidade Federal de Pelotas.

O objetivo deste trabalho foi quantificar os índices de crescimento, a produção e a distribuição de matéria seca da cultura da abobrinha italiana cultivada em substrato de casca de arroz in natura com solução nutritiva recirculante, em duas épocas de cultivo: primavera-verão de 2005 e verão-outono de 2006, caracterizadas, respectivamente, como períodos de alta e baixa disponibilidades de radiação solar. Cada tratamento correspondeu a uma época de amostragem, sendo a produção de matéria seca quantificada aos 0, 18, 32, 46 e 68 dias após o transplante (DAT) no cultivo de primavera-verão, e aos 0, 15, 29, 43 e 55 DAT no cultivo de verão-outono. A produção de matéria seca foi maior quando a disponibilidade de radiação solar foi mais elevada. Nessa situação...

Tipo: Pesquisa de Campo

Palavras-chave: 5.00.00.00-4; 5.01.00.00-9 Cucurbita pepo L.; Produção de matéria seca; Hidroponia; Área foliar; Radiação solar; Análise de crescimento 5.01.03.00-8 Cucurbita pepo L.; Dry matter production; Hydroponics; Leaf area; Solar radiation; Growth analysis.

Ano: 2011

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/5952

Efeito da temperatura e umidade do substrato na viabilidade de Sclerotium rolfsii - DOI: 10.4025/actasciagron.v32i2.2325

Martins, Marlon Vagner Valentim; Incaper; Silveira, Silvaldo Felipe; UENF; Mussi-Dias, Vicente; UENF; Vieira, Henrique Duarte; UENF.

Avaliou-se a erradicação de escleródios de Sclerotium rolfsii em diferentes temperaturas e umidades do substrato. Testaram-se umidades de 5, 6, 9 e 11 (equivalentes a -5, -3, -1 e -1/3 Bar) e mais 0 e 18% de umidade. As temperaturas testadas foram 40, 48, 52 e 58°C, no tempo de 30 min., seguidos de resfriamento em balcão, em condições de laboratório. Avaliou-se a germinação em meio BDA salino. A 0% de umidade do substrato, nenhuma temperatura foi eficiente na inativação dos escleródios. Para todas as outras umidades testadas, porém, os escleródios foram erradicados em temperaturas acima de 52°C. De todas as quatro temperaturas testadas, apenas a menor (40°C) não inativou os escleródios do patógeno. A 48°C, a erradicação dos...

Palavras-chave: 5.00.00.00-4; 5.01.02.01-0 Escleródio; Solarização do solo; Erradicação Fitopatologia Sclerotia; Soil solarization; Eradication.

Ano: 2010

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/2325

Effects of climate change on irrigation adoption in Brazil

Cunha, Dênis Antônio da; Universidade Federal de Viçosa; Coelho, Alexandre Bragança; Universidade Federal de Viçosa; Féres, José Gustavo; Instituto de Pesquisa Econômica Aplicada; Braga, Marcelo José; Universidade Federal de Viçosa.

http://dx.doi.org/10.4025/actasciagron.v36i1.15375The aim of this paper is to analyse the effects of climate change on irrigation adoption in Brazil. Temperature and precipitation projections for the 2010-2099 periods were employed under a number of different climate scenarios according the 4th Assessment Report of Intergovernmental Panel on Climate Change (IPCC). The results show that irrigation adoption will be affected by climate change. Given current conditions, irrigation has generally been adopted in Brazil to cope with reduced precipitation and temperature variations. The estimated irrigation probabilities in the future scenarios were quite different across Brazilian regions. The main explanation for this pattern is the distinct climatic conditions...

Genetic control of partial resistance to Asian soybean rust doi: 10.4025/actasciagron.v36i1.16919

Palavras-chave: 5.00.00.00-4; 5.03.02.01-9 climatic variability; Adaptation; Irrigated farming Ciências Agrárias; Irrigação; Clima..

Ano: 2014

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/15375

Martins, Juliana Araújo Santos; Instituto Federal de Educação, Ciência e Tecnologia do Triângulo Mineiro; Juliatti, Fernando Cezar; Universidade Federal de Uberlandia.

The genetic control of rust resistance was studied using the Caiapônia x IAC-100 and Luziânia x Potenza crosses. The F2 and F3 generations were evaluated. Rust severity was quantified through visual assessment of the middle third of three leaflets per plant and performed by three different evaluators; the average score was calculated foreach individual plant. From these data, we estimated the mean and variance of the genetic components by employing the weighted least squares method. The estimated number of genes and broad- and narrow-sense heritabilities were also obtained. It was concluded that rust resistance is a characteristic controlled by 2 to 23 genes that are predominantly dominant. The estimate of narrow-sense heritability was greater than 70% for...

Growing tropical forage legumes in full sun and silvopastoral systems

Palavras-chave: 5.00.00.00-4; 5.01.00.00-9; 5.01.02.01-0; 5.01.03.05-9 Glycine max; Phakopsora pachyrhizi; Dominance variance; Heritability; Race non-specific disease resistance Melhoramento Vegetal e Fitopatologia.

Ano: 2014

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/16919

Araújo, Saulo Alberto do Carmo; Silva, Tatiana Oliveira da; Rocha, Norberto Silva; Ortêncio, Marluci Olício.

Growth was evaluated three tropical forage legumes in two cropping systems: silvopastoral system (SSP) and full sun. A completely randomized design was adopted in factorial three legumes (estilosanthes cv. Campo Grande (Stylozanthes macrocephala x Stylozanthes capitata), tropical kudzu (Pueraria phaseoloides (Roxb.) Benth) and macrotiloma (Macrotyloma axillare cv. Java)) x two farming systems, with 4 repetitions. A eucalyptus SSP already deployed, with spatial arrangement of 12 x 2 m between trees was used. Legumes were planted in January 2014 a uniform cut being made in May 2014. The court assessment was carried out 125 days after the uniformity cut. There was difference for mass production of dry legumes (PMMSL) between cultivation systems, evidencing...

Image analysis of coffee seeds submitted to the LERCAFE test

Palavras-chave: 5.00.00.00-4; 5.04.00.00-2 Fabaceae; Shading; Forage production; Chemical composition.

Ano: 2017

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/32537

Ribeiro, Bárbara Gomes; Abrahão, Christovão Pereira; Nery, Marcela Carlota; Nascimento, Rodrigo Marques; Rezende, Juliana Costa; Fialho, Cíntia Maria Teixeira.

The aim of this experiment was to quantify the stained areas of coffee seeds submitted to the LERCAFE test using image analysis. The seeds used were of the Catuaí Vermelho IAC 99 and Paradise cultivars. The physiological quality of the lots was assessed using germination tests, moisture content and a germination speed index. The LERCAFE test was conducted using seeds without parchment immersed in a solution of 3% sodium hypochlorite for 3 hours. Color photographs (RGB) with a resolution of 5 MPx were taken of each seed. The seeds were visually evaluated, and the functions generated from the analyses of the stained and non-stained regions were quantified by the Matlab R2009b program. Classification models were developed based on the Fisher Linear...

Mathematical modeling of the drying process of corn ears - doi: 10.4025/actasciagron.v33i4.7079

Palavras-chave: 5.00.00.00-4; 5.01.00.00-9; 5.01.03.00-8; 5.01.03.03-2 determinants functions; Sodium hypochlorite; Pixels Produção e Beneficiamento de Sementes.

Ano: 2016

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/28268

Corrêa, Paulo Cesar; Universidade Federal de Viçosa; Botelho, Fernando Mendes; Universidade Federal de Viçosa; Oliveira, Gabriel Henrique Horta; Universidade Federal de Viçosa; Goneli, André Luis Duarte; Universidade Federal da Grande Dourados; Resende, Osvaldo; Universidade Federal de Viçosa; Campos, Sílvia de Carvalho; Universidade Federal de Viçosa.

The objective of this work was to study and model the drying process of corn ears at different air temperatures. Thermodynamic properties associated with the drying process of this product were also determined. Corn ears with initial moisture content of 0.45 dry basis (kgw kgdm-1) were dried until they reached a final moisture content of 0.12 (kgw kgdm-1) at temperatures of 45, 55 and 65°C. Traditional models used to describe the drying process of several agricultural products were employed to fit the observed data of the drying process of corn ears. The effective diffusion coefficient (Def) was determined by means of an analytical solution of Fick’s second law. It was concluded that the Logarithmic model was the one that best fit the observed data...

Palavras-chave: 5.00.00.00-4; 5.03.00.00-8; 5.03.03.02-3 Zea mays; Mathematical models; Moisture content Ciências Agrárias; Engenharia Agrícola; Armazenamento de Produtos Agrícolas Zea mays; Mathematical models; Moisture content.

Ano: 2011

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/7079

Mesquite pod meal in sheep diet: intake, apparent digestibility of nutrients and nitrogen balance

Santos, Edileusa de Jesus do; Pereira, Mara Lúcia Albuquerque; Almeida, Paulo José Presidio; Moreira, Jeruzia Vitória; Souza, Andréia Carolina Santos de; Pereira, César Augusto Ramos.

Eight Santa Ines sheep were assigned to two 4 x 4 Latin squares, to evaluate the effects of replacing elephant grass silage with different levels of mesquite pod meal (MDM) (15, 30 and 45% DM) on intake, apparent digestibility of dry matter (DM), organic matter (OM), crude protein (CP), ether extract (EE), acid detergent fiber (ADF), neutral detergent fiber (NDF), total carbohydrates (TC) and non-fiber carbohydrates (NFC) and the nitrogen balance. There was a linear increase (p < 0.05) in the intake of DM, OM, CP, ADF, NDF, NFC and TC according to the addition of MPM to the diet. The digestibility of DM, OM and CP increased (p < 0.05) with the addition of MDM. We observed a positive linear effect (p < 0.05) for the nitrogen intake. The addition of...

Methods to determine forage intake by lambs on Italian ryegrass

Palavras-chave: 5.00.00.00-4; 5.04.00.00-2 forage conservation; Prosopis juliflora; Silage.

Ano: 2015

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/24466

Rosa, Aline Tatiane Nunes da; Rocha, Marta Gomes da; Pötter, Luciana; Graminho, Larissa Arnhold; Bergoli, Tuani Lopes; Moterle, Paulo Henrique.

This study was conducted to evaluate the use of chromium oxide and the content of fecal nitrogen to estimate forage intake by female lambs on Italian ryegrass pasture. The pasture was managed under different forage allowances (FA): 6, 9 and 12% BW. The experiment was a randomized split-split plot design, in which the forage allowances were considered as main plots, the phenological stages as subplots and methods to determine intake as sub-subplots. Forage intake, in the ryegrass vegetative stage, is independent of forage allowance. Lower allowances limit forage intake from the pre-flowering stage, while at the reproductive stage, intake was lower in FA6, intermediate in FA9 and higher in FA12. The estimation of organic matter intake by lambs on Italian...

Modeling of the shrinkage kinetics of coffee berries during drying - doi: 10.4025/actasciagron.v33i3.7080

Palavras-chave: 5.00.00.00-4; 5.04.00.00-2; 5.04.04.00-8 Lolium multiflorum Lam.; Fecal nitrogen; Lambs; Chromium oxide; Intermittent grazing..

Ano: 2015

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/28051

Oliveira, Gabriel Henrique Horta; Instituto Federal de Brasília; Corrêa, Paulo Cesar; Universidade Federal de Viçosa; Botelho, Fernando Mendes; Universidade Federal de Mato Grosso; Goneli, André Luis Duarte; Universidade Federal da Grande Dourados; Afonso Júnior, Paulo Cesar; Embrapa Café; Campos, Sílvia Carvalho; EMBRAPA Agrosilvipastoril.

The effects of drying conditions on the shrinkage of Coffea Arabica L., cultivar Catuaí Vermelho, were studied. An exponential model derived from the kinetic model was used to describe the shrinkage kinetics. In addition, an equation was proposed to describe the relationship between the superficial areas and weights of the coffee berries. Coffee berries were dried at temperatures (T) of 35, 45, 55 and 65ºC and at relative humidities (φ) of 25, 35, 45 and 55%, forming 16 different sets of conditions, with an initial moisture content for all conditions of 2.27 dry basis (d.b.), dried until 0.11 d.b. Changes in the product dimensions were measured continuously during drying. Surface area-to-volume ratio values increased with moisture content decrease. The...

Palavras-chave: 5.00.00.00-4; 5.03.00.00-8; 5.03.03.02-3 surface area-to-volume ratio; Post-harvest; Activation energy; Coffea arabica L; Shrinkage Ciências Agrárias; Engenharia Agrícola; Armazenamento de Produtos Agrícolas surface area-to-volume ratio; Post-harvest; Activation energy; Coffea arabica L; Shrinkage.

Ano: 2011

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/7080

Modeling the incidence of citrus canker in leaves of the sweet orange variety ‘Pera’

Pompeu, Danielle da Silva; Guedes, Terezinha Aparecida; Janeiro, Vanderly; Gonçalves-Zuliane, Aline Maria Orbolato; Nunes, William Mario de Carvalho; Carneiro, José Walter Pedroza.

Citrus canker, caused by the bacterium Xanthomonas citri subsp. citri, is one of the most important diseases of citrus. The use of resistant genotypes plays an important role in the management and control of the disease and is the most environmentally sustainable approach to disease control. Citrus canker incidence was recorded in an experiment on nine genotypes of the sweet orange variety ‘Pera’ grafted on four rootstocks. The experiment was started in 2010 and the incidence of citrus canker on the leaves was recorded on a quarterly basis. The incidence data from the experiment were analyzed using a zero-inflated Beta regression model (RBIZ), which is the appropriate method to describe data with large numbers of zeros. Based on the residual analysis, the...