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URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/3352
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Resultados da Pesquisa
Item Effect of indole-3-acetic acid on growth, physiology and nutritional status of young arabica coffee plants(Universidade Federal de Lavras, 2023-01-20) Erlacher, Wellington Abeldt; Amaral, José Francisco Teixeira do; Amaral, José Augusto Teixeira do; Christo, Bruno Fardim; Ferreira, Daniel Soares; Tatagiba, Sandro Dan; Rocha, Brunno Cesar Pereira; Tomaz, Marcelo Antonio; Rodrigues, Wagner Nunes; Partelli, Fábio LuizCoffee is one of the main agricultural commodities in the world. Thus, research aimed at reducing the productive risks of the crop has been increasingly encouraged, among which the use of plant hormones stands out. In addition, the objective of this work was to analyze the effect of the application of indole-3-acetic acid on the growth, nutrition and gas exchange of young Coffea arabica L plants. The experiment was carried out in the field in the city of Alegre, Espírito Santo, Brazil. The experimental design used was randomized blocks, testing the effect of the application of five doses of indole-3-acetic acid in young Arabica coffee plants, in four replications. The application of indole-3-acetic acid stimulates the growth rate of the stem diameter at a concentration of 60 mg L-1, as well as gas exchange in coffee plants, however it did not favor the increase in the substomatic concentration of CO2 instantaneous and intrinsic efficiency in water use and instantaneous carboxylation efficiency. Although the application of EIA was not able to provide direct gains in coffee growth during the experimental period, a longer evaluation of the treatments would possibly provide promising results for the coffee crop. The multivariate analysis showed that higher doses of auxin have a high relationship with the macronutrients studied.Item Nutritional characteristics of conilon coffee genotypes grown in transition altitude with water management in soil(Editora UFLA, 2021-10-27) Salles, Rodrigo Amaro de; Jordaim, Renan Baptista; Colodetti, Tafarel Victor; Rodrigues, Wagner Nunes; Amaral, José Francisco Teixeira do; Tomaz, Marcelo AntonioThe modification of water management in the Conilon coffee (Coffea canephora) crop is a possible strategy to improve nutritional management efficiency and ensure better use of the genotypes for regions of transitional altitude. The objective of this study was to evaluate the nutritional characteristics of 27 genotypes of C. canephora and submit them to two water management schemes in soil. The goal was to find evidence of higher leaf contents, exports, and nutrient recycling potential in the productive branches of various genotypes. The experiment was carried out in a randomized block design with three replications in a split-plot scheme. The treatment consisted of 27 genotypes of C. canephora and two water management schemes in soil (“Irrigated” and “Rainfed”). Nutritional content in leaves, exported by fruits, and pruned (leaves and stem of plagiotropic branches) recyclable contents were evaluated for nitrogen, phosphorus, potassium, calcium, and magnesium. Variations were observed among genotypes for all the parameters evaluated in both water management in soil. However, significant homogeneous groups were formed among the genotypes in the irrigated management. Furthermore, the genotypes showed distinct nutritional characteristics in response to water management in the soil. Genotypes 108 and 302 had higher nutritional content and were exported by fruits, regardless of soil water management.Item The management of orthotropic stems modulates the photosynthetic performance and biomass allocation of productive plants of Arabica coffee(Universidade Federal de Viçosa, 2020) Colodetti, Tafarel Victor; Rodrigues, Wagner Nunes; Brinate, Sebastião Vinícius Batista; Martins, Lima Deleon; Cavatte, Paulo Cezar; Tomaz, Marcelo AntonioDue to the possibility of enhancing the physiological responses by modulating the architecture of coffee trees, the objective of the study was to analyze the leaf gas exchanges and biomass allocation of Arabica coffee cultivated with different numbers of orthotropic stems. The experiment was carried out in a plantation located in Santa Teresa-ES, Brazil, cultivated with spacing of 2.5×1.0 m, using the cultivar Catuaí Vermelho IAC44. The gas exchange rates were monitored along stages of the phenological cycle (2014/2015), following a split-plot scheme, 3×3 (number of orthotropic stems per plant in three levels: 1, 2 and 3; and the phenological stages in three levels: flowering, fruit formation and maturation). The allocation of biomass in the plagiotropic branches was also analyzed during the phenological stage of fruit maturation. The management of the number of orthotropic stems affected the photosynthetic responses and biomass allocation of coffee trees. Under the studied conditions, cultivating the plants with two orthotropic stems created conditions which promoted the photosynthetic responses. Keeping more stems promotes the availability of leaves per amount of produced fruits in the plagiotropic branches, allowing the plant to sustain the production with less metabolic earing.Item Implications of the cut type and apex length of stem cuttings used for the production of plantlets of Conilon coffee(Editora UFLA, 2020) Verdin Filho, Abraão Carlos; Freitas, Silvio de Jesus; Comério, Marcone; Volpi, Paulo Sérgio; Colodetti, Tafarel Victor; Rodrigues, Wagner Nunes; Fonseca, Aymbiré Francisco Almeida da; Posse, Sheila Cristina Pruculi; Fontes, Alexandre Gomes; Christo, Bruno Fardim; Vieira, Luciano Junior DiasProducing plantlets of Conilon coffee within the specific recommendations and with a high level of quality is fundamental since it is capable of promoting the initial development of the crops. To identify the best protocol to prepare the stem cuttings is fundamental to the process of plantlet production of the species. In this context, this study aimed to evaluate the implications of the type of apex cutting and the length of the remaining apex of stem cuttings to produce plantlets of Conilon coffee (Coffea canephora). To this end, two trials were conducted in the Marilândia Experimental Farm (Instituto Capixaba de Pesquisa, Assistência Técnica e Extensão Rural, Marilândia-ES). The first trial evaluated the types of apex cutting (straight or bevel cut), and the second trial studied the different lengths of the remaining apex (0.5, 1.0, 1.5, 2.0, and 2.5 cm). Characteristics of the vegetative growth and photosynthetic traits of the plantlets of Conilon coffee were evaluated after 120 days of cultivation in a nursery. The biomass accumulation of the plantlets of Conilon coffee produced by stem cutting may be favored by the use of bevel cut on the apex. The length of the remaining apex does not seem to have a expressive effect over the quality or growth of the plantlets, being only possible to observe effects for leaf area and biomass accumulation.Item Impact of drying methods over the germinative potenti al of conilon coffee of late maturation(Editora UFLA, 2019-10) Posse, Sheila Cristina Prucoli; Rodrigues, Wagner Nunes; Comério, Marcone; Volpi, Paulo Sérgio; Verdin Filho, Abraão Carlos; Posse, Robson Prucoli; Oliveira, Vinicius de Souza; Arantes, Sara DousseauThis study aimed to evaluate the effect of different drying methods (regarding temperature and drying time) over the seed moisture and germination of seeds of Coffea canephora, harvested from genotypes of late maturation. For this end, seeds from selected genotypes were harvested and dried using two different methods: drying at 25 ˚C with natural circulation of air and drying at 35 ˚C with artificial circulation of air. The seeds were evaluated to quantify the loss of moisture content, and their germinative potential was assessed by parameters of germination speed, and the proportion of seedlings with healthy germination originated from them. The results show it is possible to apply different drying methods; using different systems, temperatures and times of exposure; to decrease the moisture content of seeds of C. canephora, from 50% (freshly harvested seeds from genotypes of late maturation, in July) to under 18% (dried seeds). Even if the initial stages of the drying process, while the seeds still present high moisture content, are similar for both methods, the method with artificial circulation of air at 35 ˚C promotes the drying speed and is able to achieve the lower levels of seed moisture using less than half of the time required by method with natural circulation of air at 25 ˚C. This faster moisture removal, however, has negative impacts over the germinative potential of the seeds, which are not observed for seeds subjected to the slow natural drying.Item Arquitetura da copa do cafeeiro arábica conduzido com diferentes números de ramos ortotrópicos(Universidade Federal de Viçosa, 2018-09) Colodetti, Tafarel Victor; Tomaz, Marcelo Antonio; Rodrigues, Wagner Nunes; Verdin Filho, Abraão Carlos; Cavatte, Paulo Cezar; Reis, Edvaldo Fialho dosO estudo do comportamento do cafeeiro arábica conduzido com mais de um ramo ortotrópico surge como fonte de alternativas de melhoria da arquitetura da copa e da produção da lavoura cafeeira. Por isso, objetivou-se, com este trabalho, analisar a arquitetura da copa do cafeeiro arábica conduzido com diferentes números de ramos ortotrópicos por planta. Um experimento foi realizado em campo, no município de Santa Teresa, ES, em altitude de 740 m, topografia ondulado-acidentada, com precipitação e temperatura média anual de 1.282 mm e 21,1 oC, respectivamente. O espaçamento foi de 2,5 x 1,0 m e o cultivar foi o Catuaí Vermelho IAC44. Em novembro de 2012, aos oito anos de idade, a lavoura foi recepada e as brotações que surgiram foram conduzidas para promover o estabelecimento de três tratamentos referen- tes ao número de ramos ortotrópicos: um, dois ou três ramos por planta. O experimento seguiu delineamento em blocos casualizados, com oito blocos e os três tratamentos. Plantas de cafeeiro arábica com dois ou três ramos ortotrópicos não se diferiram e apresentaram maior área e volume de copa, densidade de enfolhamento e área foliar dos ramos plagiotrópicos. A condução do cafeeiro arábica com dois ramos ortotrópicos por planta proporcionou maior produção de café beneficiado por hectare, bem como maior proporção de grãos graúdos (grãos maiores e com massa mais homogênea).Item Eficiência de absorção e utilização de boro, zinco, cobre e manganês em mudas enxertadas de cafeeiro(Universidade Federal de Viçosa, 2011-01) Tomaz, Marcelo Antonio; Martinez, Hermínia Emilia Prieto; Rodrigues, Wagner Nunes; Ferrari, Rafael Binda; Pereira, Antônio Alves; Sakiyama, Ney SussumuO estudo da eficiência nutricional de plantas enxertadas de cafeeiro é importante para a seleção de combinações enxerto/porta-enxerto, visando atingir melhor desenvolvimento e produção. Este trabalho teve como objetivo avaliar as diferenças na eficiência de absorção e utilização de B, Zn, Cu e Mn em mudas enxertadas de cafeeiro. O experimento foi conduzido em vasos de 20 litros contendo como substrato terra, areia e esterco na proporção de 3:1:1, onde as plantas permaneceram por um período de 18 meses. Utilizaram-se como enxerto quatro genótipos de Coffea arabica L.: os cultivares Catuaí-Vermelho IAC 15 (‘Catuaí 15’) e Oeiras MG 6851 (‘Oeiras’) e os híbridos H419-10-3-4-4 (‘H419’) e H514-5-5-3 (‘H514’) do programa de melhoramento da EPAMIG/UFV. Como porta-enxerto foram empregados cinco progênies de famílias de meio-irmãos de clones de Coffea canephora Pierre ex Froenher cv. Conilon: ES 21, ES 36, ES 26, ES 23 e ES 38 do programa de melhoramento de café robusta do Incaper. O delineamento experimental foi inteiramente casualizado, com 24 tratamentos e três repetições, sendo quatro pés-francos e 20 combinações de enxertia. A eficiência nutricional das plantas variou conforme a combinação enxerto/porta-enxerto. O cultivar Oeiras não foi beneficiado por nenhuma enxertia, apresentando redução da produção total de matéria seca em todas as combinações comparativa- mente ao respectivo pé-franco. O cultivar Catuaí 15 foi mais eficiente na produção de matéria seca e utilização de B e Zn quando combinado com os materiais genéticos de conilon ES 26 e ES 23.Item Conilon coffee yield using the programmed pruning cycle and different cultivation densities(Editora UFLA, 2014-10) Verdin Filho, Abraão Carlos; Tomaz, Marcelo Antonio; Ferrão, Romário Gava; Ferrão, Maria Amélia Gava; Fonseca, Aymbiré Francisco Almeida da; Rodrigues, Wagner NunesDetermining the correct population of plants and number of orthotropic stems to be kept per area, along with optimal pruning management, is very important for crops of Coffea canephora. The aim of this work was to improve conilon coffee cropping management, evaluating the influence of the programmed pruning cycle with different combinations of spacing and numbers of orthotropic stems per plant on crop yield. Two experiments were carried out: one with smaller spacing and lower numbers of stems per plant, and another with larger spacing and higher numbers of stems per plant. Both assays followed a triple factorial scheme 2 x 3 x 4 (2 spacing x 3 numbers of stems per plant x 4 harvests) in a random block statistical design, using four replications and 11 plants pen plot. The results show that a reduction in spacing associated with an increase in number of stems per plant has a positive effect on the conilon coffee yield.Item Estimativa de parâmetros genéticos de grupos de clones de café conilon(Editora UFLA, 2012-05) Rodrigues, Wagner Nunes; Tomaz, Marcelo Antonio; Ferrão, Romário Gava; Ferrão, Maria Amélia Gava; Fonseca, Aymbiré Francisco Almeida da; Miranda, Fábio Demolinari deO cultivo de Coffea canephora var. kouilouensis De Wild (Conilon) é de grande importância no Espírito Santo e suas populações, normalmente, apresentam expressiva variabilidade genética. Objetivou-se, neste trabalho, a avaliação de três grupos de genótipos de café Conilon, distintos de acordo com seus ciclos de maturação, para a estimativa de parâmetros genéticos de diferentes características agronômicas, visando conhecer melhor sua estrutura genética. Foram realizadas estimativas de parâmetros genéticos obtidas em três experimentos dispostos de acordo com o delineamento estatístico em blocos casualizados, com quatro repetições e cinco plantas por parcela experimental. Foram feitas análises de variância individuais e conjuntas para estimar parâmetros genéticos e inferir sobre a variabilidade genética de seis características agronômicas: ciclo de maturação, produtividade, índice de avaliação visual, vigor, porte e tamanho de frutos. Os resultados indicam que os grupos de clones estudados apresentaram alta produtividade e grande variabilidade genética quanto à maioria das características, não ocorrendo tendência de superioridade de um grupo de clones em relação ao outro. Os grupos de genótipos de café Conilon avaliados no presente estudo, apresentaram grande potencial para serem utilizado com êxito em programas de melhoramento genético, visando à produtividade e as demais características, no sul do Espírito Santo.