Periódicos
URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/3352
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Resultados da Pesquisa
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 Microclimatic characterization of conilon coffee cultivate dinnorth-south alignment in northen Espírito Santo state, Brazil(Editora UFLA, 2019-10) Bis, Ana Paula Pereira; Partelli, Fábio Luiz; Rodrigues, Weverton Pereira; Falqueto, Antelmo Ralph; Espindula, Marcelo Curitiba; Martins, Lima DeleonThe objective in this work was to study the influence of the North-South plantation alignment with respect to microclimatic, growth, and mineral nutrition conditions in order to quantify the variables and to point out possible consequences for the coffee tree. The experiment was carried out in a 6-year-old conilon coffee (Coffea canephora) crop with a mean height of 1.6 m, cultivated in full sun and spaced 3.5 m x 1.0 m. The data were collected on four dates from December 2016 to September 2017 in North Espírito Santo State, Brazil. The irradiance, air temperature, and vapor pressure deficit variables were quantified by means of external data loggers. The leaf temperature was determined by means of thermal images, and the plant growth and nutrient concentration in the leaves on both sides of the plant (East and West) were evaluated. The West side of the plant showed higher values of irradiance, temperature, and vapor pressure deficit in the afternoon, reaching a difference of 5°C between the two sides. The leaf temperature had similar behavior to air temperature, reaching a difference of approximately 12°C between the two sides in the afternoon. Although significant differences were observed for some nutrients between the sides of the plant, macro and micronutrient leaf contents remained within the range considered adequate for the coffee tree.Item Efficiency and response of conilon coffee clones to phosphorus fertilization(Universidade Federal de Viçosa, 2013-05) Martins, Lima Deleon; Tomaz, Marcelo Antonio; Amaral, José Francisco Teixeira do; Bragança, Scheilla Marina; Martinez, Herminia Emilia PrietoStudies on nutritional efficiency of phosphorus in conilon coffee plants are important tools to unravel the high limitation that natural low levels of this nutrient in soil impose to these species cultivars. Therefore, this study aimed at evaluating the nutritional efficiency and the response to phosphorus of conilon coffee clones. Plants were managed during 150 days in pots containing 10 dm 3 of soil, in greenhouse. A factorial scheme 13 x 2 was used, with three replications, being the factors: 13 clones constituting the clonal cultivar “Vitória Incaper 8142” and two levels of phosphate fertilization (0% and 150% of the P2O5 usualy recommended), in a completely randomized design (CRD). The results indicate a differentiated response of dry matter production and of phosphorus content on each level of phosphate fertilization for the conilon coffee clones and that CV-04, CV-05 and CV-08 clones are nutritionally efficient and responsive to the phosphate fertilization.