RESUMOAs características ambientais e a exposição das plantas e frutas à insolação podem influenciar no crescimento das plantas e qualidade da produção. O trabalho foi realizado em um pomar comercial, com o objetivo de avaliar as características físico-químicas em relação à disposição na copa de frutas de tangerineira 'Ponkan', submetidas ao raleio químico. Foram avaliados quatro tratamentos, dispostos em esquema fatorial 2 x 2, no delineamento de blocos casualizados, com oito repetições. Os fatores foram as concentrações de Ethephon, 0 e 600 mg L -1 e dois quadrantes de localização das frutas na copa, leste e oeste. As frutas de tangerineira 'Ponkan', localizadas no quadrante oeste da copa, apresentaram tamanho e teor de sólidos solúveis maiores e menor acidez, quando comparadas com aquelas do quadrante leste. A aplicação de Ethephon para promover o raleio químico melhorou a qualidade das frutas de tangerineira 'Ponkan' em todas as posições analisadas na copa. Termos para indexação:Citrus reticulata, Ethephon, qualidade de frutas. ABSTRACTPlant growth and production quality can be influenced by environmental characteristics and sunlight exposure of plants and fruits. The objective of this study was to evaluate physico-chemical characteristics in relation to canopy distribution of 'Ponkan' mandarin fruits submitted to chemical thinning in a commercial orchard. Four treatments were tested, set in 2 x 2 factorial scheme with eight randomized block replications. The factors were Ethephon concentrations (0 and 600 mg L -1 and two quadrants of canopy fruit distribution (east and west). The 'Ponkan' mandarin fruits located in the west quadrant presented greater size and solid soluble content and lesser acidity, as compared to those in the east quadrant. Chemical thinning with Ethephon application improved the quality of the 'Ponkan' mandarin fruits in all the canopy positions analyzed. INTRODUÇÃOO tamanho das frutas de tangerineira 'Ponkan' (Citrus reticulata Blanco) e suas características organolépticas são determinados por um conjunto de fatores externos, relacionados às condições edafoclimáticas e internos, que envolvem as relações fonte-dreno durante as fases de crescimento, de maturação e de amadurecimento das frutas.Entre as variações climáticas, a exposição da planta e das frutas à insolação pode influenciar no seu crescimento e qualidade (Albrigo, 1992). Entretanto, nem todo efeito da incidência lumínica sobre a qualidade das frutas é decorrente do melhor suporte fotossintético para acumulação de açúcares. Podem ser decorrentes do estresse hídrico, resultando numa menor diluição de sólidos solúveis em áreas com maior exposição à radiação solar, entre outros (Albrigo, 1993). Além disso, a disponibilidade de água, o estresse térmico, a localização do fruto na copa, associado às práticas de manejo do pomar influenciam o desenvolvimento, florescimento e frutificação dos citros, resultando em diferentes respostas da planta em relação à produção e à qualidade (Krajewisk & Rabe, 1995).A resposta distinta quanto ao d...
In Brazil winemaking is expanding not only in the renewal of vineyards in traditional production areas, but also in the introduction of new crops in the newer winemaking regions. Promising characteristics were observed in the quality of the grapes and wines produced in altitude regions of Santa Catarina. The aim of this study is to characterize the geographic and climatic conditions which affect the phenology and vegetative growth of grapevine in São Joaquim, in the mountains region of Santa Catarina. The vineyards are located in areas with undulated and strongly undulated relief, predominantly in soils originating from basaltic rocks, in climate conditions classified as Cfb according to the Köppen, as Region I according to Winkler classification. The phenological stage of the grapevines in the São Joaquim region begins later and lasts longer in comparison to other winegrowing regions in Brazil. Decrease in photoperiod and low temperatures (<10˚C) were the determining factors for the induction of growth cessation of the shoots in São Joaquim. The geographic location in a lower latitude and its high altitude results in a distinct growing climate compared to the other winegrowing regions in Brazil.
RESUMO - PROHEXADIONE-CALCIUM AND VIGOR REDUCTION, PRODUCTIVITY AND QUALITY OF GRANO D'ORO GRAPEVINESABSTRACT -Prohexadione-calcium is a gibberellin biosynthesis inhibitor used to suppress the vegetative growth. The objective of this work was to evaluate the effect of prohexadione-calcium on vigor reduction, productivity and quality of Grano d'Oro, a mutation of Bordô (Vitis labrusca L.) grapevine. Apogee ® was used at a concentration of 250 mg L -1 of Prohexadione-calcium in different spray dates. The treatments were applied at full bloom, 45 days after full bloom and a control (no application). The experimental design was a completely randomized blocks design, with four blocks and 20 plants per plot. Marked branches were measured to assess the growth curve. During harvest, the bunch number per plant, productivity (kg plant -1 and T ha -1 ), 50 berries weight, berry number per cluster, total soluble solids (°Brix), total acidity (meq L -1 ) and pH were determined. Prohexadione-calcium application at full bloom reduced branch growth in 33% at the 15 th day after full bloom, this reduction decreased over the cycle, and at the 93 th day after full bloom reached 8%, compared to the other treatments. Prohexadione-calcium application at full bloom caused the higher vigor reduction and the higher productivity increase in Grano d'Oro grapevines. The productivity increase and the vigor reduction ran parallel to a total soluble solids reduction. The vigor reduction did not eliminate the need for shoot topping.
RESUMO O trabalho objetivou avaliar o efeito de doses crescentes do forchlorfenuron associado ou não ao ácido giberélico sobre componentes físico-químicos da uva 'Centennial Seedless' para
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