20 research outputs found

    Irrigation cutoff on 'BRS Clara' seedless grapevines during berry ripening stage.

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    The seedless table grape cultivar 'BRS Clara' (Vitis vinifera L.) presents yellowish-green berries and was developed for growing in tropical regions. In Brazilian tropical areas irrigation is usually an essential tool. Irrigation cutoff during berry ripening stage is sometimes adopted by grape growers to reduce water application and to increase water use efficiency. This study aimed to evaluate the response of 'BRS Clara' grapevines to irrigation cutoff during ripening stage. The experiment was carried out in Jales, SP, Brazil (20º16'S, 50º33'W, 483m), from June to October 2010, using ?BRS Clara? plants grafted on ?IAC-572? and conducted in a overhead trellis system. The vineyard was irrigated by microsprinklers and covered with polyethylene screen, that is a common practice in the region to protect the grapes against bat and bird attacks. The soil moisture conditions were monitored employing tensiometers installed at 15 cm and 45 cm deep. The experimental design was completely randomized with two treatments, with irrigation (CI) and without irrigation (SI) during fruit ripening. Production and fruit quality variables were evaluated including berry and bunch mass, yield per plant, diameter and length of berries, soluble solids and titratable acidity. There was no difference between treatments for all parameters evaluated. In irrigation treatment (CI) it was applied 41.9 mm during the ripening period, representing 16.1% of total irrigation. The soil water potential in the CI treatment stayed near field capacity, whereas the treatment without irrigation (SI) showed a decrease trend during part of the period, reaching values closed to 70kPa. This reduction did not affect subsequent culture performance. It must be considered, however, that rainfall occurrence was registered since the last week of September and during October, rewetting the soil and approaching the soil water potential values in both treatments.Resumo expandido apresentado no 18º Simpósio Internacional GiESCO, 7 a 11 de julho de 2013, Porto

    Coeficiente de cultura (Kc) para videira com e sem cobertura vegetal no solo.

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    A região noroeste de São Paulo é uma das principais produtoras de uvas de mesa do estado, sendo a ?Niágara Rosada? (Vitis labrusca) uma das cultivares que tem sido mais adotadas pelos produtores locais. Todos os vinhedos da região são irrigados, sendo que para o manejo correto da água faz-se necessária a estimativa da demanda hídrica do vinhedo. Essa estimativa é realizada, normalmente, multiplicando-se a evapotranspiração de referência diária (ETo) pelos coeficientes da cultura (Kc). Diversas variáveis afetam os valores de Kc como o estádio fenológico, o sistema de condução e a cobertura vegetal do solo, entre outras. O objetivo do presente trabalho foi determinar os valores do coeficiente de cultura (Kc) para videiras com e sem a presença de cobertura vegetal no solo. O experimento foi realizado no município de Jales, SP, de junho a outubro 2010. As plantas de ?Niágara Rosada? (Vitis labrusca), sobre porta-enxerto IAC-572, foram cultivadas em condições de campo, conduzidas no sistema latada cobertas com tela plástica que apresenta sombreamento de 18% e irrigadas por microaspersão. Dois tratamentos foram avaliados: sem cobertura vegetal, mantendo-se o solo permanentemente capinado; e com cobertura vegetal, deixando-se a vegetação espontânea se desenvolver. Os valores de Kc foram obtidos nos diferentes estádios fenológicos da cultura, por meio do balanço hídrico no solo. Em geral, os valores de Kc sem cobertura vegetal (KcS) apresentaram comportamento semelhante aos obtidos nas áreas com cobertura (KcC), sendo que a maior diferença ocorreu no período de desenvolvimento inicial dos ramos. Durante o ciclo da cultura, os valores de KcS variaram entre 0,32 e 0,86, com média igual a 0,53, enquanto que os valores de KcC variaram de 0,23 a 0,93, com média igual a 0,58

    Irrigation cutoff on 'BRS Clara' seedless grapevines during berry ripening stage.

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    The seedless table grape cultivar 'BRS Clara' (Vitis vinifera L.) presents yellowish-green berries and was developed for growing in tropical regions. In Brazilian tropical areas irrigation is usually an essential tool. Irrigation cutoff during berry ripening stage is sometimes adopted by grape growers to reduce water application and to increase water use efficiency. This study aimed to evaluate the response of 'BRS Clara' grapevines to irrigation cutoff during ripening stage. The experiment was carried out in Jales, SP, Brazil (20º16'S, 50º33'W, 483m), from June to October 2010, using ?BRS Clara? plants grafted on ?IAC-572? and conducted in a overhead trellis system. The vineyard was irrigated by microsprinklers and covered with polyethylene screen, that is a common practice in the region to protect the grapes against bat and bird attacks. The soil moisture conditions were monitored employing tensiometers installed at 15 cm and 45 cm deep. The experimental design was completely randomized with two treatments, with irrigation (CI) and without irrigation (SI) during fruit ripening. Production and fruit quality variables were evaluated including berry and bunch mass, yield per plant, diameter and length of berries, soluble solids and titratable acidity. There was no difference between treatments for all parameters evaluated. In irrigation treatment (CI) it was applied 41.9 mm during the ripening period, representing 16.1% of total irrigation. The soil water potential in the CI treatment stayed near field capacity, whereas the treatment without irrigation (SI) showed a decrease trend during part of the period, reaching values closed to 70kPa. This reduction did not affect subsequent culture performance. It must be considered, however, that rainfall occurrence was registered since the last week of September and during October, rewetting the soil and approaching the soil water potential values in both treatments.Made available in DSpace on 2016-02-23T06:50:35Z (GMT). No. of bitstreams: 2 CONCEICAOGIESCO2013.pdf: 215848 bytes, checksum: c275122f45efe3f0c55cee158a87602d (MD5) GiESCOcapaanais072013.pdf: 735573 bytes, checksum: 10731914e3be9e56e4f283b4d395db02 (MD5) Previous issue date: 2014-02-062013Resumo expandido apresentado no 18º Simpósio Internacional GiESCO, 7 a 11 de julho de 2013, Porto

    Suspensão da irrigação e rachadura de bagas em uvas "BRS Morena".

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    Suspensão da irrigação durante o período de maturação de frutos em videiras 'BRS Morena'.

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    O trabalho teve o objetivo de avaliar a resposta da videira 'BRS Morena' à suspensão da irrigação no período de maturação dos frutos. O experimento foi desenvolvido em Jales, SP, com plantas de ?BRS Morena? sobre porta-enxerto IAC-572, conduzidas no sistema latada e cobertas com tela de polietileno. Foram avaliadas variáveis de produção e de qualidade dos frutos para dois tratamentos: com e sem irrigação no período de maturação dos frutos. A suspensão da irrigação durante o período de maturação não afetou o desempenho da cultivar BRS Morena

    Efeito da umidade do solo na ocorrência de bagas rachadas da cultivar BRS Morena.

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    A região noroeste de São Paulo é um dos principais pólos produtores de uvas de mesa do Estado. Nessa região, o ciclo produtivo da cultura ocorre durante o período seco do ano, com o uso de irrigação. No entanto, é comum a ocorrência de precipitações pluviais durante a fase de maturação dos frutos. Nessa fase, a ocorrência de chuvas pode favorecer a rachadura das bagas, pelo excesso de água no solo. O objetivo do presente trabalho foi avaliar a interferência da umidade do solo, na fase de maturação, sobre o rachadura das bagas na cultivar BRS Morena (Vitis sp.).Resumo

    Endothelial progenitor cells and their potential clinical implication in cardiovascular disorders

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