Determinação de índice biometeorológicos da videira Niagara Rosada (Vitis labrusca L.) podada em diferentes épocas e fases do ciclo vegetativo / Biometeorological indexes determination for grape Niagara Rosada (Vitis labrusca L.) pruned at different seasons and physiological phases

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The goal of this work was to determine four biometeorological indexes: degreedays (DD), Primault s biometeorological index (BI), Huglin s heliothermal index (HI) and Geslin s heliothermal index (GHI) for grape Niagara Rosada (Vitis labrusca L.) pruned at different seasons and physiological phases. The dry pruning was done at the end of winter (carbohydrate mobilization phase) and green pruning (carbohydrate stock phase) was done during summer. The experiment was carried out in a randomized block design consisting of 9 treatments, pruning dates 20th July, 04th August, 19th August, 03rd September, 18th September, 01st February, 15th February, 02nd March and 16th March during two years (2005/2006 and 2006/2007). Twelve plants were used as experimental plot, being two border plants. The grapevine was 13 years old grown under trellis system with a 2.0 x 1.0 meter spacing under irrigation. The grape phenology was evaluated considering numbers of days for each one of the following period and sub-periods: pruning - harvest, sprout - harvest, pruning - sprout, sprout - flowering, flowering - early ripening and early ripening - harvest. To analyze those indexes, the Tukey test was used comparing pruning dates and F test for orthogonal contrast comparing plants pruned at different seasons (dry pruning versus green pruning). It was observed that plants pruned at different seasons do not require the same amount of energy to complete pruning - harvest period when using DD and HI. The same tendency was observed when using BI and GHI for those plants to complete its period sprout - harvest. Some sub-periods that did not differ statistically between dry pruning and green pruning: flowering - early ripening for BI and sprout - flowering for HI and GHI. Other sub-periods differ statistically when using F test for orthogonal contrast.

ASSUNTO(S)

degree-day primault s biometeorological index huglin s heliothermal index biometeorologia - Índices dry pruning green pruning uva grape poda geslin s heliothermal index.

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