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Este trabalho visou quantificar as reservas nos ramos e avaliar o vigor vegetativo e rendimento de videiras ‘Niagara Branca’, ‘Niagara Rosada’ e ‘Concord’ submetidas a duas safras de uva por ciclo vegetativo. As plantas foram submetidas à poda de inverno (PI), em cordão esporonado, e à poda verde (PV) no final da primavera, através de desponte dos sarmentos a partir da quarta gema acima do último cacho. Os tratamentos foram: Testemunha 1 (PI em 20-07-07/sem PV), Testemunha 2 (PI em 22-08-07/ sem PV), T1 (PI em 20-07-07/poda verde em 15-11-07), T2 (PI em 20-07-07/PV em 17-12-07); T3 (PI em 22-08-07/PV em 15-11-07) e T4 (PI em 22-08-07/PV em 17-12-07). Avaliaram-se a produção por planta de ambas as safras, o índice de área foliar (IAF) ao longo do ciclo vegetativo e o conteúdo de reservas nos ramos nas seguintes épocas: PI de 2007, floração da primeira safra, PV em 15-11-07, PV em 17-12-07, pós-colheita da primeira e segunda safra e PI de 2008. A execução de uma PI associada a uma PV permitiu a obtenção de duas safras de uva por ciclo vegetativo, sendo mais efetiva no T3. As brotações emitidas pela PV provocaram mudanças no IAF e afetaram a dinâmica de síntese/consumo de reservas nos ramos das plantas. Nas videiras com PV houve redução no teor de reservas ao final do ciclo da cultura, se comparadas às plantas testemunhas. O manejo da poda para obtenção de duas safras aumenta a produção anual, porém acarreta redução no teor de reservas das plantas.This study evaluated the content of reserves in the branches and assessed the vegetative vigor and yield of Niagara Branca, Niagara Rosada and Concord grapevines submitted to two harvests per vegetative cycle. The plants were subjected to a winter pruning (WP) performed by means of a short pruning, and to a green pruning (GP) at the end of spring performed by pruning branches from the fourth bud above the last grape cluster. The treatments included Control 1 (WP on 07-20-07/no GP), Control 2 (WP on 0-22-07/no GP), T1 (WP on 07-20-07/GP on 11-15-07), T2 (WP on 07-20-07/GP on 12-17- 07), T3 (WP on 08-22-07/GP on 11-15-07) and T4 (WP on 08-22-07/GP on 12-17-07). The variables evaluated included grapevine production for the two crops, the leaf area index (LAI) throughout the vegetative cycle, and the content of reserves in the branches in the following stages: 2007 WP, first crop flowering, GP on 11-15-07, GP on 12-17-07, post-harvest of first and second crop, and 2008 WP. The WP associated to GP allowed to obtain two harvests in all cultivars being more effective in the T3. The shoots emitted by GP caused changes in the LAI and affected the dynamic of synthesis/ consumption of reserves in the branches of the grapevines. In plants with GP, there was reduction in the content of reserves at the end of the crop cycle compared to control plants. The pruning management to obtain two annual crops increased the annual production, but reduced the level of reserves of the grapevines

Conteúdo de reservas, vigor vegetativo e rendimento de videiras submetidas a duas safras por ciclo vegetativo