The aim of this study was to evaluate the effects of green prunings on two consecutive years to obtain a second harvest of 'Niagara Branca' (Vitis labrusca) grapevine in the same season. The experiment was carried out at Estação Experimental Agronômica of Universidade Federal do Rio Grande do Sul, located at Eldorado do Sul, State of Rio Grande do Sul, Brazil in 2003/2004 and 2004/2005 growth seasons. The grapevines were conducted by cordon training. The treatments involved three dates of green pruning, performed at fourth leaf situated above the last grape, and two seasons. All the plants were sprayed with hidrogenate cianamide (2%) to overcome dormency. Fenology, plant production, weight of grapes, °Brix and titratable acid were evaluated. The green pruning time season did not affect the Niagara production and quality of grapes in the first harvest, only delaying it by one week. The green pruning performed at the beginning of November provided a second harvest, between March and April, that is an alternative to offer grapes out of season.
prunning management; Vitis labrusca; pheenology; plant production
