Épocas de poda na videira Niagara Rosada em Santa Rita do Araguaia - GO

Abstract

The experiment was carried out in Santa Rita do Araguaia Goiás, in a commercial orchard settled in the Sperafico Site, with total area of 1,7 ha, placed on BR-364 Rd, Km 372, from Goiânia to Cuiabá. This trial with the grapevine Niagara Rosada was done from October 2007 to October 2008. The aim of the research was to study the characteristics of the cultivar Niagara Rosada (Vitis labrusca L.) undergone ten pruning times in Santa Rita do Araguaia GO. The cycle duration (pruning harvest) varied from 121 to 141 days for the 10 pruning times. The pruning times presented differences in the sum of degree-days needed to complete the cycle in the same site. The pruning times did not affect the form of the bunches significantly. Nevertheless, they affected the size of the bunches significantly, especially pruning time P9 (5/10/2008) with 11,60cm and P10 (5/24/2008). The largest berry diameter was found in the pruning times P1 (10/24/2007) and P2 (11/09/2007), with 18,60mm and 18,0mm respectively, patterns considered appropriate for cultivation of Niagara Rosada . The different pruning times showed influence on soluble solids levels, with the highest average of 18.4 ºBrix for pruning time P8 (4/26/2008). However, there was significant variation for the acidity titratable, and for the Ph, the highest value was 4.0, in pruning times P8, P9 and P10. The highest yield was obtained in pruning times P7 (3/28/2008) with 12,63 t ha and P10 (5/24/2008) with 12,12 t ha. Taking into account the thermal requirements and the cycle of the grapevine Niagara Rosada in Santa Rita do Araguaia, it is possible to estimate the date for each of the phenological sub- periods, as well as to predict harvest time.