Wesley Alves Martins
Abstract:
The experiment was carried out in Santa Rita do Araguaia - Goiás, Brazil, in a commercial orchard installed at Sperafico Farm, with a total area of 1.7 ha, located on the BR-364 highway, km 372 towards Goiânia-Cuiabá. The experiment was conducted with the 'Niagara Rosada' grapevine from October 2007 to October 2008. Aimed to study the characteristics of Niagara Rosada (Vitis labrusca L.) grape cultivation under ten seasons. pruning in the municipality of Santa Rita do Araguaia - GO. The productive cycle duration (pruning - harvest) ranged from 121 to 141 days for the 10 pruning seasons. Pruning times showed differences in the sum of degree days required to complete the cycle at the same location. Pruning times did not significantly affect the shape of the bunches, however, significantly affected the size of the bunches, with greater emphasis on the E9 (10/05/08) with 11.60cm and E10 (24/05/08) seasons. The largest berry diameter was found in pruning E1 (24/10/07) and E2 (09/11/07) with averages of 18.60mm and 18.0mm respectively, averages considered adequate for Niagara Rosada. The different pruning times influenced the soluble solids contents, with a higher average of 17.40 ºBrix for E8 season (26/04/08). However, there was significant variation in titratable acidity, and for pH, the highest value was 4.0, in pruning E8, E9 and E10. The highest yield was verified for E7 (03/28/08) with 12.63 t/ha and E10 (05/24/08) with 12.12 t/ha. Knowing the thermal requirement and cycle of the Niagara Rosada vine in Santa Rita do Araguaia, it's possible to estimate the date on which each of the phenological subperiods will occur and to predict the harvesting season.
