Aspectos produtivos e de qualidade de uvas de mesa sob as condições de clima do Semiárido Potiguar, Rio Grande do Norte

The present study was developed with the aim of recommending commercial plantations of table grape cultivars for a non-traditional region in viticulture, as in the Potiguar Semi-arid, and had the objective of evaluating the productive and phenological aspects of the' Italy improved 'and' Isabel precocious 'cultivars in different types of rootstocks. The experiment was installed at the Rafael Fernandes Experimental Farm of the Universidade Federal Rural do Semiárido (UFERSA) in a wide Y system, spaced 3m x 2m, with a drip irrigation system, with three rootstocks and two canopy cultivars, for a period of 2 years. A randomized block design was used in a 3 x 2 factorial scheme, with three rootstock cultivars (IAC 313 `Tropical ', IAC 572' Jales' and IAC 766` Campinas) and two canopy cultivars ('Italy improved' and 'Isabel precocious'), with five plants per portion, organized into six treatments and six replicates. With the sequence of the prunings and harvests the results of three cycles of 'Isabel precocious' production and two of 'Improved Italy' were obtained. After a period necessary to guarantee better plant vigor, a new cycle was organized for the collection and analysis of productivity data. Data were submitted to analysis of variance (F test) at the 0.01 and 0.05 significance levels, and the means were compared by the Tukey test, at a 5% rate probability, using the SAS / STAT Software ( SAS Institute, 2012). Because it is a non-traditional region for grapevine cultivation, we opted for the study of phenology in the production process, the effects of climate through bioclimatic indicators, such as day degrees (GD) and heliothermal index of Geslin (IHG) , and the analysis of the quality of the fruit during its development (PC: bunch weight, CC: bunch length, DC: bunch diameter, NB: number of berries, PB: berry weight, CB: berry length, DB : berry diameter) and post-harvest (Soluble Solids-SS, Titratable Total Acid-ATT and SS / ATT ratio). The obtained results led us to conclude that in the climatic conditions of the Potiguar semi-arid region the production of table grapes, 'Italy improved ' and 'Isabel precocious' cultivars finds favorable environment for commercial production, producing grapes of good quality for the market, independent of the types of rootstock tested