Potencial agronômico da interação clones / porta-enxerto na cultivar tannat em Dom Pedrito-RS

Abstract

The Tannat variety has its center of origin in France, in the Madiran region, and today is one of the most important for Uruguay being the main cultivated dark-skinned grape. It's a medium-vigor variety, very productive and presents good potential in the “Campanha Gaúcha” region. Within the world viticulture, the importance of studies in the qualitative scope of a cultivar in each region where it is inserted, however, studies on the behavior of the Tannat variety that seeks to potentiate its cultivation in the “Campanha Gaúcha” is still scarce even if this cultivation has great potential for the Pampa biome. Therefore, this work aims to evaluate the agronomic responses of different rootstocks and clones of the Tannat variety, in Dom Pedrito-RS vineyard, located in the region of the “Campanha Gaúcha”. For this purpose the experiment was conducted in the 2016/2017 harvest in a commercial vineyard with six treatments and three replicates: T1 - rootstock '3309C' and clone 944; T2 - and rootstock 'SO4', Californian clone; T3 - rootstock ‘Gravesac’ and Californian clone; T4 -'Gravesac' and Clone 717 rootstock; T5 - 'Gravesac' rootstock and clone 398; T6 - 'Gravesac' rootstock and clone 794; It was evaluated the technological maturation and agronomic monitoring, through collection of grape berries in three occasions during the period of maturation of the grape. As for the technological maturation, the '3309C' rootstock on clone 944 (T1) was the one that obtained the highest total soluble solids with 24.23 ° Brix and the lowest titratable acidity was the T6- gravesac 'under clone 794, with 5,61g.L-1 expressed in sulfuric acid, all of which had a satisfactory general evolution, overall evolution and for agronomic monitoring, all treatments behaved in uniform ways and the clone combination 794 , grafted on 'Gravesac', which obtained the highest productivity, of 10,953,25kg, the others being equally satisfactory. Compared in general, a treatment with a better oenological purpose is T1: rootstock '3309C' under clone 944. It was observed that although the wine year was one year atypical of temperatures and rains out of epochs, the Tannat variety has evolved satisfactorily, demonstrating the potential in Dom pedrito - RS.