Composição química do mosto da uva 'cabernet franc' conduzida no sistema lira aberta

Abstract

The present work was carried out in order to evaluate the physicochemical composition of the must of cv. Cabernet Franc. It was carried out during the 1995/1996 vegetative cycle, in eight vineyards conducted in the lyre system and located in the communes of Bento Gonçalves and Monte Belo do Sul, Rio Grande do Sul–State, Brazil. The average values of the variables showed similar results to those previously determined in the same region with other trellising systems: ºBrix – 17.0; total acidity – 113 meq L–1; pH – 3.17; total nitrogen – 246.1 mg L–1; total polyphenols (I 280) – 11.8; proline – 182.2 mg L–1; tartaric acid – 88 meq L–1; malic acid – 56 meq L–1; K – 951 mg L–1; P – 71.3 mg L–1; Ca – 34.4 mg L–1; and Mg – 50.2 mg L–1. These results show that grapevines trellised in the lyre system may be recommended to produce 'Cabernet Franc' grapes regarding soil and climatic conditions of the Serra Gaúcha region.