Nitrogen fertilization of Cabernet Sauvignon grapevines: yield, total  nitrogen content in the leaves and must composition

Felipe  Lorensini; Carlos Alberto  Ceretta; Cledimar Rogério  Lourenzi; Lessandro  De Conti; Tadeu Luis  Tiecher; Gustavo  Trentin; Gustavo  Brunetto

Nitrogen fertilization of Cabernet Sauvignon grapevines: yield, total nitrogen content in the leaves and must composition

Autores

Felipe Lorensini

Carlos Alberto Ceretta

Cledimar Rogério Lourenzi

Editor

Universidade Estadual de Maringá

Descripción

Grapevines grown on sandy soils are subjecte d to the application of supplemental nitrogen (N); however, there is little information available rega rding the impact of these applications on yield, plant nutritional state and must composition. The aim of this study was to evaluate the yield, nutritional state and must composition of grapevines subjected to N fertilization. Cabernet Sa uvignon grapevines were subjected to annual applications of 0, 10, 15, 20, 40, 80 and 120 kg N ha -1 in 2008, 2009 and 2010. During the 2008/09, 2009/10 and 2010/11 harvest seasons, leaves we re collected during full flowering and when the berries changed color, and the total N content wa s analyzed. The grape yield and the enological characteristics of the must were evaluated. The resp onse to applied N was low, and the highest Cabernet Sauvignon grape yield was obtained in re sponse to an application of 20 kg N ha -1 year -1 . The application of N increased the nutrient content in the leaf collected at full flowering, but it had little effect on the total nutrient content in the must, and it did not affect the en ological characteristics of the must, such as soluble solids, pH, total acidity, malic acid and tartaric acid.