Effects on The Yield and Quality of Grape Juice in Merlot Grape Varieties Foliar Fertilizer Application

Abstract

Experiments were carried out in Sarkoy-Tekirdag, one of the prominent centers of viticulture in the Marmara Region of Turkey on the cultivars Merlot, grapevine cultivar grown on slightly basic soils containing also lime, were used in the experiments at 2007-2008. The K, Mg and the micro elements (Fe, Zn, Cu and Mn) were combined in three different concentrations on development of grape fern applied as foliar fertilizers at two development stages. In the study, it is aimed to investigate foliar fertilizer applications of the grape must quality criteria which are pH, amount of soluble dry solids %, alcohol percentage %, total sugar %, titratable acid content g/L, total phenolic content, total anthocynanins mg/kg and tannens mg/kg. At the end of a two-year of trial, the effect of variations on pH, soluble dry solids, alcohol concentration, total sugar content, titretable acidity, total phenolic compounds, total anthocyanin and tannens were appeared to be statistically significant at 1 % level on the study of time of application, fertilizer concentrations and the triple interaction of merlot grapevine cultivar.