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iii COMMITTEE MEMBERSHIP TITLE: Impact of marine extracts applications on cv. Syrah grape (Vitis vinifera L.) yield components, harvest juice quality parameters, and nutrient uptake AUTHOR: ABSTRACT Impact of marine extracts applications on cv. Vineyard management practices have an impact on grape berry development in ways that influence the quality of wine made from those grapes. The goal of this study is to determine whether exogenous applications of marine extracts on Syrah grapes can influence yield components, harvest juice quality parameters, and nutrient uptake. Obispo campus received individual doses of marine extract via fertigation at berry set and veraison proportional to the amount they would receive on an annual per-acre basis. In 2011, marine extracts were also applied as foliar treatments. Treatments were analyzed for the effects on TSS, pH, TA, anthocyanins, tannins, fruit yield per vine, clusters per vine, average berry weight, cluster weight, berries per cluster, vegetative yield, and nutrient uptake. The marine extracts did not have any significant effects on yield components, harvest juice quality, or nutrient uptake at any point in this experiment. Therefore, there appears to be no benefit to applying these products in Syrah grapes growing in heavy clay soil in cool-climate conditions. Table 3.1. Effect of fertigation treatment on harvest juice TSS (°Brix), pH, TA 41 (g/100ml), sugar-to-acid ratio (TSS: TA), anthocyanins (mg/L), tannins (mg/L), Table 3.2. Effect of fertigation treatment on clusters per vine, berries per cluster, 41 cluster weight (g), average berry weight (g), fruit yield per vine (kg), vegetative yield per vine, and Ravaz Index of Syrah grapes Table 3.3. Effect of fertigation treatment on fruit yield per vine (kg), clusters per 42 vine, berries per cluster, cluster weight (g), average berry weights (g), and rachis lengths (mm) of fertigation-treated Syrah grapes harvested on 1 August 2011 from Table 3.4. Effect of foliar treatment on fruit yield per vine (kg), clusters per vine, 42 berries per cluster, cluster weight (g), average berry weights (g), and rachis lengths (mm) of foliar-treated Syrah grapes harvested on 1 August 2011 from Trestle Table 3.5. Effect of fertigation by treatment and year on fruit yield per vine (kg), 43 clusters per vine, berries per cluster, cluster weight (g), and average berry weights (g) of Syrah grapes harvested on 1 August 2011 from Trestle Vineyard, California