The objective of this study is to determine the variability in soil type and soil solution chemistry of four pedons in a vineyard planted with Cabernet Sauvignon grapes, located in the Paso Robles wine growing AVA. The selected soils cover contiguous vineyard patches planted with the same cultivar, on its own roots. Furthermore, these vineyards contain vines of the same age, planted in 1989-1990, that have been treated with the same management practices. The soils have different chemical and physical properties and belong to the orders Alfisols, Mollisols and Vertisols. Soil moisture has been recorded throughout the growing season and soil samples have been collected to observe the evolution of soil solution characteristics. Vine growth parameters have been recorded along with leaf and petiole samples for tissue analysis. Nutrient balance in the soil solution has been characterized at the onset, mid-point and harvest time during the growing season and analyzed in relation to growth parameters and fruit yield. Soil solution activities of macronutrients such as K and NH4/NO3 are related to differences in soil pH, organic matter quality, and clay mineralogy. We are analyzing leaf tissue and berry concentrations of these elements and how they impact nutrient availability in the soil solution. This ongoing project has three main experimental objectives: 1) Characterize the activity of various inorganic macro and micronutrients in the four different soil types and relate them to soil pH, organic matter quality; 2) Understand how differences in soil physical and chemical properties affect grapevine growth and fruit yield and quality; 3) Relate soil-induced differences in grapevine chemistry, growth and fruiting characteristics to wine chemistry and quality.