With the lack of published research on biodynamic viticulture, Dr. John Reganold was eager to participate in a side-by-side comparison of organic and biodynamic viticulture in northern California at the McNab Ranch, owned by Jimmy Fetzer. The 150-acre vineyard was certified organic in 1996 when the study began, and certified by the Demeter Association as biodynamic in 1997. Reganold specifically wanted to measure the effects of the biodynamic preparations on soil quality and wine grape quality. Four randomized and replicated plots of biodynamic and organic vines were delineated within a 12-acre block of Merlot grapes. The soils were the same, […]