Compost is an acceptable amendment for blueberry plants, but it's important to test it before you apply it. Pay attention to pH and nutrient levels, and watch out for weeds.
This article describes how to determine vineyard nutrient needs through tissue and soil sampling.
While the type of soil is important, location takes precedence when starting a vineyard for wine production.
Certain varieties grow best in the Pacific Northwest
Information on vineyard water management, focusing on when to initiate irrigation.