Wow, Bob. Relax. I'm sorry I pissed you off; it was not my intention. The Cox reference, if I remember correctly, is when he is discussing his personal experience with a master wine grape grower who refused him cuttings of a specific clone until he had properly dug his trenches three feet deep and wide and let it sit fallow over the winter. This master grower referred to the topsoil numbers. It was a best case scenerio thing and I didn't mean to suggest it was reality for most of us. I think it is somwhere in the beginning when Cox is talking about his own vineyard.
I think you missed the original posters first couple of posts because my advice was directed only at him/her. He/She is in San Diego county, as am I, and the person I refered him/her to is Lum Eisenberg who is also in San Diego county and one of the most knowledgeable people on this newsgroup and knows San DIego viticulture better than most. It is a valid referral.
However, I have opinions and a ton of horticultural knowledge and I thought I would give my advice to this fellow grower who appeared to need direction in the area of grape growing in San Diego County. I just planted my first grapes last month and he is expecting his first grapes shortly. I wanted to make sure he had accurate information before he put in the vines because he was planting upwards of 50 vines. It would be ashame to make mistakes right off the bat. Hence the referal to Cox's book and to Lum. I appologize for all the stress.