I agee with most of what was said in the previous posts. This is what I did and should have done.
All rows are 10’ wide. 11’ would have been better. Make sure you have enough head room at the end of the rows to turn your tractor with a sprayer on the back. 18’ between posts with 6’ spacing between vines. 8’ would be better but I am limited on space. Older tractors don’t have live PTO. I have a 1980 JD 850 rear wheel drive w/o live pto. Make sure you get live pro. It will help with the types of sprayers you use. Mowing without it is a pain. Air blast sprayers would be great but expensive. Thinking about making something this winter using sprayers, flex hoses and a high power leaf blower. If you have high vigor, a hedger attachment will be needed once you get over 3 acres. I have a gas powered trimmer on an extended pole that hangs off a backpack balancer to hedge. I have to hedge at least 3 times a season. Vineyard down the road just bought a side hedger and it changed his life he said. He took me for a ride and I can see what he means. They are not cheap but time is money in this case. You can hedge several acres in a day and that beats doing it manually every day for a week or so. I used to spray glyphosate under each row that left 3’ on each side. I’ve narrowed that down to about 1.5’ on each side now. As stated above, it helps with vine vigor. Made a detachable, spring loaded boom for the front of my zero turn and pull a 25 gal sprayer for roundup.