Al that is one of those things that is arbitrarily set - and you need some break points. If you read the explanation of the price differences it states break points where juice above those values is set higher than anything below it.
From the report:
For comparison I assign a value of $1000 per ton for grapes of minimum brix level of 21, $900 for brix between 19.5 and 21, $800 over 18 but under 19.5 and $500 for a brix of under 18. Actual price differences will vary from area to area and variety to variety, but this shows how price drops for lower sugar and higher acids.
So that is how I came up with the price difference. Thegrapes with higher brix and lower acidsare easier for the winemaker to work with so typically are priced higher.
So is there a big diffence in the value of those two between 4AK? No, but look at the difference between 4 AK and VSP- of any treatment! It's hard to ignore this, and if it holds true in other years, on other farms and soils, it could be significant. I know I want to study it further. Anytime I can grow more grapes, of a higher quality, with less work and input, I'm all for that! It makes my job easier and more profitable.
I think the biggest thing I want to show with this study is that there can be significant differences and there needs to be more research work done to determine the most profitable way to handle these cold hardy grapes.