Anthony,
Brix should be the same for the entire plant if it is
functioning properly, I have found the easiest for grape vines is to take the
petioles of the newest mature leaves, the leaves a difficult to get juice
from.
Test regularly ie at the same time of the day. Test Brix
before CT application and then 45 mins after. Leave a control area if possible.
there needs to be 2 hours sunshine min prior to application. Also a few
days of low sunshine will lower Brix in most vineyards, so make sure it has been
plenty of sun the few days prior to testing. It would be really useful if you
were able to record the brix and post the info.
Regards Mike Harvey.
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