So, research glycolysis and the citric acid cycle if you haven't already. This is a basic place to begin to understand the role of sugars and pyruvate in cell function. Your plants are using sugar among other things to rejuvenate their existence (reductive but kinda true). The Brix scale and meter are a way of measuring your total sucrose:solids. If your plants are alive- you have little need for this as ....well, they wouldn't be, if your sucrose or glucose was fucked up. (Once again, reductive but kinda true.)
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