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The fruit on the south side of the tree can be sweeter and the bottom of the fruit is sweeter because of gravity. The south side of a tree gets more direct sun and directly heats up the fruit and leaves increasing respiration/photosynthesis creating more sugars. Total Soluble Solids is basically the minerals in the fruit. In any given fruit, the areas of higher TSS has more minerals and the juice is heavier so will settle towards the bottom of the fruit. This is very evident when you test the Brix of a Pineapple. Simon