use more water to cool down its tissues, mainly after temperatures decrease in the evening. The higher the index, the lower will be berry quality and aptitude to produce quality grapes. The loss of acidity will, even for lower index levels, mean higher costs from acidity correction and water needs. There are inter- and intra-varietal variations in grapevines towards this threshold.
The extent to which the future state of a system may be predicted based on knowledge of its current and past states. Predictability is inherently limited, since knowledge of the system’s past and current states is insufficient, and the models that utilize this knowledge to produce a prediction are generally imperfect. Even with arbitrarily accurate models and observations, there may still be limits to the predictability of a physical system.