If the growth was excessive then more nodes are retained. In practice, most growers will have a target number of canes to leave on their typical vine and then adjust the number based upon apparent growth. Hedge pruning - uses straight cutter bars to remove some of last year's cane growth. Crop is roughly controlled, but there is little opportunity to adjust for individual vine needs. Minimal pruning - only growth that is too low or intruding into adjacent vine spaces is removed.
Crop is established by components of yield compensation and by berry thinning.
The figure demonstrates the growth rate of different vine organs at different times during the growing season. The growth rate reflects the amount of vine reserves or photosynthates which are being used for growth. You can see that there is competition among organs for vine carbohydrates. After bloom when berry growth starts, it dominates. After harvest carbohydrates are again available for root and shoot growth.