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Four-Cane Kniffin System
This is a variation of the umbrella Kniffin system, except that canes are selected from both the top and the middle of the trunk. It is most often used on low-vigor varieties. Although the lower canes take advantage of the lower wire because they are shaded they might have less fruit, later fruit maturation, and/or lower fruit quality than the fruit from the top-wire-trained cordons.
