A training system (double-curtain training) developed in the early 1960s by the US viticulturalist Dr. Nelson Shaulis (1913-2000) at Cornell University (Geneva, New York State). It belongs to the large group of so-called cordon education systems. Originally, it was created specifically for the Concord grape variety to enable mechanical harvesting. The vines are pulled onto a high T-shaped framework (also V-shaped). The vine row spacing is about three metres. The young shoots are divided to the left and right and the foliage is directed onto two wire frames that can be folded down.
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