Special form of reber drawing; see at Lyre.
This Training Form (also U or V training) was developed in the early 1980s by Dr. Alain Carbonneau Alain at INRA in Bordeaux. It consists of a support structure that opens upwards in a V or U shape, resembling the namesake Greek musical instrument. The vine shoots are about 80 cm high, and the row spacing is at least three meters. The Shoots are divided so that two leaf walls with a hollow area in the middle are created (as opposed to Trellis Training with only one leaf wall).
This results in a doubling of the leaf surface area and thus better utilization of solar energy with improved...
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