All are suited to manual or mechanical harvesting. The post diameter can be reduced as the vine canopy is split into two walls. The distance between posts in the same wall should not exceed 6.6 m - see Figure 1 . Click on image for larger view Figure 1. Click on image for larger view Figure 2.
Some models have mobile sides that can be folded.
Click on image for larger view Figure 3. The training wires need to be tensioned properly to stop sagging - otherwise mechanical harvesting will be impeded. The use of in-place wire strainers is recommended. This will be followed by one or two lateral trimmings and possibly a final trimming of the top. If the erect lyre is used in low-vigour vineyards, only one external trimming is needed.