Abstract
The most labour saving height and span of the supporting wires in the Lenz Moser training system for grapevines was studied.
The varieties used were, ‘Kyoho’, ‘Muscat Bailey A’, and ‘Super Hamburg’.
The wider the span of the supporting wires, higher were the percentage of shoots supported by the wires.
However, taking account of passage between the rows, the optimum wire span was 20cm.
When the wire spans of the 2nd and 3rd level were set to 20cm, the height with the maximum supporting rates for the 2nd and 3rd wires were, 30 to 34cm and 45 to 49cm above the principal wire for ‘Super Hamburg’, 20cm or 30cm and 64cm for ‘Kyoho’, and 30 to 34cm or 40 to 44cm and 50 to 54cm or 65 to 69cm for ‘Muscat Bailey A’, respectively.
The relation between the height of wires (Y) and the height of the node bearing the tensil coiled to wires(x) were,
Y=0.79x+7.84, r=0.82
for ‘Muscat Bailey A’, and
Y=0.70x+6.91, r=0.74
for ‘Super Hamburg’
From these linear regression lines, it may be possible to make a Lenz Maser training system which can save 70 to 80% of the training labour.
