Response of Riesling clones to mechanical hedging and minimal pruning of cordon trained vines (MPCT) implications for clonal selection
DOI:
https://doi.org/10.5073/vitis.1988.27.87-93Keywords:
pruning, yield, must quality, clone, selectionAbstract
Three pruning treatments were superimposed on an established Riesling clonal selection trial situated in a hot irrigated Australian vineyard. Significant yield differences over 4 seasons between conventional spur pruning (mean 12.8 kg/vine) and the light pruning treatments, hedging and MPCT (means 14.2 and 13 .8 kg respectively), were found. Light pruning treatments produced smaller berries, but effects on soluble solids, pH and titratable acidity were small.
Yield differences between the four clones, two Australian selections SA173 and SA140 and imported clones from Europe and California, were significant in the combined analyses of the three pruning treatments. SA173 (mean 14.7 kg/vine) h ad superior production while production by SA140 (12.7 kg) was inferior. The two imported clones gave similar yields. Clonal differences were not significant with spur pruning in any season but significant differences with the light pruning treatments were evident in 3 out of 4 seasons and over the 4 years. This-suggests that traditional severe pruning used in clonal selection trials may limit the production of improved clones.
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