Trials on limiting yields of Merlot grapes in Ticino. Effects on the quality of the grapes and wines | Essais de limitation de rendement sur Merlot au Tessin. Effets sur la qualite des raisins et des vins
2004
Murisier, F. | Ferretti, M. | Zufferey, V.,Agroscope RAC Changins, Station federale de recherches agronomiques, Pully (Switzerland). Centre viticole du Caudoz
From 1997 to 2002, trials on yield control by suppressing bunches of grapes after the "pea-size" stage were carried out on Merlot grapes on the Gudo experimental estate of Federal agricultural research station Agroscope RAC Changins in Ticino. Two different yield levels were compared: one with little or no restrictionsand the other heavily restricted. Agronomic, analytical and organoleptic parameters were monitored. Comparisons of vinification were made throughout the trials. Relatively little improvement in must sugar content due to yield control was noted in the Merlot variety of grape (0.3 °Oe per 100 g/m2 on average). It was more noticeable when the initial yield was greater (from the vines with little or no yield control). Must acidity tended to decrease with lower yields. Analytical differences between wines were small. Wines produced from grapevines where yields were heavily restricted were generally preferred to those made from crops with little or no yield control.
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