Yield and grape must quality of the IAC 138-22 ‘Máximo’ submitted to canopy management

ABSTRACT Grape cultivar IAC 138-22 'Máximo' grafted on IAC 766 ‘Campinas’ and IAC 572 ‘Jales’ rootstocks and trained in upright trellis was evaluated during consecutive summer and winter growing seasons for comparison different canopy management: a) branch thinning: comparison between one branch and two branches per spur and b) branch tipping: comparison between low and high upright trellis. The results obtained of the phytotechnical and physicochemical grape must characteristics allowed to confirm that there was no significant difference between rootstocks regarding branch thinning intensity and upright trellis height. The largest effect observed in canopy management was for yield values promoted by branch thinning. No effect was observed in the grape must physicochemical characteristics when the different treatments were compared in the same growing season. Regarding to the upright trellis height, larger values of soluble solids were obtained for the high trellis than in the low trellis. Winter growing season resulted in lower values of yield and greater values of total soluble solids and titratable acidity than in the summer growing season.

摘要：本试验以嫁接于IAC 766‘坎皮纳斯（Campinas）’与IAC 572‘雅莱斯（Jales）’砧木（rootstocks）的葡萄品种IAC 138-22 'Máximo'为试材，采用直立棚架（upright trellis）栽培模式，在连续夏、冬两季生长季开展评估，对比两类树冠管理（canopy management）措施：a) 疏枝处理：对比每个短果枝（spur）留1枝与留2枝的差异；b) 枝梢摘心处理：对比矮直立棚架与高直立棚架的差异。通过测定栽培学特性与葡萄醪（grape must）的物理化学指标，结果证实：砧木类型对疏枝强度及直立棚架高度无显著影响；树冠管理措施中对产量提升效果最显著的为疏枝处理；同一生长季内，不同处理对葡萄醪物理化学特性无显著影响；就直立棚架高度而言，高棚架的可溶性固形物含量显著高于矮棚架；冬季生长季的产量低于夏季生长季，但可溶性固形物总量与可滴定酸度均高于夏季生长季。