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：本研究以嫁接于IAC 766‘坎皮纳斯（Campinas）’、IAC 572‘雅莱斯（Jales）’砧木，且采用直立棚架（upright trellis）栽培的葡萄品种IAC 138-22‘马克西莫（Máximo）’为试材，在连续夏、冬两季生长季中开展评估，以对比两类冠层管理措施：a）枝梢疏除：比较每结果枝组留1枝与留2枝的处理差异；b）枝梢摘心：比较高直立棚架与低直立棚架的处理差异。通过对葡萄栽培学性状与葡萄汁（grape must）理化特性的测定结果可证实，砧木类型对枝梢疏除强度及直立棚架高度均无显著影响。冠层管理措施中，对产量提升效果最显著的为枝梢疏除处理。同一生长季内，不同处理对葡萄汁理化特性均无显著影响。就直立棚架高度而言，高棚架处理的可溶性固形物含量显著高于低棚架处理。冬季生长季的产量低于夏季生长季，但其总可溶性固形物与可滴定酸（titratable acidity）含量均高于夏季生长季。