The influence of pruning date on yield control and ripening rate of spur-pruned Sangiovese grapevines was investigated over two years (2013 and 2014). Winter pruning was applied on 1 or 4 Feb (mid dormancy); 1 or 5 March (late dormancy); 2 or 7 April (bud swell); 2 or 7 May (flowers closely pressed together); and 1 or 6 June (40 to 50% of flower caps fallen), respectively. Vine yield and fruit composition at harvest were not affected by shifting from the standard pruning dates of mid and late dormancy to the bud swell stage. In contrast, the number of inflorescences in compound buds was significantly reduced for vines pruned in early May. No inflorescences were retained on vines pruned at the beginning of June. Early May pruning reduced fruit set and berry weight and slowed fruit ripening compared to the other pruning dates. At harvest, must soluble solids and titratable acidity were 1.6 Brix lower and 1.8 g/L higher, respectively, for the May treatment compared to the standard pruning dates. The early May pruning dates also achieved higher total anthocyanins and phenolic concentrations than the standard pruning dates, indicating that this technique can potentially decouple the accumulation dynamics of these components. Further studies are needed to better calibrate winter pruning date for managing yield and berry maturation rate.

中文翻译：

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在意大利中部的桑娇维塞，芽后修剪可降低产量并延迟果糖积累

两年（2013 年和 2014 年）研究了修剪日期对直修剪的桑娇维塞葡萄藤的产量控制和成熟率的影响。2 月 1 日或 4 日（休眠中期）进行冬季修剪；3 月 1 日或 5 日（晚休眠）；4 月 2 日或 7 日（芽肿）；5 月 2 日或 7 日（花朵紧贴在一起）；和 6 月 1 日或 6 日（40% 到 50% 的花冠掉落），分别。收获时的葡萄产量和果实组成不受从休眠中晚期到芽膨胀期的标准修剪日期的影响。相比之下，5月初修剪的葡萄藤的复芽花序数量显着减少。在 6 月初修剪的葡萄藤上没有保留花序。与其他修剪日期相比，5 月初的修剪减少了坐果和浆果重量，并减缓了果实成熟。收获时，与标准修剪日期相比，5 月处理的果浆可溶性固体和可滴定酸度分别降低了 1.6 白利糖度和 1.8 克/升。与标准修剪日期相比，5 月初的修剪日期也获得了更高的总花青素和酚类浓度，这表明该技术可以潜在地解耦这些成分的积累动态。需要进一步研究以更好地校准冬季修剪日期以管理产量和浆果成熟率。表明该技术可以潜在地解耦这些组件的累积动态。需要进一步研究以更好地校准冬季修剪日期以管理产量和浆果成熟率。表明该技术可以潜在地解耦这些组件的累积动态。需要进一步研究以更好地校准冬季修剪日期以管理产量和浆果成熟率。