Crop regulation techniques applied as pre-flowering defoliation (D) and early cluster thinning performed at the same time (ECT) or at lag-phase of berry growth (LCT) were tested over three seasons on high-yielding cv. Sangiovese (Vitis vinifera L.) and compared to non-defoliated, un-thinned control (C) vines of the same cultivar. Treatment severity consisted of removing primary leaves and any laterals developed from nodes 1 to 6 in D and by thinning 50% of clusters chosen among distal ones or those inserted on weak shoots, in the CT plots. Despite the fact that yield per vine was not as reduced in D (-32%) as in CT treatment (-45%) in comparison to C, early defoliated vines also had largely improved sugar and total anthocyanin concentrations and highest total phenolics. Yield components were also markedly affected by treatments: D vines showed smaller clusters and berries, leading in turn to improved cluster looseness, as well as higher relative skin and seed growth. While all crop-regulating treatments led to an increase in the final leaf-to-fruit ratio, parameters of technological maturity were essentially uncoupled as equally high Brix levels corresponded to the highest TA in D and, conversely, to lowest TA and highest pH in cluster thinning treatments. Overall results show that different final yield-grape composition patterns can be reached depending upon the principle used for crop regulation as a primary consequence of a diversified degree of compensation triggered on single yield components.

Gatti, M., Bernizzoni, F., Civardi, S., Poni, S., Effects of Cluster Thinning and Pre-Flowering Leaf Removal on Growth and Grape composition in cv. Sangiovese, <<AMERICAN JOURNAL OF ENOLOGY AND VITICULTURE>>, N/A; (N/A): N/A-N/A. [doi:10.5344/ajev.2012.11118] [http://hdl.handle.net/10807/19185]

Effects of Cluster Thinning and Pre-Flowering Leaf Removal on Growth and Grape composition in cv. Sangiovese

Gatti, Matteo;Civardi, Silvia;Poni, Stefano
2012

Abstract

Crop regulation techniques applied as pre-flowering defoliation (D) and early cluster thinning performed at the same time (ECT) or at lag-phase of berry growth (LCT) were tested over three seasons on high-yielding cv. Sangiovese (Vitis vinifera L.) and compared to non-defoliated, un-thinned control (C) vines of the same cultivar. Treatment severity consisted of removing primary leaves and any laterals developed from nodes 1 to 6 in D and by thinning 50% of clusters chosen among distal ones or those inserted on weak shoots, in the CT plots. Despite the fact that yield per vine was not as reduced in D (-32%) as in CT treatment (-45%) in comparison to C, early defoliated vines also had largely improved sugar and total anthocyanin concentrations and highest total phenolics. Yield components were also markedly affected by treatments: D vines showed smaller clusters and berries, leading in turn to improved cluster looseness, as well as higher relative skin and seed growth. While all crop-regulating treatments led to an increase in the final leaf-to-fruit ratio, parameters of technological maturity were essentially uncoupled as equally high Brix levels corresponded to the highest TA in D and, conversely, to lowest TA and highest pH in cluster thinning treatments. Overall results show that different final yield-grape composition patterns can be reached depending upon the principle used for crop regulation as a primary consequence of a diversified degree of compensation triggered on single yield components.
2012
Inglese
Gatti, M., Bernizzoni, F., Civardi, S., Poni, S., Effects of Cluster Thinning and Pre-Flowering Leaf Removal on Growth and Grape composition in cv. Sangiovese, <<AMERICAN JOURNAL OF ENOLOGY AND VITICULTURE>>, N/A; (N/A): N/A-N/A. [doi:10.5344/ajev.2012.11118] [http://hdl.handle.net/10807/19185]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10807/19185
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