Affiliation:
1. Department of Plant Production, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria
Abstract
Abstract. A study was conducted to investigate the effect of bunch normalization and defoliation on winter eye fertility, quantity and yield quality in Cabernet Franc. It was found that the application of green pruning resulted in an increase in mass per bunch and per 100 grains, but a decrease in yield per vine. The sugar content increased slightly in the green pruned variants. In the two-year period of the study, high temperatures and low rainfall during the growing season reduced the effect of bunch rationing and defoliation on grape yield and quality. There was no significant difference in grape quality between the treatments under high temperatures. After the hot and dry year of 2021, lower values of the actual fertility indicators - percentage of fruiting shoots and fertility coefficient - were observed in 2022.
Reference36 articles.
1. Alessandrini M, Battista F, Panighel A, Flamini R and Tomasi D, 2018. Effect of pre-bloom leaf removal on grape aroma composition and wine sensory profile of Semillion cultivar. Journal of the Science of Food and Agriculture, 98, 1674-1684.
2. Bulgarian ampelography, 1990. General ampelography, Publishing of BAS (Bulgarian Academy of Sciences) AA. Institute of Viticulture and Enology Pleven, I, 296 p., Sofia, Bulgaria (Bg).
3. Cardell MF, Amengual A and Romero R, 2019. Future effects of climate change on the suitability of wine grape production across Europe. Regional Environmental Change, 19, 2299-2310.
4. Dry PR, 2000. Canopy management for fruitfulness. Australian Journal of Grape and Wine Research, 6, 109-115.
5. Fraga H, Malheiro AC, Moutinho-Pereira J and Santos JA, 2012. An overview of climate change impacts on European viticulture. Food and Energy Security, 1, 94-110. doi: 10.1002/fes3.14 – DOI