Influence of green pruning operations shoot thinning and lateral shoots removing on the quality of grapes from table grapevine cultivars grown in the region of Kyustendil
Keywords:
vine; table grapevine cultivars; green pruning; grape qualityAbstract
During the period 2019-2020, the influence of green pruning operations - shoot thinning and lateral shoots removing on the quality parameters of grapes from the table grapevine cultivars Velika, Dunav, Ryahovo and Bolgar, grown in the region of Kyustendil, was studied. In all cultivars with variants of applied green pruning, higher values of the biometric indicators have been established – average mass per cluster, average mass per 100 grains, linear sizes of grapes and berries, compared to the controls. It has been established that shoot thinning induces proven better grain development in the Ryahovo, Velika, Dunav and Bolgar cultivars, and lateral shoots removing in the Dunav. No proven differences in the structure of grapes and grain, as well as the transportability of grapes depending on the applied green operations were found. Content of sugars and acids in the grapes, in all variants, was normal and typical for table grapes. The applied summer pruning did not affect the content of the two chemical components, and the differences between them were insignificant.
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