The effects of shoots and leaf removal on some qualitative prameters of cultivar muškat žuti (Vitis vinifera L.) at Varaždin vineyard district

Pokus za istraživanje utjecaja defolijacije i uklanjanja zaperaka na pokazatelje kvalitete mošta (sadržaj šećera, ukupnu kiselost i pH vrijednost) kultivara Muškat žuti je postavljen po slučajnom bloknom rasporedu u vinogradu obitelji Žmegač u Varaždinskom vinogorju 2019. godine. Istraživanje je provedeno na ukupno 72 trsa. Jednu repeticiju činilo je šest trsova, pa smo imali po četiri repeticije za defolijaciju, zalamanje zaperaka i kontrolu. Nakon provedene laboratorijske analize uzoraka napravljena je analiza varijance prema slučanjom bloknom rasporedu. Značajne i visoko značajne razlike između tretmana utvrđene su za sadržaj šećera, ukupnu kiselost i pH vrijednost mošta. Kod kontrole utvrđen je značajno veći sadržaj šećera u odnosu na defolijaciju i zalamanje zaperaka. Visoko značajne razlike za ukupnu kiselost mošta utvrđene su za tretman zalamanja zaperaka odnosu na defolijaciju i kontrolu.Visoko značajna razlika za pH vrijednost mošta utvrđena je za kontrolu u odnosu na tretman defolijacije i zalamanje zaperaka.Experiment for investigation of defoliation and sprout removal on some must quality parameters (sugar, total acidity, pH value) cultivar Muscat Yellow was set up randomized block design in the Žmegač family vineyard in Varaždin vineyards in 2019. Investigation was conducted on 72 vines in total. One rehearsal consisted of six vines, so we had four rehearsals each for defoliation, sprout removal and control. After the laboratory analysis of the samples, the analysis of variance according to randomized block design. Significant and highly significant differences between the treatments undertaken were obtained for the sugar content, the total acidity and the pH value. During the control, a significantly higher sugar content was found in relation to defoliation and shoots removal. Highly significant differences for the total acidity of the must were found for the treatment of shoots removal in relation to defoliation and control. A highly significant difference for the pH value of must was found for control in relation to the treatment of defoliation and shoots removal