Cultivars ’Hasanski Sladki’ and ’Zilga’ have been reasearched in Estonia for a long time as well grown in home gardens. Tha problem in the Nordic countries with the open field grapevine growing is the insufficient maturation of the berries, as an alternative is growing grapevines in greenhouse. Hypothesis according to this data: greenhouse grapes are mature before open field ones but may not have equal quality. The main aim of the experiment was to find out the effect of growing site, open field or greenhouse conditions, on the grapevine yield quality. The experiment was carried out in two vineyards: Rõhu Experimental Centre of the Estonian University of Life Sciences in open field conditions and at Saare-Tõrvaaugu gardening farm in Pärnu County in greenhouse conditions. Cultivars in the experiment were ʼHasanski Sladkiʼ and ʼZilgaʼ, both on open field and in greenhouse. Greenhouse grapes obtained sufficient maturity earlier than open field grapes and had better yield quality when compared to open field ones. In addition to properties of the grape cultivar, the growing environment had also a significant influence on grape maturation and yield quality, especially temperature and light conditions. Results obtained in this thesis are only applicable in the cases of the used cultivars – ʼHasanski Sladkiʼ and ʼZilgaʼ in concrete growing sites. While starting with grapevine growing and selecting a cultivar, an aspect that different cultivars react differently to different environmental conditions, should be considered. Although the grapevines in the experiment are recommended to be grown in open field and the grapes to be used in vine production, they also may be recommended to be grown in greenhouse conditions. In these conditions, the content of organic acids can be decreased to optimal level, the sugar content increased and grapes achive sufficient maturity earlier.

Sorte ʼHasanski Sladkiʼ ja ʼZilgaʼ on Eestis juba pikemat aega katsetatud, samuti on mõlemad sordid levinud Eesti koduaedades. Põhjamaades on avamaa viinamarjakasvatuses probleemiks marjade ebapiisav küpsemine, sellest lähtuvalt on alternatiiviks viinapuude kasvatamine kasvuhoones. Lähtuvalt eelnevast püstitati hüpotees: katmikalal valmivad viinamarjad küll varem kui avamaal, kuid ei pruugi olla samaväärse kvaliteediga. Töö eesmärgiks oli selgitada välja kasvukoha ehk avamaa- ja katmikala tingimuste mõju viinapuude saagi kvaliteedile. Katse viidi läbi kahes viinamarjaistanduses 2013. aasta suvel: Tartumaal Rõhu katseaias avamaa tingimustes ning Pärnumaal Saare-Tõrvaaugu aiandi katmikalal. Katsevariantideks olid ʼHasanski Sladkiʼ avamaal, ʼHasanski Sladkiʼ katmikalal, ʼZilgaʼ avamaal ja ʼZilgaʼ katmikalal. Katmikalal valmisid viinamarjad varem kui avamaal, näidates ka paremat saagi kvaliteeti võrreldes avamaal kasvanud viinamarjadega. Lisaks sordiomadustele mõjutas viinamarjade küpsemist ja saagi kvaliteeti oluliselt ka kasvukeskkond, eelkõige temperatuuri- ja valgustingimused. Saadud tulemused kehtivad sortidele ’Hasanski Sladki’ ja ’Zilga’ vaid konkreetsetes kasvukohtades. Viinamarjakasvatusega alustades ja kasvukohale vastavat sorti valides tuleks arvestada, et erinevad sordid reageerivad keskkonnatingimustele erinevalt. See tähendab, et kuigi katses olnud sordid on soovitatud avamaal kasvatamiseks ja mõeldud veiniviinamarjade tootmiseks, võib neid soovitada ka kasvuhoones kasvatamiseks. Katmikala tingimustes on võimalik alandada orgaaniliste hapete sisaldust soovitatud taseme piiresse, suurendada suhkrutesisaldust ning viinamarjad saavutavad ka oma täisküpsuse varem.