The effect of foliar application of plant growth regulators, paclobutrazol (1000 mg/L), chlorcholine chloride (200 mg/L) and gibberellic acid (100 mg/L) on leaf water status in grapevine graftlings of cv Cardinal was investigated. After stratification and waxing, young vines were planted into vegetation pots and grown in a glasshouse. Foliar treatments were applied once, twice or three times during the vegetative period, starting on 25 July and every 15 days thereafter.

Comparative studies on new wine-grape varieties and clones developed at Sremski Karlovci, on the Experimental estate of Agricultural Faculty, Novi Sad, were conducted in the 1997-1999 period. The studies comprised varieties Neoplanta (Smederevka x Traminer), Petra (Kunbarat x Pinot noir), Early Riesling (Riesling italico x Kunbarat) and clones of the variety Riesling italico: SK13, SK54, SK61.

In the period 1997-1999 comparative researches of the white wine varieties were conducted, viz. Smederevka, Italian Riezling, Riezling weisser (clone 239 Gm), Sauvignon white, Pinot blanc and Chardonnay (clone R8). In the first three years of the growing fertility of these varieties, their main biological characteristics and grape quality could be determined.