The experiment was conducted on brown forest soil in the vineyard with Sauvignon blanc variety on Kober 5BB rootstock. During a thre- year experiment (1994-1996), potassium fertilizer was added in a dose of 0 kg K₂O/ha, 50 kg K₂O/ha, 100 kg K₂O/ha, 150 K₂O/ha respectively.

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.