The experiment was carried out in 2005 and 2006 in the vineyards of the village of Brestovitza in the region of Plovdiv. Five variants were investigated — 1) Control — untreated, twice mechanically hoed in the row and between the rows. 2) Kosmik (8000 ml/ha), 3)Kosmik (12000 ml/ha), 4) Roundup (8000 ml/ha), 5) Roundup (12000 ml/ha). The aim of the present investigation is to study the efficiency of the herbicide Kosmik on the special type of weeds and the degree of weed spread, the influence of the production and on some indices — which characterize the grape quality (sugar content, titrabe and generally acidity, residues).
The results showed that both variants (8000 ml/ha and 12000 ml/ha) had had a perfect effect against all types of annual weeds. The dose of (8000 mlfha) was efficient only against Cynodon dactylon (L) Pers, Andropogon halepensis — Brot. The dose of (12000 ml/ha) was efficient against all the species — annual and perenial.
Higher yields have been obtained from the variant, treated with Kosmik (12000 ml/ha — 9950-9100-9520 kg/ha; 22—23—22%). The herbicide does not influence negatively over the quality of grape of c.v. Bolgar.