1 Институт по фуражните култури, Плевен; ул. ”Генерал Владимир Вазов” 89
2 Тракийски университет, Стара Загора, студенски град
Резюме
A statistical evaluation was carried out to characterize the representativeness and credibility
of the two biological (NeemAzal T/S and Pyrethrum) and one synthetic (Nurelle
D) insecticides on seed yield in alfalfa by dispersion analysis and Fischer’s parametric F
criterion. Kang’s YSi aggregate stability criterion, taking into accounts both stability and
yield value gave a negative evaluation of the untreated control characterizing it as the lowest
yield. According to this criterion, the most technologically valuable was treatment with
Nurelle D, followed by application of Pyrethrum. Those options combined high yield and
very high stability of the indicator over the years. In terms of technology to grow alfalfa for
seeds, the treatment with NeemAzal T/S received a score of 0. It combined lower yields, but
good stability over the study years.
Key words: Alfalfa, Biological and synthetic insecticides, Stability