EN
Field experiments were carried out in the years 1986-1989 at Brody Experimental Station to determine an influence of some growth regulators - Cultar, Baronet 70 WG and Alar 85 on tetraploid red clover seed yield. The results indicated and confirmed the superior influence of weather conditions on seeds yield. Cultar and Baronet applying was considerably less effective than Alar. Different positive biological mode of action of Alar was also found in this research as well as its favorable effect on yield structure parameters, germination, and seed vigor.