Seeds of variety 'Peredovik' were presoaked in water and treated with ultrasound. A double treatment was conducted. The first one was done with an intensity of the ultrasound -2 W/cm2, 2 minutes exposure (in April 1984). After the treatment, seeds were dried at room temperature and stored in a dark and dry place. The second treatment was carried out in April 1985. The ultrasound intensity was 2 W/cm2, 4 minutes exposure. The seeds were sown in the field, one day after the second treatment. The phonological observations of M, generation were conducted from the beginning of plant germination to complete maturity. The selected plants were isolated and self-pollinated in paper bags.