Sugar beet juice was sterilized by ozonation under lab. conditions by bubbling O-3 through the tested solns. with registration of O-3 concns. on the inlet and outlet of the reactor with periodical detn. of color in the tested soln. and its surface tension. The juice fermentation with fodder yeast showed a higher reproduction of the yeast when compared to the test using a juice sterilized in a conventional manner.