The present research concentrated on the effect of through-leaves nutrition of red beet on the content of dry matter, total sugars, L-ascorbic acid and nitrates. It was carried out in the Training-Experimental Garden of the University of Warmia and Mazury in Olsztyn in the years 2001-2002. The research material comprised seven cultivars of red beet of domestic and foreign origin. The seeds were sown in mid-May and the harvest was collected on the turning of the second and third decade of September. The plants were fertilized through leaves with 0.1% and 0.2% water solution of Ekosol U. The plants were sprayed four times. The topdressing through leaves with 0.2% of Ekosol U solution had a favourable effect on the biological value of the flesh roots of the red beet expressed as the content of dry matter, total sugars and L-ascorbic acid.