The content of vitamin B1 in wheat and rye grain remained at a constant level and that of vitamin B2 gradually increased during germination over 5 days at 20°C (in the dark). Significant difference was observed for rye within 1 day and for wheat in 2 days. By day 5, the content of vitamin B2 in both crops increased by 2.7-2.9 times above the baseline value.