| 摘要 |
PROBLEM TO BE SOLVED: To provide a tea leaf comprising large amounts of umami ingredient irrespective of the season and place and without the influence of weather.SOLUTION: In at least a light volume suppression period (S6) after an embryo period (S4) for growth of a sprout of a tea tree (23), the tea tree (23) grown in the embryo period (S4) is irradiated with far-red light, as well as visible light in a wavelength range required for photosynthesis. |
