Ultrafine and nano-bubble water cultivation significantly increases lettuce yields.
2026-06-15
To investigate the growth-promoting effects of ultramicronanobubbles in conjunction with light exposure on hydroponically grown lettuce, this experiment established three photoperiods—10, 12, and 14 hours per day—and compared the cultivation outcomes of conventional nutrient solution with those of a nanobubble‑enriched nutrient solution.
(On the left of each figure is the conventional group, and on the right is the nanobubble group.)
After 24 days of treatment, it was found that nano‑bubble irrigation significantly increased yields across all light regimes: yield gains of 13.81%, 17.48%, and 20.84% were observed, with a clear positive correlation between longer photoperiods and greater yield enhancement. Further comparison of root morphology between the two groups revealed that the ultrafine nano‑bubble treatment produced roots that were markedly denser and longer than those in the control group, with white, vigorous rootlets exhibiting robust respiration and metabolic activity. This superior root system substantially improved the efficiency of water and nutrient uptake from the nutrient solution, thereby strongly supporting vigorous shoot growth and cumulative yield accumulation. This complete growth‑promoting cascade—from “strong roots” to “lush foliage”—demonstrates the promising potential of micro‑ and nano‑bubble oxygenation in high‑efficiency hydroponic production.
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