Improving Root Health, Yield & Crop Quality through Oxygen-Enriched Irrigation
1.0 Executive Summary:
Nanobubbles (NB) are ultra-fine (10–200 nm) gas bubbles in water, with exceptional stability and large surface area. Unlike macro-bubbles, they remain suspended for days or weeks, carrying high dissolved gas concentrations and even generating reactive oxygen species (ROS) under certain conditions
In strawberry production, NB-enriched irrigation can dramatically improve root-zone oxygenation, microbial activity, and soil structure. Field trials report substantial gains: for example, greenhouse strawberries under NB drip irrigation achieved 7–14% higher yield with up to 100% elimination of waterborne pathogens. In a greenhouse strawberry study using subsurface drip irrigation, micro/nanobubble water increased fruit yield by an average of 108% across aeration treatments while slightly improving vitamin C content, demonstrating the potential benefits of root-zone oxygenation under hypoxic
conditions. NB irrigation also often promotes earlier germination, more vigorous root systems, better nutrient uptake, and reduced disease (e.g. dramatic drops in Pythium and Phytophthora detections).
2.0 Mechanisms:
Nanokriti Nanobubbles are created by our patented nanobubble technology devices that infuse gas (air or oxygen) into water, generating bubbles so small they do not rise buoyantly. Their tiny radius gives a huge total surface area, greatly enhancing gas–liquid mass transfer.
As a result, NB-treated water can reach supersaturated dissolved O₂ levels that cannot be achieved by conventional aeration or diffusers. The NB’s surface charge (zeta-potential ~–20 to –60 mV) prevents coalescence, stabilizing them for long contact times. Internally, NB have high gas pressure; their collapse or oscillation under perturbation produces a mild oxidative effect. This yields a “sanitizing” effect: NB irrigation water can naturally reduce microbes and biofilm in pipes (even without added chemicals). NB can also carry other gases (e.g. ozone or CO₂) to the root zone, boosting disinfection or soil biology selectively.
Nanobubbuble Technology for strawberry farming
3.0 Soil/Root Interaction:
In the root zone, high O₂ from NB water boosts aerobic respiration. Roots supplied with NB water often show more fine (hairy) root growth, higher biomass and length. The elevated DO prolongs aerobic microbial activity in the rhizosphere (thin region of soil or water immediately surrounding a plant’s roots). Studies report NB irrigation increases beneficial soil bacteria involved in nutrient cycling, while suppressing anaerobes and pathogens.
Enhanced soil moisture retention and lower compaction have also been observed: by fracturing soil aggregates, NB water can increase porosity and decrease bulk density, improving water infiltration and root penetration. For nutrients, NB may mobilize certain ions: e.g. one study found NB irrigation raised soil available phosphorus significantly, improving P uptake by plants. Generally, NB-treated soil shows higher enzyme activities (urease, phosphatase) and nutrient availability, although effects vary with crop and soil. To date no negative interactions (e.g. toxicity) have been reported for NB water; the dominant effect is improved oxygenation and mild oxidation that favors plant health and suppresses pathogens.
4.0 Agronomic Effects on Strawberries:
Empirical evidence consistently shows NB irrigation enhances strawberry performance.
Figure: Effect of oxygen Nanobubbles in Chickpeas and green gram seed germination. Nanokriti IIT Ropar Lab results.
- Germination and establishment: NB-oxygenated water speeds germination in seeds and plugs. For example, Liu et al. found barley seeds germinated faster in oxygen NB water than plain water, implying a similar boost for strawberry transplants or seeds.
- Root growth: NB-irrigated strawberry plants develop denser, finer roots, reflecting better aeration. This leads to up to ~10–20% greater root biomass noted in tomato/strawberry studies.
- Nutrient uptake: Enhanced root systems and aerobic microbes translate to higher N, P, K uptake efficiency. A case report noted NB-grown crops required ~10–20% less nitrogen fertilizer for the same yield.
- Yield and quality: Multiple trials report yield gains. In a greenhouse trial study with subsurface NB drip, strawberry yield more than doubled (+108%) compared to control, along with a small (+3%) increase in fruit vitamin C. Grower reports 7–14% increases in marketable fruit, with heavier average berry weight. Fruit size and firmness tend to improve slightly; one study noted +5–6% fruit weight in an existing planting. NB-treated strawberries often have fewer deformed or rotted fruits, indirectly boosting marketable yield.
- Shelf life: by reducing soil and root pathogens, NB irrigation may extend shelf life slightly. For instance, dramatically lowering Phytophthora (water-borne plant pathogen) in irrigation should cut fruit rot.
5.0 Disease Suppression:
A striking benefit is biocontrol. High-DO NB water discourages anaerobic and some pathogenic fungi. In reported trials, NB irrigation eliminated detectable Phytophthora and Pythium from water and root media. Orchards using NB saw suppression of Fusarium and Phytophthora in roses. The NB’s mild oxidants (H₂O₂, ·OH) likely inactivate spores and biofilms. Additionally, NB’s physical scrubbing effect helps cleanse drip lines of biofilm. In practice, growers report far less root rot and foliar disease pressure under NB irrigation, allowing reduced fungicide use. However, NB alone won’t replace pesticides; it acts as a preventive sanitation measure. Its effectiveness also depends on gas type, oxygen NB mainly provides aerobic conditions, while controlled ozone NB would be even stronger antiseptic. Pathogens on leaves or fruit (e.g. gray mold) may still require sprays.
6.0 Risk and Regulatory Issues:
Nanobubbles themselves pose minimal safety risk, they are just water and gas. Using NB oxygen or air is no different from aerating water. Ozone NB (if used) carries the same caution. There is currently no specific regulation for nanobubble technology in agriculture. Because NB are not chemical additives.
7.0 Conclusions and Recommendations:
Current evidence, from controlled trials to real-world grower reports, indicates nanobubble irrigation can substantially boost strawberry production efficiency. The mechanisms (enhanced DO, mild oxidation, improved root/aerobic-microbe activity) are well understood. For growers, the best practices are to ensure proper NB system sizing, maintain water quality, and integrate NB into regular fertigation scheduling. Even though the technology is relatively new in field practice, its benefits (higher yield, better fruit, cleaner systems, lower chemical use) have been repeatedly observed.
8.0 References:
- Nirmalkar, N., Pacek, A. W., & Barigou, M. (2018). On the existence and stability of bulk nanobubbles. Langmuir, 34(37), 10964–10973.
- Nirmalkar, N., Pacek, A. W., & Barigou, M. (2018). Interpreting the interfacial and colloidal stability of bulk nanobubbles. Soft Matter, 14, 9643–9656.
- Chen et al. (2025), Agricultural Water Management. Micro-nano bubble drip irrigation in strawberry; found +108% yield.
- Liu & Hu (2016), ACS Sustainable Chem. Eng.. Oxygen nanobubbles generate ROS (0.3–0.5 mM H₂O₂ equiv) and enhance barley seed germination.
- Arablousabet et al. (2024), Water. Review: NBs increase soil moisture retention, microbial activity, nutrient uptake; potential to improve soil structure and yield.
- Marcelino et al. (2023), Nat. Ecol. Evol.. Review: Humic-mediated NB ROS; NB irrigation raised vegetable yields 10–40% in trials.
- Zahra et al. (2025), J. Ecological Eng.. Review of drip NB fertigation (DNFT): up to +119% yield; notable water/fertilizer savings and ROI.
- Waboost (2025), Panvita Strawberries Case Study. NB irrigation in Slovenia; +7% yield, DO tripled, pathogens removed.
- Hortidaily (2023). Dutch nursery case: +10–12% yield, +5% fruit weight; waterborne Phytophthora/Pythium cut by ~95%.
- Informal practice guidance. We thank industry sources and extension advisors for practical insights on system maintenance and dosing protocols.
- Nanokriti Internal Technical Assessment and Literature Review (2026).