Oxygen at the root, measured in the field.
Cotton on a cracking clay. Cucurbits in the semi-arid tropics. Maize under reduced phosphorus, and a pooled analysis of thirty-five studies. This is the work NanoponiX scopes against.
Cotton on a Vertosol
Bhattarai and Midmore at Central Queensland University oxygated the rhizosphere through subsurface aerated drip and raised cotton lint yield by 26 per cent against non-aerated drip. The soil was a Vertosol — a heavy cracking clay, under subsurface irrigation, which is close to the worst case for gas exchange in a root zone. That is exactly why the effect shows up there.
Watermelon and pumpkin, one soil, one season
A 2010 paper from the same group put watermelon fruit yield at 24.6 tonnes per hectare under oxygation against 14.5 on the control, with total soluble solids 19 per cent higher. Pumpkin in the same work moved from 26.3 to 28.9 tonnes per hectare.
Two cucurbits, the same clay, the same season, and roughly a sevenfold difference in the size of the response. The spread is the finding. Crop and soil decide how much of the mechanism you get, which is why the planning figure comes from a pooled estimate rather than from a single result.
The pooled effect, across thirty-five studies
A meta-analysis published in Plant and Soil pooled 2,398 data pairs from 35 peer-reviewed articles on micro-nanobubble water irrigation. Water-use efficiency rose about 11.15 per cent, crop yield about 13.55 per cent, root dry weight about 27.21 per cent and photosynthetic rate about 17.38 per cent.
Thirteen and a half per cent is a long way below seventy. It is also the number a programme is scoped against, because a pooled estimate across thirty-five studies predicts an unremarkable field better than the best result anybody ever published does.
Root dry weight rising faster than yield is worth a moment. It puts the plant's investment in the root system, which is what the proposed mechanism predicts and what a measurement artefact would not.
Phosphorus doing more work
Bian and colleagues, publishing in Plants in 2024, found micro-nanobubble drip irrigation combined with phosphorus raised maize yield by 29.21 to 41.08 per cent, and lifted agronomic phosphorus-use efficiency by up to 134.91 per cent at reduced application rates.
That last figure is the interesting one. It is not an oxygen effect standing on its own; it describes the same fertiliser doing more work. For a grower whose phosphorus cost is high, or whose nutrient export is regulated, that is the number that moves a business case — and it is the mechanism behind the only environmental claim NanoponiX makes.
Why the gas is still there at the emitter
Nanobubbles are a characterised class of object. Below roughly 1,000 nanometres, bubbles stop rising and bursting; they hold a negative surface charge, measured for oxygen nanobubbles at around −34 to −45 mV, and that charge keeps them from coalescing into large bubbles that would simply surface and vent.
Work in Science of the Total Environment reports a gas–liquid mass transfer coefficient roughly eleven times higher for nanobubble aeration than for conventional bubbles delivering the same gas volume. Comparable work in the wider literature reports enhancements several times smaller than that. The band matters when a system is sized: a design built on the top of the reported range and a design built on the middle of it are different machines with different running costs.
Open questions
Where the published work runs out.
Two of these bear on how a NanoponiX programme is scoped. One of them decides how Saline Ag Supercharge is sold.
Saline irrigation. Every oxygation result above was obtained on non-saline water. The argument that root-zone oxygen matters more where salinity is also present is mechanistic, and a mechanism is a reason to run a trial rather than a reason to raise a purchase order. Saline Ag Supercharge is scoped, priced and sold as a trial.
Radical chemistry. Whether nanobubbles themselves generate hydroxyl radicals is unresolved. Moleaer and Arizona State University reported reactive oxygen species in 2020; a controlled 2023 study by Chae and colleagues in ACS ES&T Engineering found generation minimal at best under the ambient conditions they tested. Nothing in the agronomic case here depends on which way it lands.
From a pooled average to a number about your ground
The pooled figures belong to thirty-five studies on other people's soil. One paired block, one season, with your agronomist taking the measurements, turns them into a figure about your field. Energy draw is metered in the same exercise, so the cost side of the case and the benefit side are produced together.
Anything specific to a named block arrives after that trial, in writing, with its assumptions printed alongside it. Not before, and never as a range borrowed from somebody else's soil.
The published work behind these figures
- Bhattarai & Midmore — Benefits of oxygation of subsurface drip irrigation, Crop & Pasture Science.
- Bhattarai, Dhungel & Midmore — Oxygation of cucurbits on heavy clay soil in the semi-arid tropics, Journal of Agricultural Science, 2010.
- Plant and Soil — Global meta-analysis of micro-nanobubble water irrigation, 2026.
- Bian et al. — Micro-nanobubble water drip irrigation with phosphorus on maize, Plants, 2024.
- FAO Global Soil Partnership — Global assessment of salt-affected soils.
- Science of the Total Environment — Mass transfer of nanobubble aeration and its effect on biofilm growth.
- Chae, Kim, Kim & Fortner — Reactive oxygen species generation from nanobubbles, ACS ES&T Engineering, 2023.
- Springer — Nanobubble stability and zeta potential.
- NOAA National Centres for Coastal Ocean Science — Nanobubble technology validated for remediation of harmful freshwater algal blooms, 2018.
- USGS — Sources and yields of nitrogen and phosphorus in the Mississippi/Atchafalaya basin.
Questions
Four an agronomist asks first
Is most of the oxygation literature from one research group?
A large share of the early field work is Bhattarai and Midmore at Central Queensland University, on a limited set of soils.
The 2026 Plant and Soil meta-analysis widens the base considerably, pooling 2,398 data pairs from 35 articles. Its effect sizes are also noticeably more modest, which is what a wider base tends to produce.
Why is the pooled effect so much smaller than the headline trials?
Because that is what pooling does to a literature with a wide response range. Single trials reach roughly 70 per cent. The meta-analysis puts mean yield response near 13.55 per cent and water-use efficiency near 11.15 per cent.
The pooled figure is the better planning number. It is the one used when a programme is scoped.
Source: Plant and Soil, 2026
Has NanoponiX equipment itself been trialled and published?
No. There is no peer-reviewed publication of NanoponiX hardware on a commercial farm.
Other people's work establishes the agronomic mechanism and the gas-transfer physics. A paired-block trial establishes what our equipment does on your ground.
What does this cost in energy per hectare?
It moves with flow rate, operating pressure, gas selection and how many hours a season your system runs.
Energy draw is metered during the trial alongside the agronomic measurements, so the cost side of the case is produced by the same exercise as the benefit side rather than being asserted beforehand.
The next step is a field, not a meeting
Thirteen and a half per cent, on your soil.
Send the crop, the water source, the soil type and the irrigation method. Back comes a paired-block design with the measurement points named, who takes them, and a read on whether your water is worth oxygating at all.