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In this blog we explore a technology that sounds like science fiction but is quickly becoming a real-world tool for growers; plasma-activated water (PAW). This emerging innovation could reshape how hydroponic systems deliver nitrogen, fight pathogens, and maintain cleaner reservoirs, potentially without the environmental footprint of traditional fertilizers.
Let’s break down what it is, how it works, and why it matters.
Before diving into hydroponics, it’s worth understanding the inspiration behind plasma-activated water; lightning.
When lightning strikes, the huge electrical energy breaks apart nitrogen molecules (Nâ‚‚) in the atmosphere. This allows nitrogen to combine with oxygen to form nitrogen oxides (NO and NOâ‚‚). These compounds dissolve in rain and fall to Earth as plant-available nitrates.
Incredibly, 5–8% of all soil nitrogen comes from this natural process.
Plasma-activated water is designed to mimic this effect, without storms or soil.
Plasma is the fourth state of matter; an ionized gas. Lightning is plasma. So are neon lights and the sun’s corona.
Scientists create plasma in a controlled environment and pass it through water. This process infuses the water with reactive oxygen nitrogen species (RONS).
These compounds serve two powerful functions:
RONS add small but useful amounts of nitrogen to the water—similar to the natural fertilization caused by lightning.
RONS also kill microbes, suppressing:
The key is concentration: too little is ineffective, too much can burn plant roots. This is where ongoing research is focused.
There are currently two major delivery systems:
Effective but riskier due to high energy exposure.
Water flows through a reactor, like a small generator, before entering the system.
This method is already being tested in commercial and research greenhouses.
Studies in Taiwan, Europe, and vertical farms show promising results.
Leafy greens like lettuce and bok choy respond particularly well.
Some studies show similar yields to standard nutrients with reduced synthetic nitrogen.
PAW can disinfect root zones, suppress pathogens, and reduce algae—with zero toxic residue. Unlike chlorine or peroxide, reactive species naturally decay.
Systems using PAW show lower EC drift, meaning fewer corrections and more predictable nutrient balance.
PAW isn’t perfect, yet.
Effectiveness depends on storage time.
Too strong = root damage
Too weak = no benefit
Commercial generators aren’t widely available.
PAW mainly adds nitrogen.
Growers still need a complete fertilizer containing:
Brands like Liquid Gold could be used alongside PAW for complete nutrition.
Early adopters are likely to be:
There’s even growing curiosity about whether PAW could be certified for organic hydroponics—a category recognized in the US but not yet in the UK/EU. Researchers are currently seeking regulatory guidance on this.
PAW isn’t hype—it’s real technology, but still early-stage.
If costs come down and dosing becomes more reliable, plasma-activated water could become a:
For now, it’s a promising supplement—not a full nutrient solution—but one that could play a major role in sustainable hydroponics.
Article by Dr Russell Sharp
If you would like to keep up to date with subjects just like this, you can listen to both our podcasts! Links can be found bellow:
Hydroponics Daily Podcast: https://podcasts.apple.com/us/podcast/hydroponics-daily/id1788172771
Cereal Killers Podcast: https://podcasts.apple.com/us/podcast/cereal-killers/id1695783663