How do you oxigenate your reservoir?

[Dr.Dutch]

Using air pumps and bubblers to oxygenate a reservoir for the roots/plants is completely unnecessary and bro-science when growing in coco substrate. Coco coir naturally contains a lot of air, providing ample oxygen to the roots. This practice is only relevant in water-based systems like Deep Water Culture (DWC), where maintaining dissolved oxygen levels in the water is crucial.
Water circulation in your reservoir for coco is only necessary to prevent the water from becoming anaerobic.

PS:
And please leave the H2O2 out of your nutrient solution. At that concentration, it does absolutely nothing against fungi or bacteria. Instead, it reacts with the chelates, potentially causing some micronutrients to precipitate out, and it disappears from the nutrient solution in a very short time. See also

From these choices, both hypochlorite and hydrogen peroxide have poor disinfection performance at the concentrations tolerated by plants and are hard to maintain at the desired concentrations through an entire crop cycle without ill effects

Disinfection of nutrient solutions in recirculating hydroponic systems – Science in Hydroponics

scienceinhydroponics.com

Healthy roots minimally leach nutrients into solution [101]. In our experience, increased turbidity usually indicates unhealthy roots with carbohydrate leakage. We have found that the solution in well-aerated DWC remains clear throughout the crop cycle (months) indicating low microbial activity in the bulk solution.
Several water treatment technologies have been used to reduce disease. These include chlorination, hydrogen peroxide, filtration, and ozonation [102,103,104,105]. Some sanitizers can degrade chelates in solution [106]. Ultraviolet light has been used in recirculating systems to reduce microbial activity in solution and to help prevent disease [107], but UV photons break down chelates [108], and the chelates must be re-added. Acidic root zone conditions have also been shown to reduce disease persistence [109,110].
We have not found any of the above treatments necessary. Root-zone disease has been minimal in our systems, perhaps because the root surfaces are uniformly well aerated and the steady-state nutrient levels that come from the daily refill solution result in healthier roots.

Principles of Nutrient and Water Management for Indoor Agriculture

Mass balance principles are a cornerstone of efficient fertilizer use and can be utilized to optimize plant nutrition without discarding or leaching solution. Here, we describe the maintenance of closed hydroponic and soilless substrate systems based on mass balance. Water removed by...

www.mdpi.com

 

[Dr.Dutch]

Correction and clarification on the H2O2 point – conclusion still stands: It has no place in nutrient solution.

The Impact of Adding H₂O₂ to a Plant Nutrient Solution Containing EDTA​

Adding hydrogen peroxide (H₂O₂) to a nutrient solution with EDTA affects the chemical stability, micronutrient availability, and plant growth in several ways:

1. Oxidation of the Iron Complex (Fe-EDTA):
   • Iron is often supplied as Fe-EDTA to remain soluble and plant-available.
   • H₂O₂ oxidizes Fe²⁺ in the complex to Fe³⁺:
     
     
   • Fe³⁺ is less available to plants than Fe²⁺ due to its reduced cellular uptake.
   • Further reactions may destabilize the Fe-EDTA complex, leading to iron precipitation (e.g., as Fe(OH)₃), reducing iron availability.
2. Radical Formation and Oxidative Stress:
   • The Fenton reaction between Fe²⁺ and H₂O₂ generates hydroxyl radicals (HO⋅HO^\cdot), which can:
     • Degrade EDTA, compromising its chelating ability.
     • Oxidize other micronutrients like manganese (Mn), copper (Cu), or zinc (Zn), altering their availability.
     • Oxidize organic substances, such as amino acids or humic substances, reducing their efficacy.
3. Antimicrobial Effects of H₂O₂:
   • H₂O₂ acts as a disinfectant, reducing harmful pathogens like fungi or bacteria in the nutrient solution.
   • However, this antimicrobial effect is limited at low concentrations tolerable for plants and diminishes quickly as H₂O₂ decomposes.
   • High concentrations may harm beneficial microbes, such as Rhizobium or Bacillus spp., disrupting symbiotic processes crucial for nutrient cycling.
4. pH Alterations:
   • The reaction of H₂O₂ with Fe-EDTA produces hydroxide ions (OH−OH^-), increasing the pH of the solution.
   • A higher pH can further reduce the availability of micronutrients like iron, manganese, and zinc, as they tend to precipitate under alkaline conditions.

Effects of Hydrogen Peroxide Products on Basil, Lettuce, and Algae in an Ebb and Flow Hydroponic System

Hydrogen peroxide has been used as a sanitation agent for many years. Recently, hydrogen peroxide products have been used to remove algae from irrigation lines and sanitize hydroponic systems between uses. However, hydrogen peroxide can have phytotoxic effects on plants at high concentrations...

www.mdpi.com

• Findings on Plant Growth:
  • Lettuce: Shoot fresh weight was significantly greater in control and 3% hydrogen peroxide treatments. Higher concentrations of PERpose Plus and ZeroTol restricted plant growth.
  • Basil: Only cultivar differences for SPAD and plant width were reported.
• Findings on Algae Growth:
  • Algae growth was not significantly controlled by any treatment based on algae counts, weights, or spectrometer readings.
  • However, algae species quantification showed significant reductions in Microspora tumidula concentrations with hydrogen peroxide treatments.

Effects of Hydrogen Peroxide on Organically Fertilized Hydroponic Lettuce (Lactuca sativa L.)

Hydroponic production typically uses conventional fertilizers and information is lacking on the use of organic hydroponic fertilizers. Development of biofilm is a common problem with organic hydroponics which can reduce dissolved oxygen availability to roots. One potential solution is the use of...

www.biorxiv.org

Findings:

• Plant Growth: Conventional fertilizers with H₂O₂ led to stunted growth or death of lettuce plants. However, 37.5 mg/L of H₂O₂ with organic fertilizers resulted in yields comparable to conventional fertilizers without H₂O₂.
• Dissolved Oxygen (DO): H₂O₂ increased DO levels in the root zone, but its effects diminished over time. Organic treatments showed more drastic swings in DO levels.
• Fresh Weight: The highest fresh weight was observed in the control with conventional fertilizers. Organic treatments with 37.5 mg/L H₂O₂ had similar yields to conventional treatments without H₂O₂.
• Root Length: H₂O₂ significantly decreased root length, especially in conventional treatments.
• Leaf Width and Plant Height: Higher concentrations of H₂O₂ reduced leaf width and plant height, particularly in conventional treatments.

 

[XYZVector]

Venturi and spray bars. The venturi works very well, and spray bars allow some mixing and misting.

 

[DARKSIDER]

Hydrogen peroxide (H₂O₂) is a clear and somewhat acidic liquid made up of two oxygen and two hydrogen atoms. 1 Food-grade hydrogen peroxide refers to 35% concentrated hydrogen peroxide. It's known as “food-grade” because it doesn't contain particular stabilizers that are harmful if ingested

I use food grade and also pumps running in my rezes for cleaning in a way and also mixing nutes always moving the water around whatever works best for me and my ladies but then again im not in Coco Coir

 

[Ca++]

I have used it plenty on coco. The idea coco can't be over watered is being used to suggest the h2o2 isn't needed. However, a coco grower knows this isn't so. They make efforts to aerate the coco further, such as pebbles or perlite quite often. There is always a need for more oxygen in the water, even in aeroponics.

I use coco mostly for rooting. I fill the 40 cell seed tray, wet it, and it's still wet 2 weeks later. They love a bit of h2o2 in them early feeds, when it's going to last for days.

 

[Dr.Dutch]

I have used it plenty on coco. The idea coco can't be over watered is being used to suggest the h2o2 isn't needed. However, a coco grower knows this isn't so.

No, I've been growing in coco for three years, and you can't overwater good-quality coco.

Good coco = Not too fine in structure and mixed with perlite (mixing coco with perlite is so standard that it hardly needs mentioning – at least in my case).

With that, you get a water retention capacity and air porosity in the substrate that, even when freshly watered, still allows more than enough oxygen to reach the roots.

Overwatering is simply a lack of oxygen at the roots, nothing more.

They love a bit of h2o2 in them early feeds, when it's going to last for days.

Adding H2O2 to coco results in a direct reaction with the organic matter in the coco. It doesn’t affect the plants in any other way. Sorry, but this is pure bro science regarding any benefits of h2o2 for plants, when you add it to the substrate.
Spaying it seems to have some positive effects.

Hydrogen peroxide (H₂O₂) has several documented effects when applied as a foliar spray:

1. Stress Mitigation: At low concentrations, H₂O₂ can act as a signaling molecule, helping plants manage stress from salinity or other abiotic factors. For example, in bell peppers, H₂O₂ application improved photochemical efficiency and growth under salt stress conditions, with optimal effects at lower concentrations (e.g., 15 μM)【10】【11】.
2. Antioxidant Enhancement: In amaranth plants, foliar application of H₂O₂ increased the production of phenolic compounds, anthocyanins, and antioxidant capacity. Moderate concentrations (e.g., 125–250 mM) enhanced the accumulation of beneficial metabolites without adversely affecting plant growth【10】.
3. Improved Photosynthesis: In soursop plants, H₂O₂ improved gas exchange parameters, stomatal conductance, and quantum efficiency of photosystem II, especially under saline irrigation. These effects highlight its role in maintaining photosynthetic efficiency under stress【12】.
4. Potential Risks at High Concentrations: Excessive H₂O₂ levels can cause oxidative stress and harm plant tissues. For instance, in some studies, high doses intensified stress effects rather than mitigating them【11】【12】.

Effect of Foliar Application of Hydrogen Peroxide Macroconcentrations on Growth Parameters, Phenolic Compounds and Antioxidant Capacity in the Leaves and Seeds of Amaranthus hypochondriacus L.

Amaranth has many interesting features, both nutritional and otherwise, that make it attractive as a food crop. Plants grown in greenhouses have higher yields but lower nutritional value compared to those grown in open fields. This prompted an interest in studying viable elicitors for the...

www.mdpi.com

Effect of Hydrogen Peroxide Application on Salt Stress Mitigation in Bell Pepper (Capsicum annuum L.)

The present study aimed to evaluate the effects of the foliar application of hydrogen peroxide on the attenuation of salt stress on the growth, photochemical efficiency, production and water use efficiency of ‘All Big’ bell pepper plants. The experiment was conducted under greenhouse conditions...

www.mdpi.com

Influence of Foliar Application of Hydrogen Peroxide on Gas Exchange, Photochemical Efficiency, and Growth of Soursop under Salt Stress

Hydrogen peroxide at low concentrations has been used as a salt stress attenuator because it induces a positive response in the antioxidant system of plants. This study aimed to assess the gas exchange, quantum yield, and development of soursop plants cv. Morada Nova grown with saline water...

www.mdpi.com

 

[DaEarl73]

@Ca++ recommended it to me and helped me safe my crop, 100ppm of h2o2, otherwise the plants would have had a very hard time. I still put it in early vegetation and leave it later. The plants love it! Thanks again, you helped me safe my genetics! Thanks for the info spread here too, appreciate it! Have a nice one

 

[strain_hunter]

@Ca++ recommended it to me and helped me safe my crop, 100ppm of h2o2, otherwise the plants would have had a very hard time. I still put it in early vegetation and leave it later. The plants love it! Thanks again, you helped me safe my genetics! Thanks for the info spread here too, appreciate it! Have a nice one

Should I use it in my soil grow too or is it only for coco? Have H2O2 here.

 

[Dr.Dutch]

@Ca++ recommended it to me and helped me safe my crop, 100ppm of h2o2, otherwise the plants would have had a very hard time.

Already a rate that is toxic to plants

And yeah, this is hilarious. Even at 3% H2O2, there’s no effect on algae at the roots

Hydrogen peroxide (H2O2) is a well-known oxidizing agent often used as a remedy by consumers to treat algae and root decay from presumed root disease on interior plants, as well as to encourage root growth and health. To characterize the phytotoxic effects and define the safe concentration threshold for H2O2 use on ‘Vivaldi’ hybrid phalaenopsis orchid (hybrid Phalaenopsis), root systems were dipped for 3 minutes in 0%, 3%, 6%, or 12% H2O2 one time and observed in greenhouse conditions for the following 27 days. Root systems of each plant were assessed over time for percent visible root damage; ratings of root health on a scale of 1 to 5 points, with 5 points indicating “very healthy”; and final fresh and dry weights. To determine when symptoms manifested above the root zone, foliage and flower damage was evaluated over time by assessing percent visible foliage damage, ratings of foliage health, percent foliar wilt, flower/bud count, and final foliage and flower fresh and dry weights. Over the evaluation period, the root health rating of the ‘Vivaldi’ hybrid phalaenopsis orchids treated with 12% H2O2 decreased from 5 to 1.13, whereas those treated with 3% H2O2 only decreased from 5 to 4.13. H2O2 concentrations of 6% and 12% damaged root health permanently, whereas the 3% H2O2 concentration only caused minor damage to overall root health. However, algae were not killed at the 3% rate

Characterizing the Phytotoxic Effects of Hydrogen Peroxide Root Dips on Hybrid Phalaenopsis Orchid Plants

Hydrogen peroxide (H2O2) is a well-known oxidizing agent often used as a remedy by consumers to treat algae and root decay from presumed root disease on interior plants, as well as to encourage root growth and health. To characterize the phytotoxic effects and define the safe concentration...

journals.ashs.org

Should I use it in my soil grow too or is it only for coco? Have H2O2 here.

Nope, you shouldn't use it in soil or coco. There is enough scientific evidence showing that it has no benefits and can even be harmful to plants. Just read my last few posts here.

Everything on this site, for example, is complete nonsense. It’s not the grower scene’s fault that this myth is so widespread, I would say, but holding on to it would be unreasonable.

Hydrogen Peroxide Soil Drench: Benefits and How to Use It (2024)

Hydrogen Peroxide Soil Drench: Benefits and How to Use It - The Herb Prof - Learn how this simple yet effective method can boost plant growth!

theherbprof.com

 

[DaEarl73]

Already a rate that is toxic to plants

And yeah, this is hilarious. Even at 3% H2O2, there’s no effect on algae at the roots



Nope, you shouldn't use it in soil or coco. There is enough scientific evidence showing that it has no benefits and can even be harmful to plants. Just read my last few posts here.

Everything on this site, for example, is complete nonsense. It’s not the grower scene’s fault that this myth is so widespread, I would say, but holding on to it would be unreasonable.

Hydrogen Peroxide Soil Drench: Benefits and How to Use It (2024)

Hydrogen Peroxide Soil Drench: Benefits and How to Use It - The Herb Prof - Learn how this simple yet effective method can boost plant growth!

theherbprof.com

I get your post and appreciate it. I just wrote what I saw, and thanks to ca++ I was able to save my plants! Call it broscience or whatever, but without that tip I would have lost some loved plants. Just my 2 cents, don’t want to discredit science! Thanks for the links!

 

[Dr.Dutch]

May I ask what was going on with your plants, what medium they were in, and what exactly you did?

 

[DaEarl73]

I overwatered them in rockwool, the h2o2 helped them survive and me to cut clones of them and carry on. Saved me and the roots seemed to like it

 

[spacetraveller]

What up y all!

Bubbling the reservoir with an air pump and some stones 15 min prior to each watering event, yay or nay?
I also have a stirring pump that run togheter with the air pump.....

Hey Gfr,

Aerating the reservoir is mainly for outgassing purposes, to stabilise the ph.
There is a complex acid- base interaction when we mix a brew for our plants, causing carbon dioxide to form in the mix and carbonic acid production. CO2 is highly unstable in aqueous solutions and is easily outgassed to stabilise matters somewhat.
It is also worth considering the alkalinity of your base water, as this has a major bearing on stability, rather than the use of further acids to change the ph.

Peace!