ken dog
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And that is why I was thinking dual purpose! Very nice way to kill two birds with one stone if it can be managed.
This pretty well sums it up. " By measuring these two simple factors, most nutritional problems can be avoided. The measurement of Dissolved Oxygen (DO) is also proving to be just as critical to plant growth. As with the other two measurements, there are minimum levels required for a healthy plant. Also, by optimizing DO, as with pH and EC, we can see great improvements in plant growth and quality. However, far fewer growers are utilizing, or are even aware, of this measurement.
This pretty well sums it up. " By measuring these two simple factors, most nutritional problems can be avoided. The measurement of Dissolved Oxygen (DO) is also proving to be just as critical to plant growth. As with the other two measurements, there are minimum levels required for a healthy plant. Also, by optimizing DO, as with pH and EC, we can see great improvements in plant growth and quality. However, far fewer growers are utilizing, or are even aware, of this measurement.
300% DO Supersaturation... wonder what kind of device they used to test the DO sat with? And, the hyperbaric pressure that was maintained, how much continuous pressure on plant, the roots and nutrient solution to achieve this ? Maybe 2-3 ATM, 29.4 psi -44.1 psi?
These researchers have no doubts about the vital importance of oxygenation and technically and how to achieve their oxygenation goal. Thanks for bring this piece to the forums attention.
You brought this info to the forum Ken, I read the piece:This is all very interesting stuff... Thank you also, for helping bring this topic to the front.
Regarding 300% saturation, I imagine you could use Henry's law to figure out the pressure needed to attain those levels... I'm guessing that's how you derived your estimates.
Fun topic.
Pinning down the correct ORP value is going to be tricky... simply put, there is no information out there regarding proper ORP values for growing crops, and very few people are doing it... And whoever is doing it, they are keeping their ORP values a secret.Thanks for all the info guys. My notes files are getting stuffed. Real excited to see how the ozone injection stuff works out. I'd already be running this sort of setup except that I had read about someone (company/researchers) who tried it, and found that ozone at a useful concentration would destroy the chelates.
You might be surprised at what he says when you talk to him. He's the Executive VP of Sales and Marketing, test him, see if he can sell you on the concept of DO Supersaturation. I bet his presentation about preventing "low oxygen" will be very, very different than a water chiller salesman or an aerator salesman.Thanks, I appreciate it... he sounds like a good authority.
You might be surprised at what he says when you talk to him. He's the Executive VP of Sales and Marketing, test him, see if he can sell you on the concept of DO Supersaturation. I bet his presentation about preventing "low oxygen" will be very, very different than a water chiller salesman or an aerator salesman.
Heya Ken, I did a bit of snooping here. I'll go ahead and reply about it in your Ozone thread, rather than to derail......whatever this is.Pinning down the correct ORP value is going to be tricky... simply put, there is no information out there regarding proper ORP values for growing crops, and very few people are doing it... And whoever is doing it, they are keeping their ORP values a secret.
I'm trying to keep mine at least 260mV and right around 300 mV.
I've gone as high as 340mV.
And keeping in mind, that ORP meters are not an exact measurement... It is constantly changing, and 15mV plus or minus is a good reading.
ORP values below 260mV, and you may as well not use any sort of disinfectant... Is my understanding.
Nope. Not in the slightest.As the system remains under pressure, the DO levels can be maintained at more than 300% of the saturation level of DO.
Oxygenation is no doubt a very slippery slope in the world of RDWC and DWC pot growing. A world pocked with assumption, conjecture and he says Joey said. Many growers and others claim that “low oxygen” in root zones and nutrient water presents opportunity for Pythium and other fungal organisms to thrive and listening to all the growers fighting this disease, there appears many preventive measures often fail.This whole area of concern around DO is getting pretty nuts. You can easily find out all the info from published documents. Guess I've been wanting to leave this alone; but maybe it all needs straightened out.
In 68F water 5 ppm DO concentration = 54% DO saturation is optimalTo tl;dr that post. Science says 68-71F is optimal temp and that greater than 4mg/l of Oxygen has no effect on pythium. Optimal "high oxygen" is considered to be 5-7 mg/l.
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