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Citric Acid
Citric acid is something i have used for a while to lower the pH of my tapwater to a more friendly level. it starts off about 9 and i like to bring it down to about 6. im sure you've all heard me banging on about it
![]() But the more i use it and find out about it, the more i am convinced it has many positive benefits for my plants, and the more interesting it gets as to the role that citric acid plays as a root exudate and in making nutrients - largely P - available. because citric acid tend to get talked about as a secondary subject in other threads, ive been meaning to start a thread and attempt to gather some useful posts from the four winds into one place. anyone else with experience or knowledge please contribute. here are posts by spur that has some good references Quote:
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another post
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some background reading on the krebs/citric acid cycle - im sure spurr will approve of the wiki link
![]() https://en.wikipedia.org/wiki/Citric_acid_cycle
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Hello VerdantGreen.. I've read that citric acid, I didn't know they made a powder version, when used for Phing, doesnt last very long and Ph will rise relativly quickly after application.. and, the liquid version, in DWC, can cause pump failures and clogged stones (what doesnt clog air stones??)... it is sticky..
I've never used it but these are the reasons why. I have thought about using it to lower my overall body Ph.. |
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hey scrog from what i understand, it is the alkalinity of your water supply that will determine whether the citric acid has a long or short term effect on your water pH, but as i mentioned the positive effects of citric acid are much more than just pH (and pH is not as relevant in organics anyway, my water source is high pH High alkalinity so i amend it)
not sure about pumps and airstones im afraid. carl carlson has a good thread about alkalinity and pH - ill try and get a link VG
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here is a link to carl's thread on water pH and alkalinity and how it effects soil grows.
https://www.icmag.com/ic/showthread.php?t=169662
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couple of links that i found a while back - just extracts - may have limited relevance
https://www.nature.com/nbt/journal/v1...t0400_450.html https://www.springerlink.com/content/f22x4773860r6031/ VG
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as you can see from the links, citric acid is useful for making the P in soft rock phosphate available.
i'd be interested in the dosage of SRP that others use and whether it is their primary P source. i didnt really know how much when i first got it - so started at 5g per litre of soil - which is the same as 1 tablespoon per gallon. ive stuck at this because the plants seem happy (although i also use high P bat guano too - i regard SRP as a secondary P source in my mix). question - will citric acid have the same effect on the P in my guano, making it/keeping it available? VG
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Hey VG,
I will post some info in this thread later today, I have to head out now, but I wanted to post the following study... This paper shows how plants can self-limit P uptake to try and prevent toxicity, and described how in P sufficient soils and P deficient soils (where P is applied) up to 80% of soluble P anions are made immobile (insoluble) by Fe, Al, high pH, microbes, etc. This is one reason why cannabis and other plants have developed less need for P due to lower P bio-availability in soil as plants were evolving. This paper ties into in the article from Greenhouse Grower about phosphorous I posted in one of my quotes above. This paper also talks a lot about mycorrhiza between host plant root and AM fungi; how it increases in P uptake by roots we all know about. Update on Phosphorus Uptake: Phosphorus Uptake by Plants: From Soil to Cell by Daniel P. Schachtman, Robert J. Reid, and S.M. Ayling Plant Physiol. (1998) 116: 447-453 https://www.plantphysiol.org/cgi/reprint/116/2/447 (full PDF) |
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