squiggly
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that's SO awesome - so chelates are what keeps the ion neutral and allows it to pass through the casparian strip, as opposed to the plant having to synthesize a cation/anion to bond the ion and allow it to pass through the plant...correct?
and in that regard ~ can you think of any chelates that the plant can readily use once it's been absorbed? I've been pretty convinced lately that if you can provide a stabilize rhizosphere and a standardized nutrient salt regimen, you would see very very good results with amendments of different acids and horomones in different stages to act as chelates.
and another question - do nutrient salts come to us already chelated? or are they actively being chelated either in the rhizosphere or by our plants?
Hey, I have a chemistry question! Your explanation of ionic balance struck a chord with me, so please tell me how to balance things to support our little bennies?
Citric acid and phosphoric acid are both triprotic acids which means they can lose a total of three protons to solution. This is different from an acid like HCl which fully ionizes in solution.
And without a trace of sarcasm, because I really want to know- how does triprotic action in acids help our hinder our quest for pH balance and best growing practices?
Squiggly, which basic available horticultural pH adjusters will provide the best buffering capacity to the solution? (i.e. buffering differences between acids of citrate, phosphate, sulfate, nitrate and K/Na salts of bi/carbonate, silicate, hydroxide etc.)
Am I correct in my assumption that different forms of Phosphoric acid have the same effects on pH once in solution, such as the difference between 70% aqueous phosphoric acid and PeKAcid (essentially 1 part MPK to 2 parts white phosphorus)?
I've been made to believe that the Phosphate/Carbonate combination is the best for buffering, but don't know with any certainty.
So which buffer combination in your opinion would keep pH between 5.5-6.5, that is also relatively non-phytotoxic so you could use significant amounts of the buffers combined constituents?
Am I correct in my assumption that different forms of Phosphoric acid have the same effects on pH once in solution, such as the difference between 70% aqueous phosphoric acid and PeKAcid (essentially 1 part MPK to 2 parts white phosphorus)?
thanks,
dizzle
Very much how it was put where i read it, with emphasis on carbonate.. The author (Daniel Fernandez, maker of Hydrobuddy) said that the cutoff for Carbonate was ~100 mg/l (ppm) at the pH range we're shooting for since above 100 mg/l, at the desired pH range, the levels of hydrogen carbonate are likely to reach phytotoxic levels.Probably a carbonate/phosphate buffer to be honest--recognizing that carbonate is more important and effective than the phosphate, but pH drift will be less dramatic with a bit of phosphate around.
Very much how it was put where i read it, with emphasis on carbonate.. The author (Daniel Fernandez, maker of Hydrobuddy) said that the cutoff for Carbonate was ~100 mg/l (ppm) at the pH range we're shooting for since above 100 mg/l, at the desired pH range, the levels of hydrogen carbonate are likely to reach phytotoxic levels.
http://scienceinhydroponics.com/201...oponics-what-is-the-best-cheapest-buffer.html
Well there's Amberlite ion-exchange resins and MES but that only really has value for recirculating hydroponics. Also whatever is in pH perfect unless that's MES also.
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