click80
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Do you ever get growth in the res using citric like this? I did. Some good way to prevent?food grade citric acid to pH down, usually to bring my ROd water down to 5.6-6.2.
I'm in soil and didn't use when I was in hydro. Don't know why or if citric acid would cause more or less growth in res than any other pH down. Citric acid also has some side benefits to plant health other than lowering the soil pH.
I'm not in hydro, just grew a bunch of bacteria in my res, maybe algae too (check article below). I've been saving citric for pre-harvest flushing, but would like to learn more about it's chelating properties re specific minerals (not to junk up this thread too much).I'm in soil and didn't use when I was in hydro. Don't know why or if citric acid would cause more or less growth in res than any other pH down. Citric acid also has some side benefits to plant health other than lowering the soil pH.
Runoff pH does not give an accurate picture of what's happening in the root zone. A better method is to take a core sample, dilute 1:5, soil:H2O. I built a core sampler designed especially for containers. Some of my materials will create + or - pH extremes. As a first line of attack, I try to bring the pH in range by balancing a high pH w/ a low pH nutes (or vice versa). If I have an acidic tea recipe (w/ micronutrients and kelp, for example,) I try to balance w/ a high pH tea, ie w/ something like Peruvian seabird guano that takes 6.0 water up to 7.5/8.0. If you are using a calcium source to raise pH, keep in mind that it will effect the Mg and K uptake. I rarely need to pH up w/ my regimen and use food grade citric acid to pH down, usually to bring my ROd water down to 5.6-6.2.
I'm not in hydro, just grew a bunch of bacteria in my res, maybe algae too (check article below). I've been saving citric for pre-harvest flushing, but would like to learn more about it's chelating properties re specific minerals (not to junk up this thread too much).
From JR Peters website:
Grower Question :
“We have some sort of mold or algae growing in a concentrated mixture of citric acid and water. I don’t know the exact mixture, but does citric acid tend to support organic life under certain conditions?”
Dr. Cari’s response…
The answer to your great question is YES!
Citric acid is one of algae’s favorite things to use as a food source. It not only drops the pH into a range that they enjoy it also is an organic acid…providing a buffet of Carbon (C), Hydrogen (H) and Oxygen’s (O) for the organisms to stuff themselves with. Organic acids are a perfect food source to set off a fantastic bloom either by themselves or as a hidden addition in your fertilizer formula ( you won’t find that info on the label)! Growers often use citric acid as a weak acidifier, yet they don’t realize some of the other problems that can follow if left out in the elements of a normal greenhouse.
Unfortunately there isn’t much you can do, but limit light to the tank mixture or add another element like hydrogen peroxide or Zero-tol to control these outbreaks. You may have better luck avoiding this environment if you switch to a mineral acid like sulfuric or phosphoric acid as your choice method of acidifying. Mineral acids are a much stronger acidifyier, therefore they usually require less ( and cost less) to have the same effect as a great quantity of citric acid. In addition, choosing to use sulfuric acid in the form of battery (35%) or concentrated (96%) acid will add extra nutrient concentrations of sulfate ( a great greener) which can be low in certain conditions.
does anyone know where to find alfalfa meal? thanks in advance.
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