I do a lot of hobby hydroponic growing. I have noticed acidity building up
in some of my pots. I attribute it to the preferential consuming of
potassium that leaves the nutrient solution more acid.
Today, I bought some marble chips. I placed a handful in several of my
nutrient containers. My expectation is that as the solution becomes more
acid, the marble will decompose giving of carbon dioxide and thereby
consuming some of the acid. I will report on whether this keeps the pH above
Has anyone had experience with this kind of pH control?
Soil. My blueberries died here and the blackberries werent sweet and had no
flavor. Blueberries require a pH of around 4.5 and we have 6.9 here. I was
told that the only thing that will grow in a pH above about 8.8 is weeds.
On 9/12/05 8:38 PM, in article 82044$432649bf$cee617f9$ firstname.lastname@example.org,
I am using the calcium carbonate (marble) for hydroponic pH control.
For your problem, you might want to consider using Gypsite. It is
combination of gypsum and sulfur. You can also try sulfur by itself. Also,
you can use ammonium sulfate or nitrate. That should acidify the soil
quickly. They are combinations of a weak base and strong acid.
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