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Re: [APD] Cation Exchange Capacity
Derek wrote:
Why do we care if the substrate has a high CEC or not?
I tend to not care, and I don't think with aquarium situations, it plays
that big of a deal. CEC is probably most important for agricultural
crops, with rainwater leaching expensive ferts aways. The home gardener
can sling a little 10-10-10 on their azaleas every year and they'll grow
just fine in clay or sand. As stated, there is not much leaching taking
place in the aquarium. The binding sites aren't that important in
capturing nutrients, especially if you have added plant spikes, etc. to
the substrate. If they're in the substrate, they'll remain there. I've
grown great aquatic plants in substrates with low and high CECs. I did
some testing for Dave's Planted Aquarium Magazine a few years ago and I
have the article on my website. I tested several brand name substrates
for different parameters and it gave me a good idea what was out there.
http://home.earthlink.net/~kaydeejay/substrates.html
Jamie <'\\\><
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