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  Re: Soilless mix
From: "Celeste Whitlow" politicalamazon at charter.net> on 2002.04.04 at 16:37:17(8463)
CEC stands for "cation exchange capacity," and it is a measure of how
"fertile" the soil is. It indicates the soil particles' ability to hold on
to "fertilizer" (minerals) which exist mainly as cations in the soil
solution (water in the soil). If your soil has a higher CEC, they say you
don't need to fertilize as often or as much.

Soil/media with a lot of organic matter has a high CEC. Clay soil has a
high CEC. These both, obviously, also hold a lot of water which is not good
for aroids, from what I hear.

Sandy soil has a low CEC. So you get excellent water drainage but low
ability to "hang on" to fertilizer and water.

I would think that in a large commercial operation, they probably
"fertigate": that is, every time they water, there is fertilizer in the
water. Often that is how it is done with other plants. Again, aroids may
be different.

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