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Roger Miller wrote:
> According to the "classic" model for cation exchange, positively
> ions are bound to negatively charged particles in the substrate or
> The binding sites are pretty much always occupied by something (if
> then the soil or substrate will take on a net negative charge); to add
> something new to a binding site it has to be exchanged for something
> that's already bound there (hence the "exchange" in "cation exchange
> capacity"). This is a completely reversible reaction.
> Removing an ion without exchanging it for something else would take
> work (this involves exponential functions with upper case chi's and
> F's and it's really way too messy for me to think about). I think
> get around that by transporting positively charged ions out through
> roots and trading them for the ions that are on the exchanger. There's
> some sort of work involved in that, too. But its easier to think
Maybe I'm showing my ignorance here, but does anyone know
exactly what the plant is trading off in this process?
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