[APD] Peat as sponge?

["Seweryn Bialasiewicz" <s_bialasiewicz at hotmail_com>]

Hello,

The recent posts about peat made me think about the peat I have in my 
filter, as well as the merit of adding peat to fertiliser balls/ agar. So 
does the peat act as a sponge for excess nutrients, leaching them back into 
the water when the nutrients' concentrations drop below a certain threshold. 
Or does the anions in the peat bind the nutrient cations and hold them there 
until a plant root hair comes into contact with the peat and strips it of 
the bound nutrients?
Someone please enlighten me...
Cheers,
-Seweryn

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