Re:Re: Bacteria algae and N:P

[Luca Specchio <lucky_luca at mclink_it>]

At 03.48 12/01/2001 -0500, you wrote:
>What I *should* have said is:
>
>If you want phosphorus-limited conditions and have 5 ppm NO3, then you
>shouldn't let PO4 exceed about 0.2 ppm.
OK. But which P? and above all where?

I mean 0.2ppm of PO4 doesn't really mean that much to me. There are so many 
kind of phosphates, and I'm not sure which kind can be assimilated by 
plants and which cannot. Plus plants _already_ contain the P uptaken from 
the water column, because the P uptake's rate is extremely fast! So what 
you measure is the 'rest' of P still in the water.

Last week in my tank I measured:

0.000ppm of PO4 as ortho-phosphates
0.041ppm of PO4 as total phosphorus content (ortho + poli + organic phosphates)

and with N-NO3 content of 0.71ppm ...I *should* be in a P limited 
situation, nevertheless I'm not surely in an algae free condition!

what do you think?

ciao!
luca

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