[APD] P and K low level marker plants

["Toni" <xisco__ at hotmail_com>]

Do you know some plant being good  phosfate and potassium low level marker, becuse is the first to show-up deficiencies?

For nitrate a good one is Micrantherum umbrosum
For Fe Ceratopteris cornuta (floating culture)
And for P and K?
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