[APD] P and K low level marker plants

["Daphne Freeman" <daphne_freeman at charter.net>]

Patrick,

It has been my experience that with potassium deficiency, you get little
pinholes in the leaves.  With iron deficiency, leaves take on a yellowish
hue.  I don't have hygro but that is what my other plants have done.  FWIW,
I have also noticed that my rotala macandra looks beautifully red when my
nitrate is low.  

Daphne

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