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Possible Deficiency ?
>Would someone be kind enough to diagnos what I suspect may be a possible
>Basically, small brown spots appear over the leaves of my plants - these
>develop into much larger holes and eventually destroying the leaves. the
>effect is more noticeable on my broader leaved plants.
>I use PMDD and tank parameters are roughly as follows:-
>PK 6.7-6.9, NO3 <10 mg/ltr, NO2 Nil, Fe circa 0.1, PO4 circa 0.015, GH 5,
>Gallonage is 50 UK Gallons - 2ml of PMDD added daily
Sounds like the classical potassium deficiency to me. Check your PMDD for K
content, you may be too low.
H. polysperma would be affected early in a K deficiency situation, check
the older leaves for holes.
"One cannot know 'enough' unless one knows 'too much'. " D.H. Lawrence