white-yellow lower leaves with tip and edge necrosis, spreading upwards, PICS

C

careca.frito

Member
Hello everybody

I'm growing some plants on a 1m by 1m grow room under a 250 W HPS light.
They grow on good quality potting soil which I added perlite and dolomite (tap water pH here is 9)

Plants are now in mid stage flowering and start getting yellow leaves, that at some point got almost white.
The worst one is starting to get edge and tip necrosis.

Due to the fact I was using dolomite, I wasn't lowering the pH of the water until a couple weeks ago.
Since then I only gave them around 6-7 pH water which I lowered with H2PO4-

Symptoms got a lot worst the day after I watered them with a low dose of nutrient solution.

So I flushed them, but got no change.

All plants are affected, but the pictures here are of my most affected plant, but it's evolving quickly in all of them.

Any solution is really appreciated and if there is more info you need just ask!

Thanks
 

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Coho

Coho

Well-Known Member
The plant is eating its leaves for flowering nutients.. Did the nutes have nitrogen to help it?
 
Coho

Coho

Well-Known Member
I never go strong.. Give her some flowering nutes say 1/2 dose. Most drop some leaves flowering unless in big pots and good nitrogen/nutes.
 
hydrosoil78

hydrosoil78

Active Member
it doesn't really look like a problem . give it fish emulsion or chelated iron for iron deficiency if you want but I would say no more nitrogen or fish emulsion after halfway in flowering. The leaves energy is being used up making the flowers I think but the new growth looks fine
 
C

careca.frito

Member
it's super skunk.
i know a lot of old leaves get yellow and fall down during flowering, what started worring me is that it's spreading up quickly, and at all my plants....
 
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