Is This Mg Deficiency?

L

Los Muertos

Active Member
I've only got about 2 weeks left, but just so I know next time is this mg deficiency? It cleared up after a few shots of Earth Juice Microblast. Well, it didn't get any worse, but the leaves that were affected never greened up again. Would mg deficient leaves ever get their color back? Other than the ugly leaves, the plant looks great. I say about 50% of the leaves were affected in some way, but the pics were the worst ones. Mostly on the bottom 2/3. Any opinions would be appreciated.




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most damaged leaves will not regain color, regardless the reason for the discoloration. basically when the plant isn't getting what it needs from the soil, it will take it from old growth in order to keep growing. the browning dying leaves are the ones the plant decided were the least useful, therefore the nutrients came from there. it does look like an mg def. looking at the leaves, but it could also be iron, depending on where the yellowing leaves are located. are these old growth or towards the top of the plant?
 
RRLBT420 said:
most damaged leaves will not regain color, regardless the reason for the discoloration. basically when the plant isn't getting what it needs from the soil, it will take it from old growth in order to keep growing. the browning dying leaves are the ones the plant decided were the least useful, therefore the nutrients came from there. it does look like an mg def. looking at the leaves, but it could also be iron, depending on where the yellowing leaves are located. are these old growth or towards the top of the plant?
Click to expand...

I had it narrowed down to iron or mg, but I was just going by those illustrations and they all look the same to me.

It's almost exclusively older growth, the top 1/3 is totally unaffected. Really, mostly just fan leaves.
I posted when it first started and everyone seemed to agree it was mg. You can see what it looked like from the beginning here:
https://www.rollitup.org/marijuana-...tely-need-help-yellow-leaves.html#post5636420
Ignore the first set of pics, didn't realize the hps fucks 'em up. It (obviously) got worse, but eventually stoped.
Since the Microblast has iron and mg I don't know which one it ended up being. My ph has been pretty much dead-on 6.7 the whole time. I did accidentally give her more k than I should've a few times during veg. Would that make any difference? I know it's pointless to worry about it now, just like to know for future reference.
 
they are probably correct with the mg deficiency. iron would effect new growth not old so i think you'd be correct in supplementing mg. but as max said, 2 weeks before harvest it won't necessarily change anything either
 
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