Having trouble diagnosing this, close to harvest please help!

Harvester315

Well-Known Member
Ive been having trouble diagnosing this plant. I have 2 Northern Lights autos in a tent. Probably about 7 weeks into flower (yes autos but they've had a rough life since its my first grow, thus elongating the process I think)

One plant seems to be doing well, smaller buds but healthy leaves, the other seems to be having some kind of burning at the sugar leaves that seems to be getting worse. I've attached a few photos of said plant. Both have been fed PHed water (6.1-6.4) for the last 3 weeks (I cut out the nutes a little earlier than necessary as I was a little trigger happy to harvest thinking they were closer than they were. I bought a microscope fore the trichome test)

Temps go from 73 dark, to upwards of 83 at top of top cola (working on getting it down lower during lights on) I did move 250 Watt HPS a little higher, now about 14" above the girls, but like i said one plant is fine, both same distance from light.

Any thoughts? Advice greatly appreciated!!!
 

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Harvester315

Well-Known Member
Thanks for that reply. I would wager that I am about 1-3 weeks from optimal harvest. Should I water with Calmag at the next water (most likely tomorrow )?
 

Harvester315

Well-Known Member
The most probable issues seems to be a severe magnesium deficiency. I watered today wit only water and calmag PHed to 6.3. If this stops the problem I will let you know, if not, I will be back for more help!
 
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