That is a Nitrogen + Magnesium deficiency. The yellowing of leaves is the nitrogen, and the brown spots is magnesium. Get Cal-mag like what was suggested and add in a like 1/16th or 1/8th dose of your GROW formula with the next feeding. I enjoyed learning with Techniflora's Recipe for Success. Its only 32 bucks and has TONS of products to try.

I have had this problem also. It started in 4th week veg and continued. I am now at 8 weeks flower so I will get some buds but it looks like one of my plants may die before I harvest Friday. I tried all kiknds of things first I flushed then I bought Cal-Mag. I never did get it corrected. Not sure the problem I know for sure it was'nt over-feeding or over watering and the Cal-Mag didnt really help.
My last thought is that I have a Ionic Breeze located in the ajoining room going on all the time and maybe my issue was that, are you using any ionizers for odor control?

[QUOTE=theloadeddragon;3333785]you can buy pure calcium and magnesium powders...... but it is best if you don't know exactly how to use it, if you get stuff premixed and concentrated specifically for botanical use ........ I sent you a pm about using it with the Fox Farms..... that is the question I have..... at what rate have you used the slow release powders?[/QUOTE] Well, I also use all fox farms soil, nutes and micros, what is the big secret about using the cal-mag bonticare concetrate? I used it, at what ratio, Should I have

I just bought the Cal/Mag plus by botanicare i hope this shit works.

it is not mag. i have the exact same problem right now. mag def is shown BETWEEN the veins along with praying leaves pointing straight up. what we have is coming straight from the veins themselves. turn the leaf over and you will see that the veins are dying first. it is something else.... i am stumped

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If I have to say Nitrogen in this thread one more time I may well....
The calmag plus has N init doesn't it?
Feed me Seymore!

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I don't see a problem with growing small quantities of cannabis to supply ones own medicinal needs. I do not par-take in, or condone, the illegal growing of cannabis for commercial purposes.

yes it does have nitrogen in it 2.0%, damn this morning my flowers look even worse. I think they might be dying.

lower leaves only? Leaves that have been damaged will not be "repaired" by the plant, but replace, get em all off and continue on

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THELOADEDDRAGON'S Perpetually growing perpetual grow
THELOADEDDRAGON'S 2009 Outdoor

i pruned off the lower leaves yesterday and today i noticed top leaves are messed up and dried up. Its targeting mostly the fan leaves.

ill post some pics in a little bit