Cal//Mag Problem or something else? Please Help me.

Mg deficiency for sure, add 1.5 tsp/gal cal-mag and you'll be fine

Glad I am on the right track. Thanks man.

Hmmm looks to me to be a good case of P def.(phosphorus)..
The first pic looks a little like strait out blith.but its not.no worry..lol
Has growing slowed or stopped ?blueish and or smeller leaves?
Well easy to fix ..Make sure your p.h.is 5.5 to 6.2 for hydro ,or 5.5 to6.5 for soil.(test water runoff after watering)
If soil is highly acidic,mix a good compleat fertalizer that contains phosphorus and your guanno bone meals(P that is finely crushed for quick absortion). this is my opinion ...peace

Originally Posted by allen bud

Hmmm looks to me to be a good case of P def.(phosphorus)..
The first pic looks a little like strait out blith.but its not.no worry..lol
Has growing slowed or stopped ?blueish and or smeller leaves?
Well easy to fix ..Make sure your p.h.is 5.5 to 6.2 for hydro ,or 5.5 to6.5 for soil.(test water runoff after watering)
If soil is highly acidic,mix a good compleat fertalizer that contains phosphorus and your guanno bone meals(P that is finely crushed for quick absortion). this is my opinion ...peace

This is phosphorus deficiency, notice how the leaves turn yellow before turning brown. His leaves aren't yellowing, just turning brown and it starts in the center of the leaves instead of starting at the tips. That's why I say Mg def.

like with his pics p def starts as brown spots on center of leaf and progresses,no yellowing .mg starts at fring of leaf,likeyour plant in pic.And leaf tips turning brownand curling up also sighn of later stage mg def. like in your pic.you probably got rust spots there to..(but not have to)

So many solutions , what will you do
I have a little food for thought;
Is there any possibility this is a def caused by overfeeding? Getting fert salts built up
Epsom salt is good for mag def. It is also good for flushing out salts from overfeeding ferts. It also aids roots ability to uptake nutes. When in doubt about def problems it is often best to flush out old salts followed by a light feeding of a good organic 10-10-10 or 20-20-20 plant food. After you have made a decision for corrective action watch new growth for any sign issues. There is nothing you can do for the leaves already affected.

First thing I do when determining nute problems is check your soil PH. dualph1.jpg

19753Phosphorus.jpg19753Magnesium.jpgleavedeficiencies2.jpg

So OP, what did you find out? I'm having the exact same issue or atleast it looks exact. At first it appeared as only Mg def (lower leaves), so I treated with 1/2 tsp epsom/gal (only used half gallon and monitored to see if rest was needed; wasnt). Then came the P in middle of leaves (lower leaves). Kept eye on it for 2 days, then it was time to feed anyway, so gave 2-7-7 mix (same K cause slight def started low. Still progressing. 2 weeks into flower, therefor signs of N def (normal), P, appears Mg def is reoccuring; P def is affecting not only the bottom, but mid, and now starting on top 2 days after feeding. pH has remained at 6.5-6.6 throughout entire grow. temps have been 75-80 (i let it go to 80 sometimes a day after watering to help dry somewhat; helps keep humidity between 40-50%). Water and feed has been 6.7-6.8 going in, and runoff/soil have both remained 6.5-6.6. Other forums keep saying pH, but I've had no problem with any other plants nor has pH ever been out of wack for any of them. Same medium, same environment, same strain. Everything identical. Except that this has turned out to look like my best plant ever until this.

I'm about to flush in a few hours if no solution is found (been at it constantly since it started) and then replant in new soil mix. I'd like to think I'm an intelligent human being, but if it sounds as though I've been wrong in my diagnostics, I love to learn. Educate me.

Not trying to jock your thread, just find it relevant for info gathering all around for anyone with same issue.