Brown spots Potassium or Cal?

I started seeing this a few days ago and can't remedy the problem, looks like later stage potassium def and fed some jacks 10-30-20 and just don't seem do be getting any better. So if any of you guys can help me out would be appreciated. My ph going in is usually 6.5 every once in a feeding she bumps up to 6.6. My RO stands about the same and haven't had to many issues on this grow till now.

Are you adding cal/mag to your RO?

yeah been adding the cal-mag to my water and by RO meaning runoff. Like i said it makes no sense to me thats why i said maybe pot. def cause older leaves are yellowing and drying up, inturn could be a root bound issue. Why i say that is can't get my finger into the soil not even 1/2" to even check for soil dampness? I don't know brother i'm stuck!

Your older leaves only, are getting necrotic spots, then a yellowing of a single leaf or the whole compound?

new leaves only , and ones coming out of the bud , older leaves yellowing and turning to paper.

Could it be Mn deficiency?

might be but never in my growing life seen it or experienced it, wouldn't know where to begin to remedy it?

botanist95 said:

might be but never in my growing life seen it or experienced it, wouldn't know where to begin to remedy it?

Click to expand...

http://www.supergrowplants.com/problems.html

Bottom of page.

Take what I say in regards to this matter with caution. I am not a seasoned cannabis grower.

I've read this page many times over the years but it doesn't say how to treat the toxicity of manganese , from what i have read green sand, or foliar feed with nutrient solution high in trace elements. In turn foliar feeding being the best option for absorption i'm mid 4 weeks through flower and don't want to introduce a mold problem soooooooo ?

To my eyes based on that one leaf it could be N, Mg, Fe or Ca.

K deficiency IME starts at the outer edges of the blades.


In all honesty my response to your leaf problem would be to increase my feeding ppm with a balanced nutrient profile. 20-20-20 (jacks classic I think)

But for a more representative solution a whole plant pic followed by problem areas would most DEFINATELY help.




J

Thanx Jondamon and everyone for the insight and i did up my ppm last night when i fed her, my camera sucks its an old cell phone with no flash so whole plant pics would just suck for the viewers eyes (dark and just shitty) so if you want a whole plant pic i could post 1 but wouldn't show much.

botanist95 said:

Thanx Jondamon and everyone for the insight and i did up my ppm last night when i fed her, my camera sucks its an old cell phone with no flash so whole plant pics would just suck for the viewers eyes (dark and just shitty) so if you want a whole plant pic i could post 1 but wouldn't show much.

Click to expand...

Please do try it anyway.

Then can I at least try to see what's going on.



J

done sir

Gorgeous.

ty

Here is my other LK no problems with her yet

Are all of the fan leaf tips turning yellow or brown and curling up slightly at the very tips???



J

Are the leaf blades edges displaying a cour change too?

Orangey yellow edges to the leaf blades edges?


J