reoccurring deficiency

I have had the same reoccurring deficiency for the past several grows during both veg and flower phases.
After reviewing several posts including the Guide to Nutrient Deficiency and Toxicity thread I believe it to be both a potassium and magnesium deficiency.
I was hoping to hear from some growers who have more experienced then it when it comes to this aspect.
I will measure runoff ph and ppm as soon as I get a chance.

Specs:
-indoor
-Strain: DJ Short's BlueBerry (first 4 pics) and a True OG (final 5th pic)
-pro-mix hp (premix 10gals of promix w/ 2 tblsp of dolomite lime and ironite from Home Depot)
-feed using RO water
-pictures are of 4 week old plants vegging
-soil drenched once every third or fourth day depending on each plants water uptake
-nutrients every other watering at half strength using Pure blend Pro grow, silica blast, & liquid karma

Every grow huh? That's odd, same nutes? How did you correct it last time? I would add some unsulfered molasos with mag and K some brands have 8% each its a good boost. Aswel as feed mico organisms improving soil health and quility.your using ro water are you adding calmag you said you added lime that should supply for awhile.

keep it real. said:

Every grow huh? That's odd, same nutes? How did you correct it last time? I would add some unsulfered molasos with mag and K some brands have 8% each its a good boost. Aswel as feed mico organisms improving soil health and quility.your using ro water are you adding calmag you said you added lime that should supply for awhile.

Click to expand...

yep :/ and same nutes. I never really got it corrected exactly.. It seems to be most prevalent during the veg phase of growth. I just recently setup my RO system so I still need to grab a bottle of calmag. I thought maybe the ironite I premixed would supply sufficient calcium/magnesium.

I believe it is mainly occurring on the older fan leaves.

I am getting back into the swing of brewing AACT's so hopefully I will see some improvement once I add the brew. I am using ancient forests by GH and feeding fungi/bacteria with seaplex and molasses. I'm letting it brew for 36 hours

Any one else's input... i'd appreciate it

It looks like a Manganese def. It's a rare def but it can happen. Too much Fe locks out Manganese and too high a PH.

2 tblsp of dolomite lime and ironite from Home Depot

There's your problem right there, Iron locks out manganese!

So what's the pH?
...I think there's something wrong with your newest growth..it's brighter than usual - Pic 3 & 5 - looks like Fe or Zn to me, micronutrient deficiency somehow.. high pH perhaps?

In Pic 1, the stems and petiole of the badly affected leaf are really dark purple..but the other ones aren't..
P or really bad case of Mg?? Not sure, just guessing..

I'd do has "keep it real" said..molasses improve nutrient availability

10 G soil w/ 2 tbsp of lime? Or 2 tbsp per gallon?