Crispy brown leaves, spotting.

[jordanwh]

7 Pure power plant clones, 2 in Roots Organic and 5 in Ocean Forest.

Started seeing fading in the 2 in Roots organic, started feeding MegaCrop & 1g per gallon (1 part from @GreenleafNutrients) and have been increasing dosages each week as well as starting Cal-mag at 1/4 tbsp now up to 1/2 tbsp. I’m at 4g per gallon and 1/2 tbsp Cal-mag without a change in color, and now starting to see spotting. I started to see some burn at 5g per gallon with the plants these cuts came from.

The 5 in Ocean forest were getting burnt from the get go, Instead of flushing I have been watering with extra run off and it’s been working, opened the tent today to see brown crispy leaves curling up as well as more brown spotting on the other plants.

 

[Beachwalker]

pH, ppm, lights?

I got to say right off I had issues using the Mega crop product right from the start on my ffof soil, I am not a fan of it, however in your case I suspect it might be something else going on?

 

[jordanwh]

pH?

Ph going in is between 6.2-6.4

I use the fresh water dropper and seems to be fairly accurate, perhaps it’s time switch to a pen because even being a newbie I know something else is going on here. Could very well be lockout since I’m up to 4g per gallon without a slight change in fading.

 

[Beachwalker]

Steady 6.5 for best results in Ocean Forest. Btw I use ocean Forest too

I suspect your pH may have been locking something out slowly, and now I think it's starting to show up more clearly

I would get both pH and PPM meter and learn to calibrate it and lock your pH on point. I think you might turn your issue around with just that simple fix ?

Just so you know they changed the mc formula now it's a new Mega crop blend they have out because many people were having problems with it, particularly LED light users, but I had Cal Mag problems under both HPS & MH as soon as I started using it, never had a nutrient related problem before or since the mega crop. I recently bought J R Peters / Jack's used it before never had any similar problems to the mega crop

 

[Renfro]

6.5 and if you get off be a little high not low. It amazing what a little change makes. In veg I never notice a problem with a lower pH but once in flower they need more nutrients and the pH has to be spot on.

 

[Chip Green]

Ph going in is between 6.2-6.4

That range, with the concentration of Megacrop going into that FFOF, your actual soil PH is most likely below 6 at this point...….. Hot lockout extravaganza...
I've had a lead role in the same play, you are currently performing in.
A quality PH soil probe is what got me on track with those particular products.
FFOF is claimed to be 6.5(ish) out of the bag...... My Bluelab disagrees....