Mystery Problem - Come Build That + rep

I've had a bitch of an issue which I think is really holding me back, little necrotic spots on my fan leaves show up around week 3/4 and pick up steam right when I need everything looking good. Thought I was Mg Def so I started using some epsom, but nothing seems to work. Would love any help.

Background info -

1. Not neut burn, I under fertilize
2. Not bugs, I've checked
3. Has been happening since I moved to Coco Drip to waste in 5gal (from fence post aero) - 3 cycles now.
4. Seems like impact is strain dependant
- AK gets these spots
-White Russian about the Same
-Critical Jack get really banged up, yellowing of leaves and jut sickly.
5. Yeild is way off, like .30gpw vs. .80 when I was doing aero
6. I've tried two version of Lucas
-2 part with micro/bloom; straight lucas, but @ 7 and 14 instead of 8/16.
-1 part with FloroNova Bloom @ 8ml/g + 1mg/gal Epsom

I've tried a few remedies, but this sucker is about to send me back to Aero or E/F

i have no clue but good luck

what type of room tent , or enclosure? mylar? foil? and how is your drainage? good? bad? decent?

also do you mist? foliar feed?

Room with Tyvek wrap on the walls, no plastic. Drainage is good bonticaire coir over a thin base of perlite. No I don't mist.

gobskiii said:

also do you mist? foliar feed?

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It does look like light burn

I'm having the same problem with one of my plants.also using flora nova bloom.cut out the nutes and just watering with ph water hoping for the best

It does look like light burn

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I agree. You say you are under fertilizing them but I think you are going way too strong. I used to run Lucas years ago and from what I remember 7/14 is about as strong as I could go without seeing issues. And im talking 4-5 foot monster at week 6 of flower. On top of that your adding 8ml/G of floranova bloom. What is your ppm/ph?

Aren't those spots usually a ca problem? Are they kinda crusty and rust colored?

ya im willing to bet is is a calcium def. calmag dude.

hymem said:

7/14 is about as strong as I could go without seeing issues. - On top of that your adding 8ml/G of floranova bloom. What is your ppm/ph?

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Thanks, but Lucas is 8/16 if using 2 part which I started with at 7/14 I'm at like ~975PPM. I don't ADD 8ml of floranove, that is a 1 bottle lucas which I swithced to. These are not formulas I use at the same time EVER.

Yes, redish. So I think it might be calcium too, but here is my nutrient profile for the the FloraNova + Epson. Maybe a def from Ph lock-out? never had that in E'n F or Aero but maybe with the coco it's an issue.

Nitrogen N Total 121
Phosphorus P 105
Potassium K 176
Magnesium Mg 86
Calcium Ca 121

Thanks, but Lucas is 8/16 if using 2 part which I started with at 7/14 I'm at like ~975PPM. I don't ADD 8ml of floranove, that is a 1 bottle lucas which I swithced to. These are not formulas I use at the same time EVER.

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My mistake. That would be crazy!

Anyway, where exactly are you seeing this deficiency? Calcium is not very mobile which means Ca deficiencies occur around the top of the plant. If this is where you are seeing the deficiency than it could be the correct diagnosis. Dont forget that a high PH can induce multiple micro nutrient lockouts at the same time making the exact diagnosis difficult. More pics would be nice.

Although worse at the top than the bottom like calcium I think the root casue is lockout due to PH being too high for coco. I was not checking the run off, only the input flow. Anyhow, I chopped the last round recently so now I've cleaned everything up, and am reverting to CalMag instead of Epsom for this cycle and will monitor the run off too.

Thanks. I'll post more pics if it happens again.