Necrosis rust spot issue on a few leafs

Hey guys, this is my first grow at week 5 on a few auto strains. Last watering was this morning just after this shot, hence their wilted/dry appearance.

Here are my parameters:

Soil: FFOF
Age: 5 Weeks
Nutes: None until day 21. Had a few 1/3 doses of grow big, a 1/2 dose of tiger bloom once flowing started and then a 3/4 dose of tiger bloom. That 3/4 dose was last week and I noticed some slight clawing. They've had a single dose of cal-mag.
Water Regime: About 2 x per week of 6.2-6.5 PH'd water
Pots: 3G Smart Pots
Lighting: 6x 50W Cree CXB3590

Any thoughts? My first inclination is to give it another day or two before reacting as I am coming off some slight clawing from a 3/4 dose of tiger bloom. Second inclination is cal/mag deficiency because my filtered tap is only 60-ish PPM and they've only had a single dose of it.

What say ye?

Yeah, get your cal/mag up and the rest of your nutes down.

Bugeye said:

Yeah, get your cal/mag up and the rest of your nutes down.

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Thanks for the time man, will do. I just watered them, do you think it would be ok to mix up a gallon of cal-mag to distribute amongst my 5 plants while the soil is still very wet as kind of like a last minute supplement or should I wait until they are dry again? At their current rate of water consumption, that would be late Wed. or early Thurs.

slow_grow said:

Thanks for the time man, will do. I just watered them, do you think it would be ok to mix up a gallon of cal-mag to distribute amongst my 5 plants while the soil is still very wet as kind of like a last minute supplement or should I wait until they are dry again? At their current rate of water consumption, that would be late Wed. or early Thurs.

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If you have a good soil mix with adequate aeration, it would not hurt to add some now.

Ok cool, yeah they are in smart pots sitting on baby plastic egg crate boxes with tons of air flow via 3 clip-ons set to low. Soil is FFOF with no amendments though. Here is a pic from a week ago before that heavy (3/4 dose) of tiger bloom.

Ok done. At the next watering I'll do another 3/4 dose of cal-mag plus and nothing else. Thanks again!

Kind of looks similar to what's popping up on mine, I also just transplanted into FFOF

AllNightInsomniac420 said:

Kind of looks similar to what's popping up on mine, I also just transplanted into FFOF

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Been running FFOF in these 3G smart-pots for these autos the entire grow, zero transplants. Not sure if this is your first time with FFOF but take heed of the nute burn warnings. These plants (spanning 3 strains) thrived from sprout all the way into pre-flower without a single nute added. I assumed since I am on good well water in soil the last thing that I would need would be cal-mag but then realized after picking up a PPM meter that my whole-house filtration system is pulling back out all the goodies haha. Kitchen tap (kinetico inline filtered) PPM was below 10 while the rest of the house (5 micron filter) was at 60. Oh well, I'm thankful for RIU that's for sure.

Yeah it's my first time with ffof and I'm a new grower I was advised to go that route due to multiple deficiencies and I use the trio so I'm not even sure what happened lol I'm learning as I go, thank you for the tip

AllNightInsomniac420 said:

Yeah it's my first time with ffof and I'm a new grower I was advised to go that route due to multiple deficiencies and I use the trio so I'm not even sure what happened lol I'm learning as I go, thank you for the tip

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Tiger bloom also dropped my water a full 2 points so make sure you PH down accordingly after you add it.

Yeah it hasn't done that to me as of yet thankfully...then again we have pretty clean tap, all the measurements on it read just what the marijuana needs to grow or they have been so far haha even after the nutes doesn't seem to change the ph level at all

Hey gents, just wanted to follow up on the post with the results. After the 1/3 dose of cal-mag plus that spot froze. I'm getting some yellowing on the very bottom fan leaves but I have a feeling it might be related. I have yet to give it a full dose of cal-mag plus as mentioned above, just waiting for them to dry out a bit more. These plants in these 3G smart pots go through water so quickly. It has only been 48 hours and they are already drooping, pots aren't quite light yet but I have a feeling by EOD they'll be ready again. I can't wait to bump up to larger pots.

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Thanks brother!