Assistance Needed Diagnosing

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Growinmitties

Member
Hello all! First grow, straight to the point.
My initial assumptions are mixed, PH, phosphorous, or calcium. Haven't pinned it down, but took some steps, waiting to see how results go.

Sob story below if anyone can help investigate. Please though, suggestions for new products are fine, but im not interested in reinvesting unless absolutely needed. I'll either make it work or learn a lot in failure(hopefully lol)

35 days in from germination
Indoor 2x4x5 tent
1800w x6 cob led (290-310 from wall)*
Promix bx, soilless medium (around 5.8 unamended)
Tap water ~130ppm at 7.0ph
Nute feed ends up 6.2 most recent, 6.5 before that
AN 3part ph perfect (yaya, bought it, needs to get used)
Purple kush, feminized autoflower (sonoma)
19/5 lighting
16-23C / approx 60% humidity. I still get some humidity spikes for 30m-1h each day at lights-off that i cant seem to shake until the weather clears a bit more for venting. Still snowing this week, anf it gets cold enough aleady (basement)
Check for pests, but didnt notice any, ph should be in and around decent, but will have to do a root zone test later tonight.

Started nutes super light in veg was playing borderline N-tox, so i havent pushed too hard. Last nutes befote problem were 850ppm start of flower, went 1100 last night as scheduled. Ppm is approx, meter has always been a bit wonky, enough to get by though.. so far..

Had some spotting earlier in veg, looked like splotches of brown [pic1] assumed P-def or splashing from watering if i missed any pooled water on leaves.

Everything going well, started flowering, had a nice little stretch. Got some ideas playing with the plant to see how much i can beat her up, havent broken anything yet lol. Ive got more than enough adjuatments planned for next grow. Havent done this since.. 20+ years i guess. Things are different lol. I was never hands on then anyways, so its all new now. Noticed some more spotting, nothing out of the ordinary so i truck on. Came home from work and Boom, lots more affected leaves. Been digging around. Lots of pics -close- to what im seeing, but slightly varied and confusing enough for me to make an account and ask for help!

Other pics im hoping upload in order, for progression of the leaves. Sorry, todays pics have the blue lights on still, some of the newer leaves showing it now also. Still havent nailed turning it off when taking pics consistently lol.

Smaller plant has always been a bit behind, leanred some things as i went side by side. Very different status atm.

Anyways, if you've made it this far, thanks. Hoping someone with some exp can help me along, in case I get crap results.

Ive got am/pm photos each day so far, in case anyone wants to see them and logs for every day i did something, environment- or plant-wise.

Last pic to show the lovely colours.
Thanks for any and all help! Much love!!
 

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G

Growinmitties

Member
Eh, maybe premature to post. I DID skip a feeding and watered only ~1.5wks ago, was afraid of N-tox that ive already settled on was from the fans, so i might've made them start to fast a bit. She has been sucking up a lot of water lately.

I'm not in full panic-mode yet. It just really surprised me how quickly **heavily stressed** it escalated. Not fun coming home to a good half dozen newly borked leaves.


Just got in, at first glance it doesnt look like it progessed anymore yet since feeding 24hrs ago, and no additional stress yet. Current photo attached.

Its even across new/old, so i guess still could be ph? Maybe the feeding helped balance that a bit too. I dunno.

Making supper and taking soil'less' sample for ph test.
 

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Growinmitties

Member
Starter setup. Fully intend to improve in the long run. Bigger tent and qb's ive been reading up on. It'll take me a bit to get there lol.

Gotta try to stick smaller for autos, or train the hell out of a photo in veg. Height and lighting is a lot to consider. Limited by the 6ft ceiling in basement. Dropped ceiling, but no room.. alas, floor joists. Goodbye gym equipment too lol
 
G

Growinmitties

Member
andymex said:
You have 1800 watt of cobs in a 2x4 tent ?
Click to expand...
And my skin is farrrrr too pale for that. I like being in my tent currently, without the smell of man-flesh searing. Id likely catch a sunburn if my bathroom vanity had all three incandescents screwed in, rofl.

Sorry, bored waiting for bacon.
Realizing this might send you a notification now for bs banter /grin
 
G

Growinmitties

Member
Growinmitties said:
Post slowly awaiting approval as the relevance to my inquiry fades. Ill check back tonight after work.
Click to expand...
Calcium. Colours are a lot more evident now. Swear it started off as darker splotches, thought it was spillage or P-def. Then it bronzed, them started speckling. In case any new growers run into same issue i guess. Maybe an experienced grower can confirm. I'll post some recent pics later tonight. May as well document it a bit. Never hurts right? Lol

Just over-thinking things i guess.

Ca makes sense. Very little dolomite lime, and/or slower to break down in the mix, coupled with LEDs. Gonna go shop around for something that's not gonna cost me an arm and a leg for shipping.
 
andymex

andymex

Well-Known Member
Growinmitties said:
Calcium. Colours are a lot more evident now. Swear it started off as darker splotches, thought it was spillage or P-def. Then it bronzed, them started speckling. In case any new growers run into same issue i guess. Maybe an experienced grower can confirm. I'll post some recent pics later tonight. May as well document it a bit. Never hurts right? Lol

Just over-thinking things i guess.

Ca makes sense. Very little dolomite lime, and/or slower to break down in the mix, coupled with LEDs. Gonna go shop around for something that's not gonna cost me an arm and a leg for shipping.
Click to expand...
I would like to help buy I really don't know what is wrong :(
 
andymex

andymex

Well-Known Member
I'm no expert but if I had to make a guess it would be your temps. I use Promix and know from personal experience that promix has a good amount of lime that works as a ph buffer so I don't think ph is your problem even more as the ph of your nutrient mix is good. Calcium deffienecy also does not seem likely to me because promix has calcium(lime). Another possibility would be the alkalinity of your soil. How much have you been feeding ?
 
Tangerine_

Tangerine_

Well-Known Member
I think you're on the right track. They have a touch of N tox and they're having trouble with Ca and P uptake.

ANs calculates their nutrients on the 700 scale. You're last feed was at 1150 and that's too high IMO.
You need to get that EC/PPMs down and your temps up
 
andymex

andymex

Well-Known Member
Tangerine_ said:
I think you're on right track. They have a touch of N tox and they're having trouble with Ca and P uptake.

ANs calculates their nutrients on the 700 scale. You're last feed was at 1150 and that's too high IMO.
You need to get that EC/PPMs down
Click to expand...
The claw right ?
 
andymex

andymex

Well-Known Member
Tangerine_ said:
I think you're on the right track. They have a touch of N tox and they're having trouble with Ca and P uptake.

ANs calculates their nutrients on the 700 scale. You're last feed was at 1150 and that's too high IMO.
You need to get that EC/PPMs down and your temps up
Click to expand...
He also claims his temps get as low as 60f in the day. Could that be affecting nut intake ?
 
Tangerine_

Tangerine_

Well-Known Member
andymex said:
That is why I think that the "calcium deffiency" that appears in the leaves might be a cause of an alkalinity issue in the soil.
Click to expand...
AN is super chelated and "should" provide for a wider uptake range

I'm leaning toward overfed and cold.
andymex said:
He also claims his temps get as low as 60f in the day. Could that be affecting nut intake ?
Click to expand...
I believe so.
If the room is 60, the roots are even colder.

A little experiment. Put a couple plants on a heat mat and watch how they respond
 
G

Growinmitties

Member
Tangerine_ said:
I think you're on the right track. They have a touch of N tox and they're having trouble with Ca and P uptake.

ANs calculates their nutrients on the 700 scale. You're last feed was at 1150 and that's too high IMO.
You need to get that EC/PPMs down and your temps up
Click to expand...
Ahhh likely on to something. I forgot about the 500/700 scale thing, ill need to revisit their charts.

I might have misled a bit with the 1100 statement, was definitely less than that, kind of lol. Doesn't matter. I was reading up a bit on the deficiency stuff, and had noted the n-tox possibly locking out the phos and calc, and it was an issue earlier on. I dod have to rearrange a bit, they had been pressed against the wall a bit, but i do see some that couldnt have been, still showing claw also. Thanks. Ive had to water again yesterday as they were both light again.

Should i add another watering before feeding again you reckon?

Stuck on temps for now, those should get better as it warms up, still have snow in my yard :(
This was first grow, baseline test. Managed to get my temps and stuff recorded during the -30-40 weather. Hits the low end for sure, but its doable. The pots definitely needed to be off the floor.
 
G

Growinmitties

Member
With the 500/700 scale thing, if im understanding it correctly; im thinking 1100ppm, ec comes out around 2.2, but at 700 scale im at like 1540 or so. Correct?

Fuck, wait. Lol, im forgetting i dont want to be running AN at full strength anyways, I think there was another *0.75 (or slightly lower factor) needed in my feed calcs
 
G

Growinmitties

Member
andymex said:
He also claims his temps get as low as 60f in the day. Could that be affecting nut intake ?
Click to expand...
Do you know any good reference material regarding soil temps vs ambient temps, like how much lower i can expect it to be (ballpark i guess, too many factors) or better yet, anything about nutrient uptake at various temps? Sounds interesting
 
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