Calcium or phosphorus deficiency? Or something else?

[ThaPollinator!]

Hello all,
Out of the shadows looking for some opinions on what this may be. I'm thinking calcium. My notes for this round are sh!t and not sure if I flubbed her feed. Forgotten cookies F4 at 62 days. In HP promix under a HLG 350r. I have it dailed way, way back. Probably between 150 - 160 ppfd. Feeding sensi bloom a&b with GO calmag, bud candy and overdrive. I don't see this on any of my other plants and haven't seen it in previous runs of this strain. I'm guessing I had stoner moment and missed the calmag for a feed but would appreciate any advice from anyone who may have encountered similar. Going to continue on with normal feed looking for any changes. I'd hate to throw her further off trying to chase a problem that may already be correcting itself if I only screwed up on a feed or two. Guessing another 3-4 weeks. The buds look ok but seeing some weirdness on the leaves. I could be completely wrong. Anyone care to help in the diagnosis? @Waira


Thanks!

 

[MaskedPlants]

Those leaves really are dark green, which would mean too much N, maybe it's just the light in the pictures? Are they really that dark green?

N in excess will lockout K and induce a deficiency. But take it with a grain of salt, an expert will have to chime in!

 

[ThaPollinator!]

Those leaves really are dark green, which would mean too much N, maybe it's just the light in the pictures? Are they really that dark green?

N in excess will lockout K and induce a deficiency. But take it with a grain of salt, an expert will have to chime in!

I hadn't considered that. Looking at the entire tent and she does look a bit greener than the rest. You may be onto something there. I haven't mixed up the next feed yet and have some time before she dries out so I'll wait for some more replies.

Thanks dude!

 

[CannabisMingus]

What's weird is how regularly-spaced the spots are. When I have had Ca def my spots are all clumped together in groups or around margins.

Edit: Never mind - I looked at Waira's guide and you can see that in Ca def. I'm interested to hear what the diagnosis is.

 

[ThaPollinator!]

Intrigued by the grouping comment. I rarely if ever have any issues using the sensi bloom line and have only pushed over 1.25 ml per liter for 1 or 2 strains but thinking back I sort of recall not wearing my glasses for mixing up one of the feeds and very well could have bumped up the A without having even known it. lol. Too much N is beginning to sound more plausible. Waiting for some more expert opinions.

 

[CannabisMingus]

I don't think N tox reflects spots like that but I will let the experts chime in.

 

[ThaPollinator!]

Gotcha. But now that I'm looking closer, I'm noting the dark green and now seeing the tip burn so may indicate some N tox but was just going back through the quick and dirty deficiency thread and thinking maybe there was a ph flux. I know I'm using "PH perfect" and all but maybe....>???

rapid pH flux: ..more generalized in symptoms,..may look like other things such as root problem's, certain defc.'s, or toxicity...

 

[MaskedPlants]

N tox won't make spots appear, no, but a K deficiency caused by the abundance of N will create brown spots on the leaves in the early stages

Edit : I would still PH even with 'PH Perfect' nutes, it's mostly a marketing scheme by AN.. I would not risk it if I were you

 

[CannabisMingus]

Edit : I would still PH even with 'PH Perfect' nutes, it's mostly a marketing scheme by AN.. I would not risk it if I were you

+1 based on past experiences

 

[ThaPollinator!]

Thanks. I appreciate it. I'll check my upcoming feeds to be sure that's not the issue. I have a whole tent of other plants that look healthy and happy though. Personally I don't think it's that much of a scheme tbh. I can't even count how many plants I've ran with AN and never have problems. I don't think it's bullet proof by any means however and I have been way more lax this round. Not even keeping notes as consitantly as I had previously. Started 3+ years ago growing organically to many false starts, stunted plants and deficiency/toxicities so I switched to GH but grew tired of having to re-calibrate my pens. Planning on making a batch of super soil this year though and hoping to revert back to organics.