Phosporous Deficiency?

[MedGrower]

Very good advice here yet again! I've had similar symptoms with Remo before and took it as a sign to raise the lights a bit and it has helped.

Agree with @Waira that it looks like Ca def. but I also want to chime in with @Rev. Green Genes that is generally a good idea to run pH 5.8 at latter part of generative cycle. Done many succesful grows at 6.2 but every strain/pheno/enviroment is different.

Also perhaps bit too late to fix Ca deficiensies so better to close out the other issues and ensure proper P uptake. Hope you ride it out to sunset nicely! Looking good regardless!

 

[Waira]

oops!-- Sorry @Borodan

I fixed it in-post as well,...
That squirrely pH is almost certainly behind this, in particular the dip into the too-alkaline side... given that everything happens faster in hydro', the suddeness of the appearance is also what makes me think B (most likely suspect, fits best) or Mn defc.,... not to say Ca defc. can't be happening at the same time, but with the pH going toward more alkaline, Ca availability increases, so lockout there isn't a factor/between your water and the nutes, lack-of defc. seems unlikely, but some strains can be real hogs, so maybe that one with the finer spotting is needing a boost, or was feeling the light intensity worse.... When you get symptoms that have some overlap in appearance with other nute defc.'s, and/or more than one defc. is in play, it muddies the diagnostic waters! ......... The purple/red petioles are not good indicators of P defc., as you saw with yours, that the color has been there early on means it's part of normal color expression, a common one too,...
-- frustrating to not have what you need readily available! Lemon juice, vinegar, citric acid, all are weak acids and have poor staying power; they work, but not for long, especially in hydro,...
.... are symptoms progressing still, or halting? If your pH is under control again, and nutes uptake back online, it should,... I'd still get more micro's going if possible, or at least try adding a B source (Borax, or some contact cleaners are Boric acid),....

 

[Waira]

Med' buddy! ... here I am barking about B defc! That second plant (purple-ish) I think is mainly Ca defc., but the other, from what I've seen of this defc. in other grows here, fits B defc. best,... it's how it hits only the uppermost fans and the patchy interveinal necrosis that's the tell to me,... also, the pH drifting to the less available side,...

>>> @Dabber ... well, with a shotgun blast of nutes like that, it's impossible to say what it was that fixed it,... this is a hydro grow too, BTW, worlds different for pH availabilities,.... a word of caution too: there is no such thing as Ca-Mg defc, it's one or the other,.. they often occur together (some metabolic ties there), but not always, and they are very different in actual roles and mobility; Mg is fully mobile within the plants, Ca poorly at best,... this means it can't be translocated from established tissues to new growth when needed,... different symptoms, hitting on the plant in different place too,....

 

[Rev. Green Genes]

Very good advice here yet again! I've had similar symptoms with Remo before and took it as a sign to raise the lights a bit and it has helped.

Agree with @Waira that it looks like Ca def. but I also want to chime in with @Rev. Green Genes that is generally a good idea to run pH 5.8 at latter part of generative cycle. Done many succesful grows at 6.2 but every strain/pheno/enviroment is different.

Also perhaps bit too late to fix Ca deficiensies so better to close out the other issues and ensure proper P uptake. Hope you ride it out to sunset nicely! Looking good regardless!

Very true @MedGrower ! I run at 6 - 6.2 for seedlings, and don't start dropping it down to 5.7-5.9 till second feed. I get a lot of fluctuations though because for several grows I didn't discipline myself to measure nutes very well. Since I have started being more careful and journaling inputs I have had more success. That I think was the biggest lesson learned from pH lockout issues, and stunted plants....

 

[Boradan]

I have the pH at 5.7 now.
Also increased Magnifical and Micro by 0.5ml/l

Lets see where this takes us...

 

[Boradan]

After getting the rez change and waiting 24 hours, I trimmed all of the necrotic leaves from 4 colas to make this easier to monitor.
36 hours later, and no sign of any deficiencies/lockouts on these Colas.
Looks like the flush, change and increased micro nutes worked a treat.

Big hugs to all who helped out in here.

 

[Waira]

nice save mate! .... Fingers crossed it stays in line

 

[Boradan]

nice save mate! .... Fingers crossed it stays in line

Here's hopin'