Need deficiency help please

[john0108]

hey fellas need a bit of help.
I have 2 DP AutoMazar's in week 7. They have both been fed/treated exactly the same. The smaller one @630mm seems fine but the larger one @960mm even though bigger seems to be behind and showing deficiency's.
They are in 10l airpots with coco under led, temps are between 21-26c, Feed is 1ml CalMag, 2.5ml Canna A/B, 4ml Canna Boost, 2ml Canna Rhizotonic PH'd to 5.8.
The pre flowers on this one are definitely a bit behind its sister.
I've read through the stickies but am new and not confident to diagnose and come up with a cure.
Thanks for looking.

 

[LED Borg]

PH 5.8? seems a bit low to me, I always try to get around the 6 - 6.2 mark. might be your problem aswell as a CalMag lockout? stabbing in the dark here bro but im sure peeps will be in here soon to sort your prob out.
One good thing to do tho is PH test your drainage water, that should tell you whats happening a bit better.

 

[namvet25]

Is your feeding dosage per litre or gal?

 

[john0108]

Hey namvet its all per litre.

 

[namvet25]

It looks like cal/mag def and also nute lock out.What are the npk numbers of all your feed?

 

[john0108]

Cheers for helping.
The canna A/B is 5-4-3 combined
Rhizotonic 0.6-0.2-0.6
Canna boost 0-1-1
CalMag 2.6-0.1-0.3

 

[namvet25]

I'm not familiar with canna nutes are they organic or chemical.If there chemical I suggest you flush with plain water than feed her your flower nutes along with some cal/mag but give her at least 10 mil per gal of your cal/mag because it's a lower consentrate than some other brands.If your nutes are organic then forget flushing and just feed her but I would also raise your intake water to around 6.5. Flowering plants need more cal/mag especially when your using LED'S and you really can't over feed cal/mag.

 

[john0108]

Cheers Namvet, no mention of organic so I presume they are chemical. So I've given her a real good flush and fed again with 2ml per ltr CalMag will see how that goes and post up the progress. Oh Ph was 6.3...

 

[Joe383]

I have only had plants look like this from over feeding. After your flush next time I would suggest not feeding directly after a flush and giving the plant a few days to recover before introducing nutes again.

 

[john0108]

Hey Joe at the risk of sounding really dumb ( please don't hurt yourselves when you fall of your chairs laughing) what's over feeding?
I had been keeping the nute down to avoid this but as I thought you couldn't over feed in coco I had been putting 1.5 litre's a day through the pots. Thinking about it even though they seem quite dry at the top the weight would indicate they have been holding quite a bit of feed.