Leaf discolouration

[Theterpinator]

Hi guys,

Can anyone help diagnose these patterns on some of my lower leaves and give me some corrective action, if needed.

They currently are on 2.5m/l cal mag and 1.75m/l sensi grow, 1m/10l drip clean, 1.5m/l terpinator, 1m/l big bud, 1m/l bud candy 0.75m/l silicate

Thanks guys

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[namvet25]

Is this hydro or soil?

 

[Theterpinator]

Coco

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[Waira]

James-- it looks like some early K related symptoms,... ironically, with K both defc. and toxicity can both cause the same kind of burning at the "teeth" tips like this,... and since you're in coco, either could be the issue... coco can have a lot of native K in it... What brand is it? Iffy quality coco, even funky poorly buffered batches can cause this,... Let's look at your total N-P-K inputs from everything, so get me that info from everything please,... I think the Terpinator is 0-0-3,...
Also, are you doing drain-to-waste on this grow, with about 20% run-off each time?

 

[Theterpinator]

Hi Waira,

It is canna Coco professional the medium. Growing in autopots with air domes.

Below is a pic of all the nutrients that i am currently using.

If you can please advise of some corrective measures if it is indeed k deficiency.

Thanks again

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[Waira]

all good there, and roger that on the Autopots,... thanks for the pics, and my bad, i meant to ask for your schedule and dosages of them,... overall, it's a bit K heavy, but again I need the dosages to evaluate,... how's the res' pH been, any big drifts? .... unrelated, the Evolution is redundant, overlapping with what Big Bud and Bud Candy have,.. too much of anything can have negative consequences, especially in a reservoir,.... Have symptoms progressed?

 

[Theterpinator]

Hi Waira,

I checked the Res once for pH a few days after putting the mix In at 5.8, I think it had drifted up to 6.5 or so. I was thinking the A/N pH perfect would take care of it.

As a guide, the highest I have gone so far is half strength of the recommended amounts. I actually came down on the a and b sensi bloom from 2m/l to 1.75 last res fill.

Last res was 1.75m/l sensi a and b bloom, 2.5m/l cal mag, 0.75m/l silicate, 1m/10l drip clean, 1.5m/l terpinator, 1m/l big bud, 1m/l bud candy.

Symptoms don't seem to be progressing to be honest.

What corrective action if any do you recommended Waira to halt it and remedy the problem.

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[Waira]

... nute conc. is okay, but dilution also means dilution of it's buffering capacity, which works only in solution, not in the pot itself,..too many other influencing factors there! Have you looked up the Autopot section here? Look for Hansbricks in particular, and see where he and others set their nute ppm's... something you should do when using a res' of any kind,.. get a EC or TDS meter for this,... the pH drift wasn't locking out K at that range, so there's that good news,... Check out the Autopot folks, first, but maybe a slight increase in PK is warranted,... Oh, your water source is part of the reason for pH drift, that filter does nothing much to remove CaCO3, which is what's involved with pH buffering in water,... (carbonates specifically)....

 

[Theterpinator]

Hi Waira,

Thanks for your guidance.

Just been In the tent and pulled off some of the lower leaves of the other plant that were going yellow and dying off. Is this normal, they were right at the bottom.

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[Theterpinator]

The other end of the spectrum the tops are looking amazing.

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