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[agito]

cant be burn if you had the issue before feeding them are you using coir based nutes

i would not flush you have only just added nutes to the medium

if new growth is green its working the plant will right off badly damaged leafs

 

[Groff]

Agito, that is exactly what I was thinking! But so many contradicting opinions... Glad I didn't read your post or I might have ended up not doing all this today...

(I'm going to cross-post again to my infirmary thread, it will be the last time, so anyone following gets all the info.)

So what did I do today? 6 hours of intense labor.

- Calibrated pH/EC meters
- Cleaned out the res, filled it up. pH = 8.1 / EC = 0.335
- Measured how much pH (-) I needed to hit 5.8. Exactly 2ml/30L rounds to 5.5, EC the same (actually lowered to 0.315, but I guess chloride evaporates etc)
- Started flushing the medium, a little hard at first, then gently
- I let the airpots drain until slow drip. Put a tray beneath and went to roll a joint. Fired it up, chilled for 10m, go back and enough slow run-off water is collected to take a reading. pH 6.3 / EC 0.6
- I repeat the process 5x, with pH 5.5 flush water, run-off = 6.3 / 6.2 / 6.1 / 6.1 / 5.9 - > So thats 150L flush water, 30L per plant, 5 joints and calibration check here and there.
- So now that I am in the ballpark I prepped a last "flush", including a light feed. I could not let go of the feeling it is not nute burn. So I did a 1/2 strength dose from suggested Normal feeding by Canna. This rendered an even lesser feed than their recommended Light - here is the formulation



Now, I did do full dose Cannazyme and Rhizo. These two should never be a problem and in fact, quite beneficial in a situation like this. Cannazyme adds 0.1 EC, Rhizo 0.05.
I was quite surprised on how much 50% dose Canna A made the EC rise... about 0.5 !! Canna B at 50% rises another EC 0.2

So basically, I did an EC feed of 0.68 over base water. Slowly, circularly and steady until I heard run-off drippling. Let it sit a bit in the tub, then back into the tent.

- 15 minutes and a joint later, checked calibration (ok) and go read the run-off of the various trays... very surprising again. pH 5.8-5.9 and EC's between 0.4 and 0.6 - does this sound ok?
- I also raised the LED lights to about 70cm

So here are my conclusions;

- while Canna certainly does make top quality nutes and mediums, you have to take what they say with a huge grain of saturated salt.
I cannot find exactly where, but I know I saw/read that they advertise their Coco Pro+ as the most hassle free, ready to go, perfectly buffered etc.
I cannot imagine what the pH level was out of the bag. Shouldn't it be very close to 5.8? At the rate I fed previously and flushed, it would be above pH 7 - 7.5

For the sake of my sanity I hope so. If this reasoning is correct, do you think this could have been the problem?

 

[agito]

i got most of that on the next water check runoff and ec to see if there eating more or not and adjust from there
To be fair after the seedling stage things are easier
Maybe in the future start the seedling in a small bottomless cup with some light mix and coir or perlite just to get them passed that seedling stage i used to do this with dwc and it worked fine

If the ph is settled its a good sign

 

[Groff]

I hope its settled. do you think its plausible that somewhere over pH 7 cased such drastic effect?

 

[agito]

yes you need to be in the range of 5.8-6.3 in coir (slightly above straight hydro but lower than soil)
The only issue with coir is though you get rapid growth any issues happen rapidly as well

PH is very important in hydro and coir

 

[Kush T]

Phew!!... Makes me glad I went with DWC... Nice & simple

Hope that gets you sorted Groff... Agito is a real asset to this site.. Gonna have to slap him some rep...

 

[agito]

Coming from you kush it means a lot

 

[Groff]

f*ck me! really? you Canna

Yeah, just went back to check the pH/nute charts. Was still in mental soil mode I guess. I certainly knew it was on the upper side, but didn't know it would be so disastrous. I've been scrupulous to hit pH 5.8 since day 1



Anyway, had no idea the pH would be that high right out of the bag. At least they firmly advertise it as such. Any Canna Coco users out there had this pH issue, would this be a bad batch?

So looking at the chart, they've been lacking all the lower range. Could the browning on the first set mean they were feeding on the leafs to keep alive? They looks ugly, but its not like I've seen myself and read. The leafs are not crisp or hard, in fact quite the opposite, quite mushy

 

[agito]

thats not a coir chart it will be a touch higher than the hydro one

 

[Groff]

Hey agito!

I've never seen a coir chart! Is there one?

I know it say hydro, but I always assumed the variances between strains / nute line / meters would be greater than the slight adjustment from hydro to coco.
Everywhere and everyone seems to say is just like hydro, slightly higher pH in general, and different feeding regime (obviously). Hence the term cocoponics.
But everyone says 5.8 is the target with coco, and according to this chart it is the optimal nute intake zone.

Again, 5.8 over and over again mentioned in coco grow diaries.