What def is this?

[Greentriangle]

Hey everybody
First time grow having a little trouble trying to diagnose this issue
Cheers and thanks for your help

Problem:chlorosis/necrosis+minor upward leaf curl & papery feel to leaf tissue

-Medium/grow method:80/20 coco to perlite(canna coco pro) hand feed to 20% runoff.

-Feed and supplements used:h&g cocos 1.25ml a&b per lt,cultiplex calmag 1.5ml per lt,seasol 0.5ml per lt hand watered every 2-3days at this point.
Last feed e.c 1.4 ph5.8

-Water source-tank-water ec 0.1

-Strain and age auto lemon og 22days old

-Climate:24-28*c night to day.60-70%rh
- Light used:led Mars 2 900w 18/6,24in from plant tops

 

[komplex180]

I believe you have a CalMag whore. Was the coco rinsed and presoaked in CalMag prior to sow?



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[Greentriangle]

Yea I was thinking calmag. I didn't rinse as canna advises against it,I did pre-charge the coco with a light feed of a&b and calmag

Should I up the calmag and drop the base nutrients? coz she is on the verge of nutrient burn if I up the ec anymore

Thanks for ur help komplex180

 

[komplex180]

Press the reset button GT(flush). Best part about coco is that you can always flush it.

Throw some CalMag in the flush water and PH to 5.8 should flush 3x the capacity of your pots. Continue to feed this for 2-3 days and see if it helps.

I had nute lockout just recently because I wasn’t PHing and the flush helped dramatically. I saw a difference the following day.


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[Greentriangle]

Thanks Kplx180 I'll follow your advise

 

[Waira]

-- yeah, looking like Ca defc. to me too,...maybe a little Mg as well,... could be the coco isn't fully sated for Ca/Mg yet, and so it's hogging it and keeping it unavailable to the roots,... just to be sure GT, are you hip to coco's odd CEC properties? As mentioned, it has huge affinity for Ca++ cations, Mg to a lesser extent,... Also, if you flush, use a specific solution for this, never water alone or it'll TARFU the CEC buffering in there,... RO/Di water, with Ca-Mg added to 150 ppm, then another 150ppm in nutes, pH'ed to 6.0,.. pour through until the run-off is at or near inputs,... BUt you may not need to, maybe just skip the nutes and use a straight full dose of Ca-Mg,... try that and see if progression halts,.. hopefully this will get the coco to saturation with Ca/Mg,...

 

[Greentriangle]

Thanks for your assistance waira ,so I did some reading up on Cec.i was thinking this auto was a fiend for the calmag but she is not. it's just been out of her reach this hole time.
So I have done the calmag flush,waiting game now I guess.
Thanks again