Nute burn or deffcieny

[Wreched75]

Hey guys so I am having an issue here, info below

strain: northern llights
media: coco
temps: 75-80
humidity: 45-50
nutes:GH 3part, liquid karma, hygrozyme, super thrive, bio roots, and cal mag
EC: 1.7 @ .5 calculation
Plant age: 7 weeks

 

[smailer]

It's so depend...
check your run-off parameters.
It's looks like potassium def. and Mg.
But it's can be cause not enough liquid amount due watering. and salt buildup in your medium lockout following elements

and It can be some signs of of offgassing - but it's so so rare case..

 

[Tidwell]

You are using cal mag ????

 

[Wreched75]

Thanks guys! My run off is .5 EC which is 100ppm @.5 calculation. And yes I am using cal mag. The PH though on run off is 7.2 but I water at 5.6-5.7 for swings. Would that be an issue? I think I am going to flush tonight with some florakleen to get rid of the salt build up what do you guys suggest? Thanks

 

[smailer]

hmm think logically
If you give 1.7EC and on runoff you get only 0.5EC.. this says what plant want's to eat
So pH change can be by some reasons. not so good flushed coco or plant eat some element's more than other what makes pH shift.
I'm not so experienced on coco. but try to flush with nutrients.

 

[RonSmooth]

Since it is happening at the lowest leaves only, you can eliminate a few things right away. Deficiencies in mobile nutrients show in lower leaves first. If I had to pick one, itd be Potassium. That would explain its stunted growth, that plant is very small for 7 weeks.

Youre feeding a relatively high EC. Deficiency due to lack of a nutrient seems odd. A lockout may be happening due to an excess of one element or environmental conditions.

 

[GSPfan]

What are your temps during lights out? Is the floor really cold? I've seen similar results from temp problems.

 

[Wreched75]

Since it is happening at the lowest leaves only, you can eliminate a few things right away. Deficiencies in mobile nutrients show in lower leaves first. If I had to pick one, itd be Potassium. That would explain its stunted growth, that plant is very small for 7 weeks.

Youre feeding a relatively high EC. Deficiency due to lack of a nutrient seems odd. A lockout may be happening due to an excess of one element or environmental conditions.

Hey Ron, well the reason for the plant being so small is that I just topped them on Sunday, I took them down to there 2 healthiest nodes removing all the growth below (which was not much) then watered on Monday with the fresh batch of nutes with the EC of 1.7 the only added new nute was liquid karma and hygrozyme.

 

[Wreched75]

What are your temps during lights out? Is the floor really cold? I've seen similar results from temp problems.

Lights out it's at 67-73 lights on 75-80