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Potassium deficiency, or nutrient burn

Hi guys,

I'm three weeks into flower on my first grow. I've recently noticed some tip yellowing, and a few leaves that are curling upwards and have crispy edges. A few of them have yellow spotting on them. I've noticed the slight yellow tips have been there for quite awhile with no other negative effects until recently. my DE lights are dimmed to 50 percent at the moment and my room is 73-74 degrees. RH is 50. the lights are 2.5 feet above the canopy and using a lux meter it was reading 30K. So I think I can rule out light burn. My feeding schedule is Canna nutrients twice a day at 750ppm. ph 5.9-6.0. My runoff was 900-980ppm 5.9 ph. I was leaning towards a potassium deficiency from what I've been researching online, but I just don't know. I do have a springtail problem that I've tried using Dr zymes and Nuke em but they're still there. Ive read they can be good, I've read they can be bad. The problem is slowly spreading everyday I go in the room. Any help would be greatly appreciated.

Thanks
 

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maryjane481

Member
You have a problem with nutrient lockout. You need to increase the runoff by feeding four times a light cycle. Lower your E.C. to 1.0 and feed 4 times a day until the problem clears up.
As your plants grow larger it’s best to increase the feed frequency with lower EC levels.
 
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