New grower need help diagnosing

[Rdub]

Hi guys and gals. New grower here. Hoping somebody can help me diagnose what’s going on with my plants. 4 train wrecks grown under a California LightWorks 1100. Temps are between 70-80 rh is about 50%. Using the autopot xl and general hydroponics flora trio with some of the supplements. Ppm of nutrient solution is 400 and I keep ph at 5.9-6.0.

 

[Rdub]

Oh forgot to mention plants are grown in coco/perlite.

 

[Rdub]

And I noticed the copy paste info so here it is

Problem: yellowing of leaves brown necrotic spots forming

Medium/grow method: coco/perlite in AutoPots with airdomes

Feed: and supplements used:GH flora aeries w/ supplements

water source: ro water

Strain/age: train wreck / 60 days

light used:California LightWorks solarstorm 1100

Climate: daytime temps ~80 F night time temps ~70 F. Daytime rh 45-50. Night time rh 60 at lights off coming down to about 50 as my dehumidifier starts working

Additional info: problem has been going on for awhile and was diagnosed as nutrient burn some time ago by members on another forum hence the low ppm feed at 400 ppm that’s including my cal/mag

 

[Beerhunter CDN]

If they appear to be yellowing all over on a low concentration feed then they could just be underfed now. Nute burn often starts with browning of the leaf tips. With Autopots there is no runoff so if they were over fed then you just feed weaker nutes for awhile, I would think. If you’ve been at it for awhile with weak nutes then you can start bumping them up a bit. I have not used Autopots before so a I don’t really know for sure how it works after over feeding or having a lockout.

 

[Heavily Medicated]

I think it is a magnesium deficiency, especially running in the coco. 400 seems a little light side at your stage. I would bump up to about 500 ppm and add extra Ca/Mg. If things color up with the 500, work up to 600.

 

[Rdub]

Thanks for the response guys I was thinking a magnesium or potassium deficiency. Will try bumping up a bit and going with the recommended dosage for cal mag

 

[Waira]

:smoking: yup, 400 is low especially if that's including your Ca-Mg base ppm,... symptoms are early, can't quite tell what it is, closer pics will help,.... What's the base ppm with Ca-Mg alone? My coco guru runs 600-800 at this stage.....