discoloration - cupping of some leafs

Chodee

Member
Hey everyone I am about 3 weeks into flowering.
I am having discoloring on both of my plants.
one of them has been really bad lately and seems to not be changing.
Ph I aim for 5.8-6.2 - coco coir - perlite

IMG_20160729_244410227.jpg (Plant 1)
This picture is from the healthier plant without the discoloration all over issue.
He just yesterday started getting these marks shortly after a water feeding.
I cut back on my nutes because I was seeing burnt tips.
If anyone has any tips for this one I would appreciate it.
For the most part this lady is healthy other than these new marks.



IMG_20160728_211700561.jpg (Plant 2)
This is the pic of the one I am more worried about because he hasnt seem to making any coloring changes.
I was thinking it was magnesium issue with this plant.
I added a little bit extra cal/mag like 1/2 extra tbs to water (GH)
Seemed like no differnce.

One big thing to note here and I am pretty sure all these issues happened during it.
Ph meter wasn't calibrated and my roomate used it to feed and i started noticing issues like next 2-3 days so I checked all runoff - ph'd it. The ph was really low reading like 5-5.2 (Runoff Value) but it has been a week now and ph is back up in range but I am not seeing any real color improvements. I just wanted to get on it before it gets out of hand.
This plant when I was checking runoff value seemed low for age of the plant?? like 500-550 ppm Don't know if this means anything. The other plant is in the 900-1k range on runoff value.

The cupping I was thinking was heat stress i had 2 nights where the room got to like 85 degrees and plants were like 15 inches from light. It was early transition testing new room - temps - ac.
What I don't get is the discoloration and continued cupping. Is there steps I need to take after a heat stress incident?
Using cheap lux meter (Staying like 75-80k on tops from light) - temps are at 67 degrees for nights and sometimes high of like 79 during light period.

Is there a possibility I am not giving enough nutrients? I held back my nutes yesterday because of how shitty - stressed it was looking.

If anyone has suggestions of what I can try-do I would appreciate it.

Thanks.
 

Bradders85

Active Member
Definitely a magnesium deficiency, but could be from incorrect PH.
Try spraying with some epsom salts or calmag, fix PH and give a light feed.
 

STLbudz

Well-Known Member
Epsom works good and your on the verge of not being able to foliar no more , could be ph something I'm fighting with my new medium (rockwool) looks like your pushing em a lil hard too so your probably locking out nutes . I'd follow Braders advice. Back off nutes a tad
 

BM9AGS

Well-Known Member
Slight tip burn so maybe a lock out. If you're following a nutrient lines feeding then I'd guess it's ph problem.
 
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