Light or heat damage or something else?

Cwmoore577

Well-Known Member
To give an overview of my setup..
Zkittlez auto in Royal Gold Tupur mix (coco) in 2 gal smart pot.
DIY tent that’s 5’ long, 6’ tall and 2’ deep. Temps run 70-75°F and 45-55%RH.
Two lights in the tent, one 100w output blurple full spec led and I put a SunSystem HPS 150 in about half way through this grow.


I’ve had a calcium issue with this plant but nothing maybe, only rust spots on the leaves as well as a bit of heat damage since I put the HPS 150 in there as it does run hot.

It’s gotten way worse in the last two days with the upper leaf edges browning and curling up more as well as the spotting on the upper and middle leaves worsening.

For the majority of the grow I’ve used the General Organics BioThrive line and Emerald Harvest Calmag.
I water between 2 and 3 times a day at 5.9pH, usually and EC of 1.0 or 1000 on my meter and around 700-800ppm.

However the last two days I ran out of the BioThrive line. So I’ve watered with the General Hydroponics FloraSeries line at the feed chart recommendations of 4ml FloraMicro, 8ml FloraBloom, and 2ml Liquid KoolBloom. Also adding the 5ml of the emerald harvest calmag.
Both at 5.95pH, 1100 EC and 800 tds.

My runoff measurements today were 6.03pH, 1.2 EC or 1220 on my meter and 870ppm.


It looks like heat damage to me although I’d like to make sure that the nutrient line switch wouldn’t harm the plant, especially this close to harvest. There was some heat stress but the browning/black edges have gotten significantly worse the last few days.

I’ve tied down the branches as much as possible without them breaking as well and raised the light as far as it will go.

The upper leaves look like this..
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Most lower leaves still look alright..
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I’m no expert by any stretch of the imagination, but if you’re watering two or three times a day with all those nutrients you’re probably burning those babies up.
Someone mentioned this on another forum as well. Tonight I watered and dropped the ppm to around 400 instead.
Still looks dank to me good job nice resin production.:goodjob:
Thanks. This is my 2nd go around first being bag seed that turned out shitty. Crazy difference good genetics makes.
 
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