Here we go again curling leaves/brown spots

Indoor Growing Climate
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I’m about to call it quits on this strain. But my stubbornness won’t let me.
Strain; Type, GSC

Soil In Pots: ffof in 7 gal pot

System Type?

Ph Of Runoff Or Solution In Reservoir? Tap water, set out for 48hrs, pH7 in, 5.2 out Ppm 115 in 116 out

What Is Strength Of Nutrient Mix? 1/2 strength fox farm

Indoor yes

Light System, Size? Roleadro cob and Growstar 300 w UFO

Temps; 66-75f

Humidity; Day, Night. 56% -99%

Ventilation System; no

Ac, Humidifier, De-humidifier, no

Co2; No

8+ weeks into veg, flushed plant 2 weeks ago before putting it into scrog, no visible signs of stress.

3 days ago I did a lot of trimming under the canopy in preparation for the switch to flower. Yesterday was plain tap water. pH runoff was really low, @5.2 it’s been dropping every time I water/feed. Dolomite lime is on its way.

Humidity sees some big swings from an average of 60% during the day to 99% just before I reopen the tent.

Everything looked great yesterday, I was planning on switching to 12/12 today, but when I opened the tent I saw yellow, curling and brown spotted leaves.

Fwiw, there’s another plant in the scrog next to it and that one appears happy. It’s run off is @ pH 6

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I’ve removed all leaves that appeared to be affected.

Hopefully it’s a cal mag deficiency and not rust. The high humidity was bothering me, but the cloning tray enjoys it, and I had to keep the tent zipped up overnight.

There is a small circulating fan under the canopy.

I’m going to switch to 12/12 tomorrow and plan on leaving the tent open from now on.

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Looks like your ph out is too low. It should be between 6 and 7.0. 6.5-6.8 ideally. And your ppm should be higher. You should try watering at about 7.8 ph in with full strength nutes. But they look good

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@garrigan62 @Myfriendis410

The low ppm is probably because of the flush. I haven’t started on the flowering nutes yet. Just water the past 11 days.

I’ve been having problems with the ffof and ft trio causing low pH. It might be a result of my extended veg times, (3 months). I’m going to start adding dolomite lime.

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save this link

and for the win

– Darkening (dark green, blue, or gray) of the lower, older leaves
– Thickening and spot forming (bronze, purple, or brown in color) on lower leaves
– Yellowing of leaves where spots did not occur

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PH and feed don’t flush add dolamite lime Garden lime stir into surface of soil then mix your nutrients full strength adjust ph to 7.5 and water in. Confirm ph of run off has risen ad more lime if needed and adjust next feed ph accordingly

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