I think it's a P deficiency, should I be worried?

jollyshaman

Member
Hey y'all, first post on rollitup! I've grown in the past, but really upgraded my system this time and I've never seen this before so I thought I'd reach out for some advice.

I'm growing a 2' x 2' x 4' tent with a Viparspectra p2000, vented with a thermostat/humidistat controller. I'm trying out Barney's Farm Wedding Cake and Purple Ayahuasca, and got the seedsman White Widow and Bruce Banger as freebies so I popped one of each. First time growing all of these so I'm learning what they like. Doing it in 1 gallon smart pots with a soil mix made of compost, coco coir, vermiculite and perlite. My soil mix was a little hot so we fought some nitrogen toxicity in the early stages, the Wedding Cake was the most effected and was majorly stunted. I'm going to mix it down with some peat moss for the next round. To keep them short I tried some manifold training and a little defoliation to let the light through to the lower bud sites. The plants are about 12.5" tall and 19" from the lights.

Room conditions are like this:
Daytime Temps - 78 F - 82 F
Nighttime Temps - 64 F - 70 F
Daytime Humidity - 46% - 55%
Nighttime Temps - 54% - 60%
Light Schedule - 12/12

Watering every 2 days
Feeding 1/4 cup of the following solution each watering:
1 Gallon Batch:
12 mL BioCanna Bio Flores
10 mL BioCanna BioBoost
5 mL Natural Cal-Mag
2 mL BioCanna BioRhizotonic
pH'd to 6.5 - 6.8

We're about 28 days into flowering now and I'm seeing some purpling on the leaves of all but the Wedding Cake. I think it's a P deficiency, but I'm not sure if it's nighttime temps or genetics playing a role. I've increased the feeding to 1/2 cup last week, then 3/4 yesterday after no changes.

The plants don't look too stressed, but I'm trying to get some monster colas and I'm worried this'll hurt my yield if it goes on too long or gets worse.

Some pics are under the LEDs, I took some more outside the lights under incandescents.

Under LEDS:


Wedding Cake:
1615139635225.png

White Widow:
1615139666757.png
1615139760354.png

Bruce Banger:
1615139692487.png

Purple Ayahuasca:
1615139723432.png1615139589266.png1615139635225.png1615139635554.png1615139666398.png1615139666757.png1615139692487.png1615139692128.png1615139723432.png1615139759996.png1615139760354.png1615139589266.png1615139635225.png1615139635554.png1615139666398.png1615139666757.png1615139692487.png1615139692128.png1615139723432.png1615139759996.png1615139760354.png
 

jollyshaman

Member
I had a hard time with the photo upload stuff, here are some pictures of the White Widow under incandescent for better color accuracy:
1615140081932.png
1615140097819.png
1615140111976.png

Thanks for taking a look! Any advice appreciated.
 
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