Curious what others think this might be... Some leaf browning

[cc014572]

So, just when you think you’re getting the hang of it, a plant throws a curve ball. Not overly concerned since I think she will grow out of it, but more curious for what it is.

Only change here is I used a new brand of Coco/perlite (Fox Farms “Cream of the Crop”). Although buffered, I did re-buffer with PH balanced water & cal-mag to get rid of some of the “coco sludge” as this brand had a lot.

Also, I don’t PH runoff per cocoforcannabis.com , but included below. Not sure if this is a mistake or not. Pics at bottom.

-What strain, Seed bank, or bag seed (photo or auto)
420 fast buds “Orange President (might be the reason, lol)” - Auto

-Age of plant
16 days

-Method: Soil w/salt, Organic soil, Hydroponics, Aquaponics, KNF
coco/perlite(50/50) w/high frequency fertigation to 10-15% runoff 3 times daily

-Vessels: Type and capacity of container (fabric, plastic, etc)
3 gallon air pots

-PH and TDS of Water, Solution, runoff (if Applicable)
IN: PH 5.9 in res. OUT: 4.7 – RO water

-PPM/TDS or EC of nutrient solution if applicable
EC in: 1020 (GH Flora Trio + Humic acid + cal-mag early growth light feed per feed chart.
EC Out: 1190

-Method used to measure PH and TDS
Separate TDS/PH meters. Just re-calibrated PH meter.

-Indoor or Outdoor if indoor, size of grow space
Indoor 2x2 tent

-Light system List brand and wattage/spectrum
AC Infinity Ionboard S22 100W (yeah, not the best, a kit light)

-Actual wattage draw of lights

-Current Light Schedule
20/4 750PPFD

-Temps; Day, Night
79 / 71

-Humidity; Day, Night
~ 60 / 65

-Ventilation system; Yes, No, Size
4" system

-AC, Humidifier, De-humidifier,
Humidifier currently

-Co2; Yes, No
No.

[MidwestGuy]

Don’t worry about the lower leaves. The plant will eventually shed them.

[OGIncognito]

Blemishes or from resting on wet medium. The new growth looks good as well as the routine you posted above in the ticket

[cc014572]

Thanks @MidwestGuy and @OGIncognito .

Not overly worried at the moment. But this leads me to another question - Should we need to try to PH adjust coco prior to grow?

So for a few grows I was using a product called “Cloud Coir”, that was working fantastic.
That went out of stock so I tried FoxFarm “Cream of the Crop 50/50” and used it on my first AutoPot grow and this grow. Both products are supposedly pre-buffered and ready to use, although I do rinse in cal-mag water to de-sludge.

So for kicks here, I made slurry of both in RO water and PH tested.
Cloud Coir = 6.5
FoxFarm = 4.4

So my first autopot grow was a semi-disaster( used the FoxFarm). One plant did great, the other appeared to have a immobile nutrient issue from he||. I’m wondering if this initial low PH could have contributed to that.