Help! Autoflower day 21. Overdosed on calmag, ORANGE spots on lower/middle leaves 2 days later

kreikrei

kreikrei

Active Member
Hi!
I am a beginner grower. I topped the plant on day 20. Maybe thats why its a bit droopy.

Setup:
3x3x6 tent
3 gallon pots, Biobizz light mix+ biobizz nutes
RO water (and biobizz calmag)
Environment - 22-25celsius and 55% humidity, lights on 24/0. Ppfd/DLI in normal range for this stage. Also have a decent osciallting fan and 2 small pc fans.

Problem:
During my first big watering (day 19 and 2-2.5 liters of water for 3 gallon pot) I accidentally gave about 250ppm of CALMAG
Why? Because I didnt know PPM meter doesnt measure organic calmag correctly.
I thought I put in 50 ppm (RO + calmag), but the true number is closer to 250ppm of calmag.

1 day later first 2 leaves got orange spots
Now - 2 days have passed and 3-4 leaves have orange spots.


Is this PH lockout? Or a deficiency? Should I give nutes on next watering (today or tomorrow) or do the opposite and flush?

I havent given any nutes yet, I will water today/tomorrow.
The plant was given 80% RO and 20% tap water for the first 18 days, no nutes.
Only feeding was 2 days ago with 250ppm (Ro +calmag)

Thanks guys and happy growing!

@Nutty sKunK - you dont think its manganese again?:D The orange spots started 2 day after calmag overdose
 

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kreikrei

kreikrei

Active Member
hotrodharley said:
Likely phosphorus deficiency due to lockout from excess calcium. Why did you top an auto?
Click to expand...
The orange patches have stopped spreading, only 3 leaves affected. If they had continued spreading I would have done a flush.
Yesterday watered with 50 ppm water and 25% on vegetative nutes. (biobizz grow only).

I top autos, because they have come a long way from 10 years ago and topping provides better yield. Also, I prefer many smaller colas, since 1 big cola increases risk of mold and I dont have a dehumidifer
 
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