Bumwhush
Member
Howdy all. This is my first time growing indoors and I'm having an issue with my leaf tips turning yellow, curling up and brown/rust-like spots on the tips. From my research, it appears to be possibly be a cal/mag deficiency and I'm wanting to get advice as to the correct diagnosis. Here is my setup and info:
Strain: Kilimanjaro (pure landrace sativa), growing from feminized seeds
Day : 24 (Vegetative stage
System: hydroponic ebb & flow setup, growing in hydroton
Lights: 400w MH at 18" from the tops of the plants, running 24hrs.
Temps: range from 77 to 81
Humidity: ranges from 40-55%
Nutrients: General Organics BioThrive, CalMag, BioRoot, Bioweed (This is day 10 of using nutes, they are still at 50% of recommended amounts)
Water: using spring water, feeding every 12 hours.
Ph: between 5.8 to 5.95
I added 25 ml of CalMag to my reservoir yesterday, which was at a little over 6 gallons left of water. I do not have a ppm/ec meter at this time, but will purchase one soon. Am I correct on the diagnosis and should I make anymore adjustments or wait to see what adding the extra CalMag?
First pic is of my setup.
Second pic is from plant 1 (with minor yellowing/brown spots).
Third pic is plant 2 (with lots of yellowing/brown spots on bottom leaves and starting to appear on top of leaves).
Fourth pic is a close up on the under leaves on plant 2).

Strain: Kilimanjaro (pure landrace sativa), growing from feminized seeds
Day : 24 (Vegetative stage
System: hydroponic ebb & flow setup, growing in hydroton
Lights: 400w MH at 18" from the tops of the plants, running 24hrs.
Temps: range from 77 to 81
Humidity: ranges from 40-55%
Nutrients: General Organics BioThrive, CalMag, BioRoot, Bioweed (This is day 10 of using nutes, they are still at 50% of recommended amounts)
Water: using spring water, feeding every 12 hours.
Ph: between 5.8 to 5.95
I added 25 ml of CalMag to my reservoir yesterday, which was at a little over 6 gallons left of water. I do not have a ppm/ec meter at this time, but will purchase one soon. Am I correct on the diagnosis and should I make anymore adjustments or wait to see what adding the extra CalMag?
First pic is of my setup.
Second pic is from plant 1 (with minor yellowing/brown spots).
Third pic is plant 2 (with lots of yellowing/brown spots on bottom leaves and starting to appear on top of leaves).
Fourth pic is a close up on the under leaves on plant 2).



