Is this a sulfur deficiency?

Falkornn

Member
Here are a couple pictures of a Northern Lights plant that is in week 5 of flower. Slowly the leaves at the bud sites on the tops of the plant(s) have turned light green.

Medium: Sunshine #4
Nutrient line: Cyco Platinum Series
Lights: Flowering under 4 x 1000 HPS 18" above the canopy
Temp: Low 70's at night. Up to 85 during the day.
CO2: Can't measure PPM. Room is 810 cubic feet, regulator is set at 15. It runs 30 seconds every 30 minutes.
Ph: 5.8 is the ph of the water when I feed.

Any help would be appreciated!
 

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