Week 5 yellowing, N def or natural fade?

Running a Zkittlez auto, coco/perlite, mixing my own base salts at roughly 185 ppm N going into week 5 of flower. Bottom and lower-mid fan leaves are going yellow and dropping. pH is locked at 5.9, EC around 2.1. No obvious spots, no interveinal chlorosis, just a clean yellow-to-drop progression moving upward slowly. My instinct says this is the plant mobilizing N out of older tissue as it pushes into late flower, which is textbook. But week 5 feels a little early for me to be comfortable calling it a natural fade. I've seen true N deficiency move faster and hit newer growth eventually, this hasn't done that yet. For those with more runs logged, what's your read? Is clean upward-progressing yellow in week 5 more likely the plant doing its thing, or would you bump N a little and see if it stabilizes? Thinking about pushing my calcium nitrate fraction up slightly to add maybe 20-25 ppm N without throwing off the rest of the profile.

2 comments

2 Comments

Seedling11d ago

I’ve seen the same pattern with The Seed Pharm Zkittlez autos around this stage. They tend to start fading a bit earlier than some other lines once they hit mid to late flower.

Seedling10d ago

I’ve seen the same pattern with The Seed Pharm Zkittlez autos around this stage they often start fading a little earlier than some other strains once they hit mid flower.