Main cola leafs are changing color

Does anyone know why my plant is changing colors on the main cola
 

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Whole plant pictures would help tremendously. So would knowing a bunch of other things:

- Medium
- Lights
- Temperature
- Humidity
- Nutrients in use
- Amount of nutrients being used
- pH of water and water/nutrient mix
- Ventilation setup
- Strain
 
They look hungry as hell ... it is pulling what slim amounts of nitrogen it can. Better come around and work on feed.
If fans and leaf lose all “ green “ function , photosynthesis drops off cliff.

Which can leave you with a plant unable to continue growth and you are left with unfinished / immature flowers at harvest.
Once all leaf has died or impacted , you are left with whatever they stopped at.
 
It's a soil medium mix with perlite
The light I am using is mars hydro ts600
The temperature is usually around 75 to 82
And humidity at around 50
It's a gg autoflower
 
Just asking as this is my first grow not sure what to do since I havent gave my plant nutrients in about over a week since my plant is 81 days and according to the seed it should have been 55 to 60 days and I know it's not always correct
 
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