Plant need some food or let her go!?

So today is the 45th day for this little girl but I am just getting nervous and trying to be thorough before making any changes and I am just curious about what feedback I can get on the condition of how my plant looks and I plan on staying in veggie state for about another 10-15 days and haven't been using any nutrients only organic and I am also going through my first grow so be nice. And it's in soil and haven't added any other type of lights than 3 40w U-shaped fluorescent tubes and there're old T12s but I got new 6500K full spectrum and I have a old phototron for a grow box in an unused shower so I am on a budget

the lower leaves will yellow up when it needs food, its a good way to find out how good your soil is and how long you can leave it b 4 feedings. thats what ive just done with my auto to test out my potting compost, it lasted 4 weeks, next time i will feed it at the 3 1/2 weeks and just give it quater strength nutes , ive read that autos are sensative to over feeding, so a few yellow leaves o can live with.
others with more experiance with growing autos will chime in with other advice for you.
but its allways good to know your soils for future refrence