As
@TheSadVeryBadMadGrower mentioned your watering methods need improving. The pot should be saturated well each time you water then allowed to dry right down before watering again. I figure out how much each different size pot I use takes when going from dry to soaked. Makes it easier to mix up the right amount of nutes in bulk for many pots or tailored to a single plant.
I see you are using 3-part nutes but in the totally wrong ratio for a flowering plant. I've used AN 3-part for going on 20 years now. Used other's too but AN with pH Perfect makes life easier not having to worry about pH.
Most refer to 3-part nutes as GMB, Grow, Micro and Bloom. Ratio refers to how much of each you use in relation to another. As in a 1:1:1 ratio is equal amounts of each Could be 1ml of each or 20mls of each. Still the same 1:1:1 ratio. This is good for starting plants off with and gives them some of everything.
As the plants begin rapid growth they need lots of N and less of others like P and K so changing the ratio to 3:3:2 or 3:2:1 reduces P and K some while increasing N and micronutrients.
When it's a week before I flip to flower I like to give them a good feed at 1:1:1 with a half dose of Big Bud or P/K to 'prime the pump' to get earlier bud sites and flower set. The first 3 weeks during the 'stretch' is a period of rapid growth where more food, light and CO2 can really make a difference to yields.
After the stretch the demand for both N and P drop while the need for K rises. Switching to a ratio as used by the Lucas Formula reduces
Now that's how I deal with photoperiod plants but you are growing an autoflowering plant so there are some differences.
A 1:1:1: ratio would be fine until the plant begins flowering and for the first 3 weeks or so then either add some bud booster to the mix or tilt it toward the bloom side using a 1:2:3 ratio. Autos keep growing in size as their buds and colas form where after the stretch for photos the only size increase is from colas stacking up. Too much N in later flowering inhibits bud growth so when cutting back on N watch for older fan leaves beginning to yellow and increase N slightly the next watering or just add a bit of Grow or Micro if you just planned to water only. Near the end they may go yellow no matter how much N you put in so don't. N is a mobile nutrient so the plant can steal what it needs from it's leaves unless you're one of these defoliator types so there's no leaves to act as backups.
After all that you deserve a reward.
I found a great spot to download
FREE POT BOOKS. I downloaded a grow bible first and got lots more. Books look great and complete like the real ones I have here. No web site but just a page of links. Just right click on what you want and then "Save Link As" to download so they don't open first as many are 50+ megs. They got lots. Enjoy.
