Thanks mscaboo and stinkyattic for your advice. I won't necessarily be able to get max possible yield out of this one plant but I've learned many valuable lessons for the next go, among them:

1) MG ferts- paint em green and give em to the rabbits
2) Extra N amendment at beginning flower
3) stabilize soil pH at beginning with dolomitic lime
4) easy on the superthrive
5) use Mylar
Next time around I'll be preparing my soil to better deal with long-term macronutrient and pH requirements. I started intensive research into nutrient needs AFTER starting this grow and I've been chasing my tail ever since.

Some of my lessons learned are positive...

1) my soil mix seemed to be good for veg. They vegged for only about 6 weeks and growth was good with decent internodal spacing.

2) I have room for 3- 3.5gal containers but opted to let just one plant(trained and tied) use that space. Next time I may veg 2 plants for 4-5 weeks and train them into the available space.

3) Apart from my Nitrogen and pH issues, I'm happy with the way this one plant responded to having its apical meristem(college botany flashback) trained down to the same height as the lateral stems. I did this at the beginning of flowering over a few days and the tops of the lateral stems responded very quickly to being "at the top of the plant". Now I have the main cola (far left of my original picture) plus 18 lateral stems that "think" they're king of the mountain.

SO.....I'm going to put the N def in my "lessons learned" folder and try to give the buds what they need (P&K) for the home stretch. Will fert today with full-strength AN Bloom and let it ride. They are day 39 flower today, almost finishing week 6 so I'm not going to dick with adding any more nitrogen to this girl. I will flush thoroughly in another 7-10 days then let soil dry out before harvest.

Thank you all for your input and advice.
SecretSquirrel Reviewed by SecretSquirrel on . Worry about Nitrogen in week 6 flower? Hi everybody! Here's what I got... 25% perlite 15% castings 60% MG Organic Choice garden soil (.1 - .05 - .1) ("slow available N") ...in a 3.5 gal container...about 20 inches from 400W hps...from 73-86 deg F w/daytime avg 82 deg...35-40% humidity... 24/0 veg and 12/12 flower. Constant fan above tops, pretty good air circulation. Used half-dose MG 30-10-10 beginning veg then half-dose MG 18-24-16 fert during late veg and half-dose Expert Gardener 10-52-10 for first 3 weeks of Rating: 5