PLEASE ADVISE ON FEMALE PLANTS!!! im new at this

I got my hands on some female seeds and started growin these 2 plants on my outside balcony... The plants are in soil... I have been using a hydroponic solution called green air products Genesis solution it has a MICROBASE N 1% P4% and a BLOOM FORMULA N2% P5.7% k6% I am not sure if this is good enough but i have been using a small spoon of each per gallon of water and this is given to the plants once a week.. I water once every 3 days... so far the plants look good but im not sure if i could be doing more... If anyone out there has any advice based on the small buds in the photo please help.... I have no clue how much longer the flowering will take...

It seems like every other day I have atleast 5 leaves turning yellow with small brown spots... anyone know what that is??? otherwise the plants to me seem healthy and happy... any advice is greatly appreciated... thank you everyone!!!

When to harvest, use a microscope (30 - 100x zoom) and the picture below, yellow leafs and brown spots?that could be a lot of things, im guessin Ph problem, and mybe nut burn. Flush em with regular water, ph 6.0 - 6.5, 2x site of the pot.

the spots is most probilly nute burn, especially if you are just guessing the doses you give them, you should flush the pot and chill on the nutes for a few days or so and see if you notice a diffence. and as for flowering the best way is useing a microscope like the dude above posted, but another way to tell if you can`t get a scope is harvest them when roughly 3/4th of the pistils(hairs) on the plant turn orange, this should be anywhere between a month to 2 1/2 months from start of flowering

Thanx you guys for all the advice.... Can anyone tell by the photo if these plants are indica or sativa??????? I have no clue what i am doing and i think it shows...