Plant Moisture Stress - Symptoms and Solutions
I am not an organic purist. I also like slow release foods like Osmocote, their 10-10-10. I use a 18-5-9 with micros from start to finish. I blend in the complete encapsulated plant food, plant, water, and leave it alone until harvest. Doesn't answer your concern though. For blooming, I'd recommend the duty 1-3-2 like Jack's Blossom Booster or you can work in a couple of teaspoons of bone meal, in a typical commercial soil blend. I don't know what kind of NPK nutrient charge your mix started with or has now. That needs to be considered too before you start throwing stuff at it. It's a "sum of the parts" thingie. Contrary to popular forum thought and parroted paradigms, growing is NOT about the buds, at least it shouldn't be. Master gardening is about producing and maintaining the most amount of healthy foliage (and roots) until harvest. Think outside of the box on this one. And if you've been following the crap regurgitated in all cannabis growing sites, this concept is gonna be outside of your comfort zone, if you know what I mean. 90% of folks will eventually screw up their plants by the abuse of bloom foods, supplements and such. Keep the foliage green and healthy, that is your focus even if it requires you use a high N food like 30-10-10 during flowering. Don't worry about the buds, they'll be there when they're damn good and ready.
Again, the plant's branches are droopy which suggests insufficient moisture. When you have such nice thick, healthy foliage, it is next to impossible to over water. As quickly as you water the plant it's wicking off soil moisture via the roots as driven by leaf transpiration, capillary action, internal tissue water turgor (pressure). Such a nice condition provides for a lot of soil aeration automatically. It's just that easy.
FWIW, I've had plants like yours in a 3 gallon pot and they were using water so fast I had to water twice per day. Water until you get good runoff from the drain holes, don't be stingy. If the plants are in saucers (the kind with 2" tall sides) you can use a turkey baster to suck up the tea out of the saucer and then use the tea on indoor plants or your garden outdoors, etc.
Might wanna flip the switch real soon or you're gonna end up with a tree! That Mazaar looks pure indica and capable of producing huge rock solid colas much like my avatar, IF, you maintain the leaves in their current healthy condition until harvest. Just a thought, there's gonna be A LOT of phytochrome hormonal action with that Mazzar, such that you could probably feed it pure N like blood meal, ammonium nitrate, UAN, etc. and it wouldn't even faze the flowering response.