Grow bags outdoor, which soil/nutrients to use?

I am planting 40 pinewarps and 60 early wonder skunk autoflower outdoor in 10 gallon grow bags. I am just wondering what soil would be best to use. Can I just use promix-hp, or would there be a better choice? Also should I add any supplements into the soil?

The plants have been vegged indoor, in promix-hp, and are ready to go out, this is just my first attempt at outdoor and I'm trying to figure out the fertilizer and nutrient requirements.

Is it better to give food when I water , or should I have a slow release food in the soil?? Any help will be appreciated.

You do realize thats 1,000 gallons of soil right

Stride said:

You do realize thats 1,000 gallons of soil right

Click to expand...

I do realize that, the natural soil is too acidic and rocky so I have to haul all mine in. Any tips on what I should add to my promix-hp in the grow bags? I am mixing in some polymer crystals to hopefully reduce the amount of times I need to water. Should I add some guano or worm castings to my bags when I plant, what about grotek black pearl, has anyone ever used that in their soil mix?

ur gonna have alot of work on ur hands

try to look for a place that makes compost in your area its a cheap way out and only have to add very little to make it the way you want it. they should supply a chart as well with it. make your self a brewer and make up some teas when u see deficiencies. thats just my 2 cents

27x7=189
you would need 6 yards of compost

Hey shizizzle pro mix is okay I've never used it but the ferts seem decent, i'm an older grower with a bit of a new style tweak, so i always use cow shit in my soil( 7 years+ or the .5.5.5 from Walmart) no where near as much as some of the guys i know i do maybe 7-15% cow shit then normally asb green world garden and vegetable mix it's a wonderful light fert soil very easy to work with, and i keep a good ol bottle or big bud in reserve for july 29th ish to force flowering. I have no clue why people say cow shit is crap when you get proper shit it's wonderful just make sure you let it settle for at least a month before planting and have ample drainage (2inchs of crushed stone) at the bottom or your holes for a good flush near the end of the year.
I've done grows side by side with and without cow shit the only difference was about half a pound and 4-6ft, you keep your smell which is very important to me and if you have enough for drainage do a regular 2week flush and it's no different for taste also very important to me. Just don't go to your local farmer expecting to find top quality shit because you wont you'll get shit thats still like 20-5-2 because it's a never ending mixture of new shit. Either you dedicate a ton or half ton somewhere and treat it over the years your self or buy the .5 stuff