I've read posts from lots of growers over the years who have successfully used GH 3 part in soil. Here's a PDF attachment you should be able to download with a feeding schedule... Personally I'd go with half strength until you see if the new growth has any burn and if now slowly ramp up the strength from there...
For more info Google 'gh 3 part soil' and you'll get lots of threads to investigate...
Yah... not to mention you and a few million or so succesful dank grows with GH 3 part... Maybe THE most time tested nutes out there for mj... nice!:hubba:
I've been using GH 3 part on a grow I'm getting ready for final chop.
No problems with nutes.
Like Dirtyolsouth says, go half-strength to start.
And don't start too early.
the 3 part is god....i asked the guy at my local hydro store the other day what is the best nute i could use and he pointed to what i had at the counter and said "the 3 part you have there is the best i can think of"...this was a big store with lots of different brands...