canna pk13/14 in soil ?

on my third proper grow,ak47 35 days flowering,using canna terra flores also picked up some pk13/14 and boost accelerator,on the pk bottle it says add pk once 3 weeks before harvest to a full nutrition tank in the following proportion dissolve 150ml concentrate per 100litre of water add this mixture to the tank for 3-6 days also says on the front for use in all media,anybody use this in a soil grow,if so how much and when?also using canna boost every watering any input welcome.

anyone?????

I emailed Canna about using PK13/14 in soil and they just said to use the same directions as for hydro which wasn't much help.
So I just watered my pots with it for 6 days.
Didn't see much for a couple of weeks but now at 9 weeks flowing they have burst out with more flowers.
Hope this helps.

thanks for the reply thats wat iam going to do