you can use Earth Juice Meta-K (0-0-7)for k booster, liquid bonemeal(0-12-0) for p booster . Also Root Organics has H-P-K(0-5-4). Ive been using these, comparing them to FoxFarm OpenSesame.BeastieBloomz,& Cha-Ching. I think once i get the right combination, I wont need the foxfarm additives any more. I use these with EarthJuice 3 part.