ok yall, i beg your patience with me but once again i call on your help. My ph meter is tellin me my soil (50% potting mix-25%peat humus_25%perlite) is around 5.0, and the lower i get into the pot (8 inch pots), the lower my PH drops (all the way down to 3.5, peged out my meter), can i use bakeing soda to correct this problem and if so how much/ how often. please any help would be great