i can not ID the soil u are using ...............hit us with the specs u went
most likey right on the overwatering .........stick to 2 cups only every 36 to 48 hours regural drain pots and every 24 to 36 hours air pots week 3 get yourself a spray bottle from walmart (they have flu oz on the side 2 cups is 8 fl oz .....so increase it some it depends on the pot type and soil mix)...........u can start the nurts now at a low dose talk 1/4......as u get to the end of the whole thing u will be using about 3/4 str of what ever grow/flower nurt brand plan u use .......autos do not like full power it burns them
if the yellowing keeps going after u dry check the ph of soil and or add grow at 1/8 and see if it is lack of N
head to the store and grab 4 gallons of distilled water ( ph 6 ppm 0 ) flush the soil with that it will lower it near the end of the flushing gather up some of the bleed off water and test that ph it should give u a close reading to the soils new lvl ....but has to be near the end of the flush not if u are dumping anouther 2 gallons tho