potassium

Hey just a quick question to do with nutes. Im a first time grower and have not used them before. Ive got 1x DieselxCritical Mass and 1 x CriticalxSkunk #1 Autoflowers in soil under 1x23w and 1 x20w 2700k CFLs. Pretty small grow, small space, small budget. My babies are in the the 2nd week of...