Timing Nutrients..N,p,k

when does MJ need the three nutrients nitrogen, phosphate, and potassium. im gorrilla growing and dont wanna spend money on the AN heavy harvest. just gonna get some cheap time release at the local Home depot or lowes

nevermind went back and watched ready set grow
n-veg
p-bud
k-all da time

also is heavy harvest organic or what its in the hydro section of AN website