How will a NPK 15-0-15 fertilizer affect this soil?

If the soil we have has pH 7,2 and we want to add this fertilizer which has 15-0-15 (NPK). What should the fertilizer contain in order for the pH to get reduced?


I believe that $\ce{K+}$ ions should derive from $\ce{KCl}$ because it won't affect the pH.If it comes from $\ce{K2SO4}$, the soil will be more alkaline.
I'm confused about the nitrogen. Should it come from urea or NH4NO3? I believe that if the ions come from urea it will be more alkaline. Or should it come from $\ce{(NH4)2SO4}$?


