RE: Which Fertilizer?
30-120-40.....Rob:
100 pounds of 0-0-60 has 60 pounds of K
100 pounds of 0-46-0 has 46 pounds of P
Nitrogen fertilizers vary based on the source of the N...example Ammonium Nitrate is lower % N than Urea.
A fertilizer dealer will mix/blend the materials so that you get the right balance based on your order. To try to do your plot in a bagged pre determined mix like 12-12-12 is impossible and maintain the right balance.