I submitted a soil sample to the University of Minnesota soil testing lab and received a recommendation for applying at a N-P-K rate of 2-1-3 (attached) for my flower garden. The closest formulation I could find was this: https://www.missionfertilizer.com/products/mission-bloom-3-1-5-liquid-quart but I would need 10 bottles for my ~300sq ft garden area, which is not very efficient/economical. Is there an alternative approach I could use- for instance using separate N, P, K fertilizers (e.g., urea)? If so, how do I calculate how much I need to apply? Thanks!