Holding optimal levels in the soil and efficiently recycling nutrients long term is what should make you say…. “Dayum!”……Not throwing out a chit load with each planting. What I mean is…..I may have only added ¼ of that rate…..but if my K levels were already in the 180-240 lbs/ac range then I’m golden. I may not add any P because my soil levels are already 75 lbs/ac….. I’m still good to go…….I actually haven’t added any fertilizer other than some N…It's more about how well you can hold the nutrients and deliver it to the plant than how much your throw out of a spreader. There's no telling how much is just washing off into the ditch with a lot of plantings....