This doesn’t work for everyone, especially those who love to turn dirt in plots like they are row cropping, but there are ways to cut a fertilizer budget that don’t really impact your plot success in many circumstances. Test your soil and see what it’s deficient in(and know that there is way more phosphorus present than most labs test for). So many plotters just use their same recipe of however many sacks of seed and X number of triple whatever. Get your pH right or closer to it. Lime is cheap and you should be doing that now or soon. It will maximize the availability of what’s already present. Adopt practices that allow you to build soil rather than dirt. Solid biological action and organic matter will greatly increase the holding capacity of a given parcel of land and slow the loss of most nutrients through leaching, erosion, etc.