Above every acre of land on the planet is 35,000 tons on atmospheric nitrogen. Why buy expensive nitrogen fertilizer, most of which will end up in your local watershed? Every possible nutrient your plants need is currently in your soil....guaranteed. The trick is making those nutrients plant available.
Get your soil biology correct and let microbes take care of all of your nutrient cycling. Soil is alive and should be managed as such. Soil biology and plants have an established ~500 million year old symbiotic relationship. Let nature do nature.