Honestly, i know I make a few nutrients, and they sound complicated, but they are grounded in biology and the natural biogeochemical cycling of Carbon, Hydrogen, Nitrogen Oxygen, Phosphorous and Sulphur. So I give you some plant NPK etc ready day dot, but I give you the tools to access that in your natural system, those things tied up by time and sometimes human activity, eg dam building :-) or over feeding.
We dont manufacture N from a lab or by using artificial routes to break the inert N2, all the N or the P or the K etc, are all sourced from natural positions, materials, plant, animal, mineral and then naturally processed by natures own barstaff and chefs. We are not adding to a system we know is already fixed.
I dont know where other people source the NPK in the bottles they sell, but if it created, or excess to that fixed by the rules of god and planet, then it will come back to haunt us. We cant add socks if the draw is already full, the bay of Mexico is the place our efforts end up. Its time we took the lead as growers and took the options that mitigate our children calling us out when the shit hits the fan.
might not be our garden, but it might be someone elses and we might be the root
https://www.scientificamerican.com/article/fertilizer-runoff-overwhelms-streams/