The science is all there if you're willing to read papers about legal crops. Not very exciting stuff, but if you understand the reason a concept works, you can apply that knowledge to alot of situations. There's definitely an advantage from the extra minerals being used by the plants for reasons science doesn't fully grasp atm, as well as the added buffering capacity that can be used to create a nice slow steady swing in ph, allowing for optimial uptake of all nutrients.