Sure.
Very quickly, the 4R process is this: done at the right rate, at the right time, at the right placement and with the right type of fertilizer. I think it is a set of different practices that is attempting to use the inorganic fertilizers in the most efficient possible way. Independently, each of these different points—rate, etc.—is something that's scientifically—academics, our own scientists within Agriculture and Agri-Food Canada.... It's research that has been going on for many years and is now packaged by, as my colleague said, Fertilizer Canada to advance it as a package. It is a group of different principles that farmers should be applying to make good use of fertilizers.