From the perspective of the market requirements and the sustainability requirements, the source is important only in how it's used. For example, for manure, there is more of an emphasis on storage because it just doesn't appear overnight or get used overnight, so there's a storage period. However, the principles are the same. You use the right product, in the right amount, at the right time, and in the right place, which are actually the four Rs that Fertilizer Canada is promoting. That's exactly what they want. The issue with fertilizers, other than the incidental potential contamination while it's being stored, is that it be utilized by the crop and not be available for runoff into water.
On November 7th, 2017. See this statement in context.