12. You name it organo-mineral fertilizers?

Professionals know it well : under the same  fertilizer standard labelling NF U42-001 organo-mineral, two opposite products can be found  from an agronomic viewpoint: organomineral fertilizers pellets containing over 50% of plant compost and organo mineral micro- ball granules  containing 10% animal organic base of leather meal type ( supplying a minimal 1% organic nitrogen).