Rose, I'm just looking to solve the shortage of natural phosphates that is expected to occur in the coming decades. However, I wonder if that is a fear campaign by AgChem manufacturers. If I really think about it, as long as we are in a symbiotic relationship (stewardship) with nature, our future will be okay. Their business angle is that they are being "green" in reclaiming phosphorus from our urine that is being collected by the municipally-mandated flushing of nitrogen into largely toxic pools. As we know all too well, the system design is flawed, but they are manufacturing pellets containing phosphorus, nitrogen, and magnesium that is a delayed release into the soil, mimicking nature.
Each of the elements have their cycles (carbon, nitrogen, phosphorus, potassium), and each plant nutrient has its own (ammonia, nitrate, nitrite, carbon dioxide, oxygen, salts, etc.), and each plant utilizes them in their own proper cycle (yes, biodynamics is relevant), and we have the cerebral capacity to work within nature's framework.
Rose, as for its consideration in permaculture, this product was brought up in one of our ecovillage discussions and I want to give it some room to breathe. Maybe it will develop a good track record for remediating urban waste streams, maybe not. But because it is already in production, why not make use of a product that is already available -- so consider it another waste product from urban environments -- to amend soils. A short term soil boost, perhaps.
Dale, it seems that mostly everything in Vancouver that they call "green" is actually greenwashing. Almost every new green initiative that I read about causes me to wince, grimace, or sneer. So many resources being poured into fruitless projects because they are so "chic" or "cool" ... what can you expect from a young and soul-less city like Vancouver, ever grasping for the latest trend, handbag, fashion, or vehicle?