You are quite right about phosphorus!
You can look at the body/eart crust composition at http://www.etn.lu.se/~folke_g/recirk/Eng/elemdgr.html There, you can also see that the amount in air is negligible. Of course, if there is at lot of dust in the air, there can be some. The best way to avoid phosphorus losses is to get the urine bak to the land, both from people and animals. Look at http://www.etn.lu.se/~folke_g/recirk/sv/urin.html for the concentration. One person has a turnover of about 0.7 kg phosphorus per year. For a perfect circulation see: http://www.etn.lu.se/~folke_g/recirk/Eng/balanced.html Your
"David I." wrote: I remember being told in my Biodynamic Farming training that snow [even before airborne pollution] contributes significant amounts of Phosphors. I wonder how it gets there in the first place, I suppose from the 100 or so tons/day of space material that enters earth's atmosphere. Phosphors was the most difficult macro nutrient to retain on the farm in a 'closed system' and is the one in shortest world wide supply. --
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