KUKIDE: In 2007, Canadian physicist and agricultural consultant Patrick Déry studied phosphorus production statistics worldwide using Hubbert linearization analysis (a technique used to forecast oil depletion rates and concluded that the peak of phosphate production has been passed for both the United States (1988) and for the world as a whole (1989). Déry looked at data not only for phosphate that is currently commercially minable, but for reserves of rock phosphate of lower concentrations; he found - no surprise - that these would be more costly to exploit from economic, energetic, and environmental standpoints.
Richard Heinberg, The End of Growth, str. 135.
Richard Heinberg | The End of Growth
http://richardheinberg.com/bookshelf/the-end-of-growth-book
http://www.amazon.com/End-Growth-Adapting-Economic-Reality/dp/0865716951
Musim doplnit, ze fosfor je postupne odplavovan a konci v rekach a v oceanu. Umela hnojiva se nejspis opravdu v delsim horizontu nebudou moct vyrabet, kazdopadne pujde nahoru jejich cena a s ni cena potravin. Bez umelych hnojiv muzeme ocekavat pokles vynosu na hektar minimalne 2,5x, tzn. 2,5x mene potravy, ale spis vice, protoze puda je v katastrofalnim stavu a jeji obnova muze trvat staleti. ID KUATO nebo BROZKEFF by urcite k tomuto mohli rici sve zkusenosti jak obtizna a casove narocna je sanace pudy.