An
interesting post on the shrinking reserves of mined
phosphorous at
Infranetlab. If you've never thought of where that P in your N-P-K fertilizer was coming from, think now. Go over to the site and check out the photos of strip mines. As for us gardeners who aren't wholly dependent on a high output of vegetables, we can continue to use bone meal, or possibly use pee for our P (the element was
discovered in urine).