Pee Productivity
The scientists fertilized several groups of greenhouse tomato plants: one with human urine and birch ash, another with commercial mineral fertilizer, and another with just urine.
Plants fertilized with urine and ash yielded nearly four times more tomatoes than nonfertilized plants.
This compared favorably with commercial mineral fertilizers, which produced roughly five times as much fruit as nonfertilized plants.
To the team’s surprise, urine alone produced a slightly greater yield than those of urine and ash together. (Read about sustainable-agriculture projects around the world.)
But the urine-and-ash plants became larger than the other groups, and they bore tomatoes with significantly higher levels of the nutrient magnesium, which is key for bone, muscle, and heart health, among other biochemical functions.
A group of 20 taste testers ranked tomatoes grown by all methods as equally tasty.
http://news.nationalgeographic.com/news/2009/09/090918-urine-ash-fertilizer.html