urine

Urine is collected from this public bathroom in Cuernavaca, Mexico. (photo from Sarar Transformacion)

Urine is collected from the public restroom from a sports field in Cuernavaca, Mexico. (photo from Sarar Transformacion)

Three urinals collect urine from a public bathroom at a sports field in Cuernavaca, Mexico. (Image from Sarar Transpormation)

Urine is diluted with 3 parts water and used to fertilize corn. Because the urine is collected from the public,
it is stored for several months before being used to ensure die-off of any potential pathogens.
(image from Tepoz-Eco Tepotzlan, Mexico)

Urine is separated from this double vault "dry" toilet and collected to be used as fertilizer.

Corn grown on the right was fertilized with urine, a high quality nitrogen fertilizer.
The corn grown on the left was not. (photo by Peter Morgan of Aquamor, Zimbabwe)

Corn grown with urine fertilizer is much larger than the other corn. Urine is a valuable nitrogen based fertilizer.  (photo by Peter Morgan, Aquamor, Zimbabwe).