Closing the Food Nutrient Cycle

The Food Nutrient Cycle

Each year a person produces nearly enough fertilizer to grow one year’s worth of food.

EAT
  • Plants grow by absorbing nutrients from the soil.
  • Humans eat the plants and, in turn, also absorb the nutrients.
Urinate URINATE
  • Human urine and feces pass along most of these nutrients.
  • The average human produces 8 pounds of nitrogen and 1 pound of phosphorus in their urine each year.
Sanitize SANITIZE
  • Human urine is nearly sterile in healthy individuals.
  • As a precaution, urine is sanitized by pasteurization or long-term storage.
Fertilize FERTILIZE
  • Urine is a powerful and renewable fertilizer.
  • Farming depletes nitrogen, phosphorus and potassium in the soil.
  • These are the most prevalent nutrients in human urine.
  • Source-separated urine is storable, transportable and local.
  • Where there are humans, there is an abundant source of fertilizer.
Grow GROW
  • Nitrogen, phosphorus and potassium produce healthy, nutritious plants.