Researchers and science communicators describe how human urine could be reused as a source of plant nutrients. After the body absorbs nutrients from food, much of the remainder is excreted in urine. An adult typically produces about 500 liters (around 132 gallons) per year, and urine contains significant amounts of nitrogen, phosphorus, and potassium—three key nutrients plants need.
The Conversation frames the idea in terms of practical need and economic context, asking whether urine should be used as synthetic fertilizer prices rise. Phys.org focuses on the established value of urine as a nutrient-rich resource and presents it as a potentially “gold” alternative. While both sources discuss urine’s nutrient content and historical use, their emphasis differs: one foregrounds affordability and potential adoption, while the other highlights the underlying composition and potential utility of the material.
