Fertilizer
If 40 percent of the people in India stored their urine to use it on their crops, the country’s farmers could save $26.7 million (1.2 billion rupees) in fertilizer expenses, Sridevi Govindaraj calculated when she completed her doctoral thesis in ecological sanitation at the University of Agricultural Sciences in Bangalore. Incidentally, she may be the only person in India with a doctorate in ecological sanitation.
Our bodies make about four to eight cups (one to two liters) of urine per day, and it’s rich in nitrogen, potassium and phosphorus, the same elements that crops love. It’s also pretty cheap to make. Urine, Sridevi told E4C, is a useful resource.