Human excreta is rich in soil nutrients. In a year, one person craps 4.56 kg of nitrogen (n), 0.55 kg phosphorus (p) and 1.28 kg potassium (k) enough to rejuvenate a 200-400 sq m patch. A billion can produce six million tonnes of NPK, one-third the total fertilizer usage in India.
The morning after
by , Down To Earth Magazine, 01 January, 2009