As in several parts of the world, the use of "night soil" to fertilise crops was once common in Japan. However, the advent of sewage systems and treatment facilities, as well as chemical fertilisers, saw it fall out of fashion. About a decade ago, Japanese treatment facilities wondered if they could revive interest to avoid sewage sludge disposal -- a costly and potentially environmentally damaging process. But enthusiasm was limited until Russia's invasion of Ukraine sent the cost of chemical fertilisers soaring. That has been a bonanza for a facility in northern Japan's Tome, where sales of shimogoe were up...
