Growing numbers of farmers in Nepal are using human waste on crops . It 's a free and efficient way to increase production and yield and for higher price . `` So this produces some four kilograms of nitrogen , which is equivalent to eight kilograms of nitrogen-rich urea . '' Special toilets separate the urine and blood and with this they 're used on crops .
Growing numbers of farmers in Nepal are using human waste on crops . It 's a free and efficient way to increase production and yield and for higher price . Special toilets separate the urine and blood and with this they 're used on crops .