Prisoners shall be directed to clean up sewage at the Palace and government offices as well as toilets of the east and west on the morning after a rainy night (Collected Interpretations of the Administrative Laws Ryo-no-shuge) Selling human waste products as fertilizers became much less common after World War II, both for sanitary reasons and because of the proliferation of chemical fertilizers, and less than 1% is now used for fertilization. نو - شوغه) بعد الحرب العالمية الثانية، أصبح بيع منتجات النفايات البشرية كالأسمدة أقل شيوعا بكثير، وذلك لأسباب صحية وانتشار الأسمدة الكيماوية.