清洁蔬菜是指不用粪肥光用化肥栽培的蔬菜。第二次世界大战日本战败后,占领日本的美国士兵,见日本人用人粪当肥料种菜,大为惊讶,于是自己种“清洁蔬菜”来满足需要。这种蔬菜采用水耕法,往混凝土的池子里放上水,将 Cleaning vegetables refers to the use of manure not fertilizers grown vegetables. After the Second World War Japan defeat, the Japanese soldiers occupied Japan and saw the Japanese using manure to grow vegetables as a fertilizer. They were greatly surprised by the fact that they planted themselves as “clean vegetables” to meet their needs. The vegetables are hydroponic, and water is poured into concrete ponds