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Sweet potato chips without pesticide and fertilizers.It is a kind of green food and very nutritious.Sweet potato is an annual plant,native to Central and South America,which can be planted in many areas on earth,it is widely planted in Junan area,which consist of 70% of all the planted areas in the world.It is one of the main corps in Southeast Shandong province,China. Sweet potato is grown in the soil without pesticide and fertilizers.It is a kind of green food and very nutritious,with content of sugar 256g,calcium 156 milligrams,phosphorus 374 milligrams per kilo and full of vitamins.It is also rich in carbtene.It ranks at the top among the 20 anti-cancer foods,as studied by the Centre for Cancer Research in Japan.Sweet potato chips,which is cut into peaces and dried with sweet potato,can be served as food as well as feedstuffs.