Đại cương cây khoai lang
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Khoai lang( Ipomoea batatas) là loại cây lương thực được trồng từ lâu đời. tuy nhiên về nguồn gốc, người ta vẫn chưa biết rõ ràng và đưa ra hai giải thuyết..
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Nội dung Text: Đại cương cây khoai lang
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