Nong-flavor liquor has an important position in Chinese liquor market and its high quality is closely related to its pit mud.Pit mud quality has direct influence on liquor styles and the quality and the yield of base liquor.So there is an old saying: pit of thousands of years.In practice,the construction of pits by manmade pit mud could become manmade aged pits after long-term domestication.The quality of manmade pit mud is directly related to its bacterial varieties and amount especially caproic acid bacte...