《Table 1 The content of organic matter and nutrient elements in biogas residue and biogas liquid of

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《Application Status and Prospects of Biogas Fertilizer in Modern Agricultural Production》

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The nutrient elements such as protein，hemicellulose，auxin，microbial mass and nitrogen，phosphorus and potassium in raw materials are retained in biogas residue and biogas liquid during anaerobic fermentation[7].Therefore，the biogas residue and biogas liquid have high nutrient content and unique properties.Biogas residue is a kind of solid material which is not decomposed or decomposed completely in the process of anaerobic fermentation and other impurities deposited in the bottom of the reactor after drying.It contains not only nitrogen phosphorus potassium and other nutrients but also organic matter，humic acid，crude protein and so on.Biogas liquid is the residue of anaerobic fermentation，which contains humic acid，lignin，gibberellin，linoleic acid，beneficial bacterial mass and so on[8].Table 1 shows the content of organic matter and nutrient elements in biogas residue and biogas liquid of different fermentation materials determined by Xu Yanxi et al.[9].