关键词: 沼气残余物, 肥料, 土壤质量

Abstract: Anaerobic digestion is an optimal way to treat organic waste matter, resulting in biogas and residue. Application of biogas residue to agricultural land has an important significance for saving energy and cycling of nutrient resources. The characteristic of biogas residue was discussed from such aspect as effects of biogas residue on soil microbiology and quality, effects of biogas residue on yield, effects on quality and nutrient uptake of crops, post-treatment of biogas residue and its application, and monitoring the application of biogas residue to arable land etc.. Biogas residue could enhance crop yield as fertilizer and improve soil fertility as a soil amendment. It is important for farmers to replace techniques such as simple land spreading and band spreading with shallow injection to minimize NH4-N loss and optimize benefits of the digested residue. To further reduce the risk of N leakage, biogas residue could be further processed and stabilized in compost. Molecular biology method is helpful for analyzing the complecated characteristics of soil microorganism, and this method should be further exploited and utilized in early monitoring of soil quality after applying biogas residue.

Key words: biogas residue, fertilizer, soil quality