利用沼肥可替代部分化肥，生产无公害农产品，使沼气工程的经济效益、社会效益和生态效益大大提高。
The economical, social, and ecological benefits of biogas engineering would be improved greatly by the utilization of biogas residues on the production of safe food.
利用沼肥可替代部分化肥，生产无公害农产品，使沼气工程的经济效益、社会效益和生态效益大大提高。
The economical, social, and ecological benefits of biogas engineering would be improved greatly by the utilization of biogas residues on the production of safe food.
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