化肥和粪肥都释放氮到自然生态系统，如河流，从而破坏自然的平衡。
Both fertilizers and manure release nitrogen into natural systems such as rivers, upsetting the natural balance.
通常，农业化肥流入水生生态系统，促使生物急速的生长。
Agricultural fertilizers often drain into aquatic ecosystems and spur a frenzy of growth.
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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