1. ground dried fish used as fertilizer and as feed for domestic livestock. 
   磨碎的干鱼，用作肥料或家畜的饲料。
2. the chief solid component of mammalian urine; synthesized from ammonia and carbon dioxide and used as fertilizer and in animal feed and in plastics. 
   哺乳动物尿中主要的固体成份，可由氨和二氧化碳合成，用作肥料、饲料和制塑料。
3. fertilizer of secondary nutrients 
   中量元素肥料
4. pollution by chemical fertilizer 
   化肥污染
5. To add fertilizer to. 
   给…添加肥料

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