#enrichment  act of making fuller or more meaningful or rewarding
  supertype:  #improvement  the act of improving something: "their improvements increased the value of the property"
  subtype:  #fertilization__fertilisation__fecundation__dressing  making fertile as by applying fertilizer or manure
     subtype:  #top_dressing__topdressing  a layer of fertilizer or manure not plowed in

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