#fertilizer__plant_food__plantfood  any substance such as manure or a mixture of nitrates used to make soil more fertile
  supertype:  chemical  produced by or used in a reaction involving changes in atoms or molecules
  substance:  sodium_nitrate  potassium_nitrate  ammonium_nitrate
  subtype:  organic_fertilizer__organicfertilizer__organic  a fertilizer that is derived from animal or vegetable matter
     subtype:  bonemeal  fertilizer made of ground bones
     subtype:  neem_cake  residue after oil is pressed from neem seeds
     subtype:  manure  any animal or plant material used to fertilize land especially animal excreta usually with litter material
        subtype:  chicken_manure__chickenmanure  chicken excreta used as fertilizer
        subtype:  cow_manure__cowmanure  cow excreta used as fertilizer
        subtype:  green_manure__greenmanure  a growing crop that is plowed under to enrich soil
        subtype:  horse_manure__horsemanure  horse excreta used as fertilizer
        subtype:  night_soil__nightsoil  human excreta used as fertilizer
     subtype:  fish_meal  ground dried fish used as fertilizer and as feed for domestic livestock
     subtype:  guano  the excrement of sea birds; used as fertilizer

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