If you take up organic farming, be sure to use organic fertilizer, not some artificial chemical. Organic describes things that are natural or related to nature.

In common usage, organic is used to mean “healthful” or “close to nature.” It can also describe foods grown without artificial pesticides or fertilizers. In other uses, organic refers to living things or material that comes from living things. In a more medical sense, organic means “relating to the organs of the body,” and in a legal sense, organic describes something that is central to an organization or a government.

Definitions of organic
  1. adjective
    being or relating to or derived from or having properties characteristic of living organisms
    organic life”
    organic growth”
    organic remains found in rock”
    integrated, structured
    resembling a living organism in organization or development
    involving or derived from living organisms; free from chemical treatments or additives
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    lacking the properties characteristic of living organisms
    amorphous, unstructured
    lacking the system or structure characteristic of living bodies
    not arising from natural growth or characterized by vital processes
    composed of matter other than plant or animal
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  2. adjective
    relating or belonging to the class of chemical compounds having a carbon basis
    “hydrocarbons are organic compounds”
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    relating or belonging to the class of compounds not having a carbon basis
  3. adjective
    involving or affecting physiology or bodily organs
    “an organic disease”
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    involving or affecting function rather than physiology
  4. adjective
    constitutional in the structure of something (especially your physical makeup)
    synonyms: constituent, constitutional, constitutive
    basic and fundamental
  5. adjective
    of or relating to foodstuff grown or raised without synthetic fertilizers or pesticides or hormones
    organic eggs”
    organic vegetables”
    organic chicken”
    conducive to or characteristic of physical or moral well-being
  6. adjective
    simple and healthful and close to nature
    “an organic lifestyle”
    conducive to good health of body or mind
  7. noun
    a fertilizer that is derived from animal or vegetable matter
    synonyms: organic fertiliser, organic fertilizer
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    fertilizer made of ground bones
    neem cake
    residue after oil is pressed from neem seeds
    any animal or plant material used to fertilize land especially animal excreta usually with litter material
    fish meal
    ground dried fish used as fertilizer and as feed for domestic livestock
    the excrement of sea birds or bats; used as fertilizer
    chicken manure
    chicken excreta used as fertilizer
    cow manure
    cow excreta used as fertilizer
    green manure
    a growing crop that is plowed under to enrich soil
    horse manure
    horse excreta used as fertilizer
    night soil
    human excreta used as fertilizer
    type of:
    fertiliser, fertilizer, plant food
    any substance such as manure or a mixture of nitrates used to make soil more fertile
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