related to or caused by particular soil conditions, as of texture or drainage, rather than by physiographic or climatic factors.

< German edaphisch (1898); see edaphon, -ic

edaphically, adverb
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World English Dictionary
edaphic (ɪˈdæfɪk)
Compare biotic of or relating to the physical and chemical conditions of the soil, esp in relation to the plant and animal life it supports
[C20: from Greek edaphos bottom, soil]

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American Heritage
Science Dictionary
edaphic   (ĭ-dāf'ĭk)  Pronunciation Key 
  1. Relating to soil, especially as it affects living organisms. Edaphic characteristics include such factors as water content, acidity, aeration, and the availability of nutrients.

  2. Influenced by factors inherent in the soil rather than by climatic factors.

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