Biological Components

Microbes

• protozoa and nematodes (10 - 106/g soil)
• bacteria (> 1 billion / g soil)

  aerobes & anaerobes
  
  beneficials (symbionts - Rhizobia)
  Pathogenic (various)

• Fungi (10 - 20 million / g soil; molds, mycorrhizae)

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