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Most soil bacteria grow best at a soil pH that is

  • A.Near neutral
  • B.Strongly acidic
  • C.Strongly alkaline
  • D.Below three

Answer: A

Bacterial activity, including nitrification and most nitrogen fixation, peaks close to neutrality. As soil acidifies, fungi come to dominate because they tolerate low pH far better, which is why acidic forest soils are fungally driven.

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