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Moisture migration in a silo during a cold season occurs because

  • A.Bulk density falls near the wall
  • B.Respiration stops in cold weather
  • C.Convection carries moisture to the cold top
  • D.Grain absorbs water directly from the soil

Answer: C

Air warmed at the centre rises, cools against the cold roof and deposits its moisture on the top layer, where crusting and mould then begin. Aeration to keep the bulk at an even temperature is the standard preventive measure.

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