|All it takes is a can of spray polyurethane and
soil clods to demonstate soil air.
|Spray the clod and wait a minute or two before
dropping the clod in a jar of water.
|Drop the clods gently, and watch the bubbles.
|Air will bubble from some clods for up to 20
minutes or more.
|Soil clods from surface soils from orchards,
pastures, and lawns generally will have a high soil air content.
|Soil clods from subsoils, or soils from
conventionally cultivated fields will generally have lower soil air contents.
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