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T7+notes - Soil Aeration (Topic 7) Soil aeration is a vital...

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Soil Aeration (Topic 7) Soil aeration is a vital process because it largely controls the soil level of two life-sustaining gases: – Oxygen (O 2 ) and carbon dioxide (CO 2 ) _________________________________________________________ Nitrogen Oxygen Carbon dioxide ------------------------------- % -------------------------------- Atmosphere 78 21 0.039 (390 ppm) Soil Air 78 0-21 0.05-21 _________________________________________________________ What controls the composition of the soil atmosphere? C 6 H 12 O 6 + 6O 2 6CO 2 + 6H 2 O + energy organic matter + oxygen carbon dioxide + water + energy Respiration   Photosynthesis Factors affecting aeration (oxygen availability) are: 1. Microbial activity – consumption of O 2 and production of CO 2 2. Macropore content – a function of texture, structure, bulk density, compaction, etc. 3.
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This note was uploaded on 01/27/2011 for the course SSO 10 taught by Professor Randydahlgren during the Fall '10 term at UC Davis.

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T7+notes - Soil Aeration (Topic 7) Soil aeration is a vital...

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