These figures belong to the named source and method. Historical costs are not current quotations. A value without its stage, material basis or measurement location is not a farm instruction.
| What is measured | Value and basis | Source and limitation |
|---|---|---|
| Carbon dioxide, cropping | 1000-1500 ppm | ICAR-DMR manual, 2011. Oyster sits below 600 to 800 ppm |
| Air changes | 6 per hour | ICAR-DMR manual, 2011. First two flushes, then four per hour |

