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 |
|---|---|---|
| Air changes, first two flushes | 6 per hour | ICAR-DMR manual, 2011. 4 per hour from the third flush |
| Carbon dioxide during cropping | 1000-1500 ppm | ICAR-DMR manual, 2011. after pinheads become buttons |

