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 |
|---|---|---|
| Oyster CO2 ceiling during cropping | under 600 (manual) or under 800 (folder) ppm | ICAR-DMR manual, 2011. Two DMR figures; both mean ventilate two or three times a day. |
| Button CO2 for pinning | 800-1000 ppm | ICAR-DMR manual, 2011. After venting; up to 1,500 ppm during cropping. |

