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 |
|---|---|---|
| pH of finished compost | 7.2 to 7.8 pH | ICAR-DMR manual, 2011. Outside this band white plaster mould may invade |
| Free ammonia at spawning | 8 to 10 ppm | ICAR-DMR manual, 2011. Upper limit, tested by a declared safe method |

