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 |
|---|---|---|
| Manure cover over spent compost | 10 cm | NHB DPR model, 2018. Minimum cover in a compost pit to check fly breeding |
| Fly screen mesh | 35 mesh | NHB DPR model, 2018. On doors and ventilators, 35 mesh or finer |

