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 |
|---|---|---|
| Light trap | 15 watt | NHB DPR model, 2018. yellow bulb over an oil coated sheet |
| Cover on spent compost | 10 cm of manure | NHB DPR model, 2018. in a pit away from the rooms |

