d_preparation_type
| CODE | DESCRIPTION | FROM_YEAR | TO_YEAR |
|---|---|---|---|
| 11 | Soil mechanical preparation – Any kind limited to the humus and topsoil (<10 cm depth) | 1984 | |
| 12 | Soil mechanical preparation – Ploughing | 1984 | |
| 13 | Soil mechanical preparation – Deep loosening with a subsoiler | 1984 | |
| 14 | Soil mechanical preparation – Bed shaping (to build ridges in wet sites) | 1984 | |
| 15 | Soil mechanical preparation – Preparation by isolated spots for one or few seedlings | 1984 | |
| 19 | Soil mechanical preparation – Other (to be described in other information) | 1984 | |
| 21 | Soil liming – With crushed limestone | 1984 | |
| 22 | Soil liming – With crushed dolomite | 1984 | |
| 23 | Soil liming – With wood ash | 1984 | |
| 29 | Soil liming – With another type of material (to be described in other information) | 1984 | |
| 31 | Soil fertilization – With synthetic fertilizer | 1984 | |
| 32 | Soil fertilization – With sewage sludge | 1984 | |
| 33 | Soil fertilization – With paper mill sludge | 1984 | |
| 39 | Soil fertilization – With another type of material (to be described in other information) | 1984 | |
| 41 | Slash removal – Windrowing | 1984 | |
| 42 | Slash removal – Burning | 1984 | |
| 43 | Slash removal – Harvesting | 1984 | |
| 44 | Slash removal – Grinding and scattering | 1984 | |
| 49 | Slash removal – Other (to be described in other information) | 1984 | |
| 51 | Stumping – Excavating then windrowing | 1984 | |
| 52 | Stumping – Excavating then burning | 1984 | |
| 53 | Stumping – Harvesting | 1984 | |
| 54 | Stumping – Grinding and scattering | 1984 | |
| 59 | Stumping – Other (to be described in other information) | 1984 | |
| 99 | Unknown | 1984 |