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