code|description
--|Unspecified
AGR|Agar
AQU|Aqueous
ART|Artificial soil
CUL|Culture
FAB|Fabric or similar material
FLT|Filter paper
FW|Fresh water
HUM|Humus
HYP|Hydroponic
LIT|Litter
MAN|Manure
MIN|Mineral soil
MIX|Media mixture (with comment)
NAT|Natural soil
NC|Not coded
NONE|No substrate
NR|Not reported
POP|Plaster of paris
SED|Sediment
SLG|Sludge
SW|Salt water
UKN|Unknown media
UKS|Unknown soil
