18      crop_code
PO      crop_name_1
Potato  crop_name_2
9317.9  total_biomass_C
0.55     harvested_part_portion
0.35     portion_of_shoot
0.1     portion_of_root_residue
41.4    plant_CN_ratio
40.0      harvested_part_CN
60.0      root_CN_ratio
40.0      shoot_CN_ratio
636     water_requirement
4       max_LAI
0.5     max_height
2100    TDD_10
1       N_fix
0.50	  initial efficiency of use of absorbed light at 20 C, 340 CO2, (kg CO2/ha/h)/(J/m2/s)
30      maximum rate of leaf photosytensis, kg CO2/ha/h
0.030   rate of crop development in vegetative stage at a reference temperature and reference daylength (1/d, 0.040) 
0.018   rate constant of crop development in reproductive phase at a reference temperature, 1/d (0.018)
1.0     economic copmponent/storage organc by weight
300.0   specific leaf weight constant, kg dm/ha
2000.0  specific stem weight, kg dm/ha
0.65     ratio of internal/external CO2 concentrations, 0.59-0.66
1.0     maximum root depth for crop, m
0.014    increase rate of root depth, m/day


