Harvest

At harvest some carbon will be harvested and removed from the system. The amounts of carbon that are removed from the leaf pool is calculated as:
                                           (5.57)

where f_leafharvest is a parameter. Harvest from the grain, stem and root carbon pools is calculated analogously by exchanging f_leafharvest with f_grainharvest, f_stemharvest and f_rootharvest respectively. These parameters are also used to calculate the harvest fractions from the old stem, leaves and roots in perennials.

At harvest it is possible that some parts of the plant will be removed from the plant, but left on the field as litter. These litter flows are calculated as:

                   (5.58)

where f_leaflittharv is a parameter. Similar flows are calculated for grain, stem and roots by exchanging f_leaflittharv to f_{grainlittharv}, f_stemlittharv and f_rootlittharv respectively.

Note that it is possible to leave carbon in the plant after harvest. Unless the field is ploughed after harvest or the plant maximum life is equal to one, carbon will remain in the plant to the following growing season i.e. the plant is a perennial.