Stems growth

Dry weight of stems (living and dead) can be calculated using partitioning factors to roots and stems (see topic Partitioning factors) and total biomass rate (see topic Total biomass rate).

Firstly, an AFGEN table is used for deriving the relative death rate of stems in function of development stage (Fdeadstems, Kg Kg-1 d-1). In the figure below there is the pattern of this relationship for a rice cultivar.

Then the dry weight rate of dead stems can be calculated as:

where Bdeadstems is daily rate of dry weight of death stems (Kg ha-1 d-1), Blivstems,s is daily state of dry weight of living stems at time step s (Kg ha-1 d-1) and Fdeadstems is the relative death rate of stems in function of development stage (from AFGEN table, Kg Kg-1 d-1).

Then, the available aboveground biomass rate (Babove, see topic Living leaves growth) is used for the calculation of dry weight of living stems with the equation:

where Blivstems is daily rate of dry weight of living stems (Kg ha-1 d-1), Babove is the daily available aboveground biomass rate (Kg ha-1 d-1), Pstems is partitioning factor of stems (unitless) and Bdeadstems is daily rate of dry weight of dead stems (Kg ha-1 d-1).

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