Total biomass rate

Daily total biomass rate can now be calculated starting from growth respiration rate (see topic Growth respiration).

Firstly, the conversion efficiency factor of assimilates of the total crop has to be calculated, as a weighted average of the efficiencies for the various plant organs:

where CEfftot is the conversion efficiency factor of assimilates of the total crop (Kg Kg-1), Pleaves is partitioning factor of leaves, CEffleaves is the conversion efficiency factor of assimilates of leaves (Kg Kg-1), Pstems is partitioning factor of stems, CEffstems is the conversion efficiency factor of assimilates of stems (Kg Kg-1), Psto is partitioning factor of storage organs, CEffsto is the conversion efficiency factor of assimilates of storage organs (Kg Kg-1), Proots is partitioning factor of roots, CEffroots is the conversion efficiency factor of assimilates of roots (Kg Kg-1).

The conversion efficiency factor of the assimilates of the various organs should be provided by the user.

Next step, the total biomass rate of the crop can be calculated as:

where Btot is the total biomass rate of the crop (Kg ha-1 d-1), CEfftot is the conversion efficiency factor of assimilates of the total crop (Kg Kg-1) and Rgrowth is daily growth respiration rate (Kg ha-1, d-1).

Then, for integrating the daily total biomass rate of the crop into the state variable, the following equation is applied:

where Btot,s is daily total biomass at time step s (Kg ha-1 d-1), Btot,s-1 is daily total biomass at time step s-1 (Kg ha-1 d-1) and Btot is the total biomass rate of the crop (Kg ha-1 d-1).

Created with the Personal Edition of HelpNDoc: Easily create EBooks