RUE is reduced whenever extremes of temperature, soil water shortage or excess, or plant nitrogen deficit limit photosynthesis. Model Components OverviewĬrop dry weight accumulation is driven by the conversion of intercepted radiation to biomass, via a radiation-use efficiency (RUE). Same as Plant crop section but there is the ability to change the parameters between plant and ratoon crops. Sucrose and cane stalk Partitioning Parameters Nitrogen Contents and Nitrogen Stress Factors Water Use Parameters and Water and temperature Stress Factors Upper and lower bounds for met and soil variables They are listed below with some examples of the type of parameters included in each. There are five separate categories of variables in the sugar module’s ini file. Parameterisation Structure of the INI file Phenology and potential growth and demands are calculated during the prepare stage and actual growth and changes to state variables are calculated during the process stage. The structure of the APSIM sugar model can be described as follows:įor each APSIM time step the calculation of sugar model states and transitions are performed in a set order in different stages of the APSIM cycle through each time step.