Vegetative growth (LAI, DM), water/N uptake Table 2: Stages of phenological development simulated in APSIM_Barley. Table 2 lists the stage code, name and the key processes starting at the commencement of each stage.
#APSIM VAPOR PRESSURE DEFICIT CODE#
It can output stage code and names as well as equivalent Zadok’s stage.
Barley Module Structure PhenologyĪPSIM-Barley uses 11 crop stages and ten phases (time between stages). Most of the model constants (species-specific) and parameters (cultivar specific) are externalised from the code. The current version of the model is implemented within the APSIM Plant model framework which is currently used for other crops such as grain legumes and canola. Go to generic Plant model documentation Barley Module HistoryĪPSIM-Barley was developed from a combination of the approaches used in previous APSIM barley modules: Asseng et al. It also predicts grain size and grain number. Basically the module simulates phenological development, leaf area growth, biomass and N concentration of leaves, stems, roots and grains on a daily basis. Barley stover and root residues are ‘passed’ from barley to the surface residue and soil nitrogen modules respectively at harvest of the barley crop.Īpproaches used in modelling crop processes balance the need for comprehensive description of the observed variation in crop performance over diverse production environments and the need to avoid reductionist approaches of ever-greater complexity with large numbers of parameters that are difficult to measure.Ī list of the module outputs is provided in the ‘Barley module outputs’ section below. Information on crop cover is also provided to the water balance module for calculation of evaporation rates and runoff. The barley module returns information on its soil water and nitrogen uptake to the soil water and nitrogen modules on a daily basis for reset of these systems. Barley growth and development in this module respond to weather (radiation, temperature), soil water and soil nitrogen. The APSIM-Barley module simulates the growth and development of a barley crop in a daily time-step on an area basis (per square meter, not single plant).