FLNParameterEnvironment

A data structure in APSIM Next Generation that captures the controlled environmental conditions under which Final Leaf Number (FLN) observations were made. These parameters describe the specific vernalisation and photoperiod treatments used in experiments, enabling accurate parameterisation of genotype-specific developmental responses.

Overview

The FLNParameterEnvironment class is a data container within the CAMP phenology framework. It stores the specific environmental settings under which Final Leaf Number (FLN) was observed in controlled environment experiments, including vernalisation treatment temperature, duration, and photoperiod conditions.

These environmental parameters are essential for the CalcCAMPVrnRates function, which uses them in combination with FinalLeafNumberSet observations to calculate cultivar-specific vernalisation rate parameters. By capturing the experimental conditions, this class enables accurate translation of controlled environment observations into simulation parameters that represent genotype × environment interactions affecting phenological development.

Model Structure

This section describes how this model is positioned within the APSIM framework. It outlines the broader structural and computational components that define its role and interactions in the simulation system.

This model inherits structural and functional behaviour from the following core APSIM components:

Connections to Other Components

This section describes how the model interacts with other components in the APSIM Next Generation framework.
These connections allow the model to exchange information—such as environmental conditions, developmental stage, or physiological responses—with other parts of the simulation system. For a general overview of how model components are connected in APSIM, see the Connections Overview.

This data structure is used by:

Component Model Connection Type Description
CAMP CAMP Parent Main phenology model that contains this environment data.
CalcCAMPVrnRates CalcCAMPVrnRates Used by Uses environment data to calculate vernalisation rate parameters.

Model Variables

This section lists the key variables that describe or control the behaviour of this component. Some variables can be adjusted by the user to modify how the model behaves (configurable), while others are calculated internally and can be viewed as model outputs (reportable). For a general explanation of variable types and how they are used within the APSIM Next Generation framework, see the Model Variables Overview.

Configurable and Reportable Properties

This class stores the following environmental parameters from controlled environment experiments:

Property Type Description
VrnTreatTemp double Vernalisation treatment temperature (°C)
VrnTreatDuration double Days of exposure to vernalising temperature
TreatmentPp_L double Photoperiod under long-day treatment (hours)
TtEmerge double Observed thermal time from sowing to emergence (°Cd)

Read-Only Reportable Properties

No read-only properties are available for this model.

User Interface

FLNParameterEnvironment can be added as a child of a CAMP node in the model tree. Right-click the CAMP node, select “Add Model…”, and search for FLNParameterEnvironment in the Filter Box.

Parameters should be set based on the actual controlled environment conditions used when measuring the Final Leaf Number observations. These typically come from growth chamber or glasshouse experiments designed to separate vernalisation and photoperiod effects.

Practical Example

Typical values used for wheat cultivar parameterisation:

Parameter Typical Value Description
VrnTreatTemp 5-8°C Cold temperature during vernalisation treatment
VrnTreatDuration 40-60 days Duration of vernalisation treatment
TreatmentPp_L 16 hours Long photoperiod treatment
TtEmerge 90-100°Cd Thermal time from sowing to emergence

These values represent standard controlled environment conditions used to characterise vernalisation and photoperiod responses in wheat.

See Also