StemElongation
The StemElongation phase in Canola represents the developmental period from GreenBud to StartFlowering. It is influenced by thermal time only and the target is influenced by photoperiod.
Overview
The GenericPhase model simulates the time between the GreenBud and StartFlowering stages with following parameters:
- Start: GreenBud
- End: StartFlowering
- IsEmerged: TRUE
- Target: Calculated based on cultivar-specific parameters and photoperiod (Whish et al. 2020).
The Target thermal time is calculated using the following response function based on photoperiod:
\[ TT = TT_{base} + TT_{P} \times f_{pp}(d) \]
Where: - \(TT\) = Target thermal time (°Cd) - \(TT_{base}\) = Base thermal time (°Cd) with default value of 250 °Cd - \(TT_{P}\) = Thermal time response to photoperiod sensitivity (°Cd) with default value of 0 °Cd, i.e. no photoperiod sensitivity - \(f_{pp}(d)\) = Multiplier for photoperiod response function based on day length \(d\) (hours). This multiplier is defined by 1 at day length of 13 hours and 0 at day length of 14 hours. It means the flowering time will be accelerated when day length is longer than 13 hours and equal to \(TT_{base}\) at 14 hours.
Cultivar-Specific Parameters
| Name | Description | Default Value |
|---|---|---|
| [Phenology].StemElongation.Target.Base.FixedValue | Base thermal time target during stem elongation (°Cd) | 250.0 |
| [Phenology].StemElongation.Target.PPResponse.Amount.FixedValue | Thermal time response to photoperiod sensitivity (°Cd) | 0 |
Practical Example
no practical example available
References
Whish, J. P. M., J. M. Lilley, M. J. Morrison, B. Cocks, and M. Bullock. 2020. “Vernalisation in Australian Spring Canola Explains Variable Flowering Responses.” Field Crops Research 258 (November): 107968. https://doi.org/10.1016/j.fcr.2020.107968.