Budding

The Budding phase in Chickpea represents the developmental period from StartBudding to StartFlowering. This phase covers the period when floral buds are visible and developing until the first flowers open.

Overview

The GenericPhase model simulates the time between StartBudding and StartFlowering stages.

  • This phase starts at StartBudding and ends at StartFlowering
  • The model uses daily Thermal Time, retrieved from the [Phenology].ThermalTime function
  • The Target thermal time is cultivar-specific and influenced by photoperiod at end of the juvenile phase.

Bud Development

During the budding phase:

  • Floral buds become visible at nodes
  • Buds continue to develop and enlarge
  • The plant continues some vegetative growth
  • Branching may continue depending on environmental conditions and cultivar

The transition from bud development to flowering is primarily driven by thermal time accumulation and photoperiod at the end of the juvenile phase (Robertson et al. 2002).

Table 1: Photoperiod influence on target thermal time for budding phase in chickpea (Robertson et al. 2002).
Photoperiod (h) Target thermal time (°Cd)
10.0 501.6
12.4 50.0
17.0 50.0
Figure 1: Photoperiod influence on target thermal time for budding phase in chickpea (Robertson et al. 2002).

Cultivar-Specific Parameters

Name Description Default Value
[Phenology].Budding.Target.XYPairs.X Photoperiod at the end of the juvenile phase (h) 10,12.43,17
[Phenology].Budding.Target.XYPairs.Y Target thermal time for bud development (°Cd) 501.6, 50, 50

References

Robertson, M. J., P. S. Carberry, N. I. Huth, J. E. Turpin, M. E. Probert, P. L. Poulton, M. Bell, G. C. Wright, S. J. Yeates, and R. B. Brinsmead. 2002. “Simulation of Growth and Development of Diverse Legume Species in APSIM.” Australian Journal of Agricultural Research 53 (4): 429–46. https://doi.org/10.1071/AR01106.