Emerging
The Emerging is a phenological phase in Lentil used to represent the development period from Germination to Emergence. This phase represents the period when the seedling grows through the soil and emerges from the surface.
Overview
The EmergingPhase model simulates the emergence of lentil seedlings. This phase begins after germination is complete and ends when the seedling has broken through the soil surface. See EmergingPhase for more details.
Characteristics
- Duration depends on soil temperature and soil water conditions
- The seedling uses stored seed reserves to fuel growth
- Coleoptile elongation occurs to push the shoot through the soil
- Once the first leaves break through the soil surface, the plant transitions to the emergence stage
Cultivar-Specific Parameters
The emerging phase uses thermal time accumulation to determine completion.
| Name | Description | Default Value |
|---|---|---|
| [Phenology].Emerging.TargetThermalTime | Accumulated thermal time required for emergence (°Cd) | Variable by cultivar |
Practical Considerations
Key factors affecting emergence:
- Soil temperature: Higher temperatures increase the rate of thermal time accumulation
- Soil moisture: Adequate moisture supports seedling growth and emergence
- Soil depth: Sowing depth influences emergence time and success
- Soil crust: Hard-setting soils can prevent seedling emergence
The model simulates the thermal time-dependent emergence process to predict when seedlings will break through the soil.