modelTomatoYieldModel
Information
In this work, a recent yield model developed and validated for a variety of temperatures is implemented. The carbohydrate assimilation is modeled by distinguishing three crop parts: the leaves, the fruits, and the stems (roots are considered together with the stems). Mass balances are applied on each part and on the buffer. Carbohydrate flows are computed as a function of fixed parameters related to the tomato crop.
The inputs of the model are the instantaneous temperature of the canopy, the CO2 concentration of the greenhouse air and the PAR absorbed by the canopy. Their values are retrieved from the greenhouse climate simulation model, in which the former two are state variables from the Canopy and the Air models, and the latter is function of the global irradiation (computed in the Solar_model model).
A detailed description of the model equations can be found in the online documentation of the library https://greenhouses-library.readthedocs.io/en/latest
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Integer | n_dev | 50 | Number of fruit development stages |
| Real | LAI_MAX | 3.5 | Maximum leaf area index, m2 leaf/m2 greenhouse |
| Initialization | |||
| Real | LAI_0 | 0.4 | |
| Real | T_canSumC_0 | 0 | |
| Real | C_Leaf_0 | 15e3 | |
| Real | C_Stem_0 | 15e3 | |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Real | R_PAR_can | 460 | Total PAR absorbed by the canopy computed in the solar and illumination model |
| Real | CO2_air | 600 | CO2 concentration of the greenhouse air, umol CO2/mol air |
| Modelica.Units.SI.Temperature | T_canK | 293.15 | Instantaneous canopy temperature |
| Real | C_Buf_MAX | 20e3 | Maximum buffer capacity |
| Real | C_Buf_MIN | 1e3 | Minimum amount of carbohydrates in the buffer |
| Real | MC_AirBuf | Net photosynthesis rate | |
| Real | C_Buf | Carbohydrates in the buffer | |
| Real | CO2_stom | CO2 concentration in the stomata, umol CO2/ mol air | |
| Real | LAI | Leaf Area Index, m2 leaf/m2 greenhouse | |
| Real | MC_BufFruit | Carbohydrate flow from the buffer to the fruits | |
| Real | MC_BufLeaf | Carbohydrate flow from the buffer to the leaves | |
| Real | MC_BufStem | Carbohydrate flow from the buffer to the stems and roots | |
| Real | T_canC | ||
| Real | T_can24C | ||
| Real | T_canSumC | Temperature sum | |
| Real | MN_BufFruit_1 | Fruit set in the first development stage, fruits/(m2.s) | |
| Real | MN_BufFruit_1_MAX | Maximum fruit set, fruits/(m2.s) | |
| Real | MC_BufFruit_1 | Carbohydrate flow to the first development stage | |
| Real | MC_FruitHar | ||
| Real | W_Fruit_1_Pot | Potential dry matter per fruit in fruit development stage one, mg/fruit | |
| Real | MC_BufAir | Growth respiration of the total plant | |
| Real | MC_FruitAir_g | Growth respiration of the fruits | |
| Real | MC_LeafAir_g | Growth respiration of the leaves | |
| Real | MC_StemAir_g | Growth respiration of the stems and roots | |
| Real | MC_FruitAir | Total maintenance respiration of the fruits | |
| Real | MC_LeafAir | Maintenance respiration of the leaves | |
| Real | MC_StemAir | Maintenance respiration of the stems and roots | |
| Real | C_Leaf | Carbohydrate weight of leaves | |
| Real | C_Stem | Carbohydrate weight of stems and roots | |
| Real | C_Leaf_MAX | Maximum allowed carbohydrates stored in the leaves | |
| Real | MC_LeafHar | Leaf harvest rate | |
| Real | DM_Har | Accumulated harvested tomato dry matter | |
| Real | MC_AirCan | CH2O flux between the greenhouse air and the canopy, which depends on the canopy photosynthesis rate and respiration processes | |
| Real | MC_AirCan_mgCO2m2s | CO2 flux between the greenhouse air and the canopy, mg CO2/(m2.s) | |
| Modelica.Blocks.Sources.Ramp | plant_density | Plant density increases after 1 month, and reaches 3.5 after 2 months |