Articles
Calibration and validation of a leaf net photosynthesis simulation model in greenhouses
Article number
1425_39
Pages
305 – 312
Language
English
Abstract
Photosynthetic activity is one of the basic processes related to crop productivity.
Modeling photosynthesis as a function of incident radiation and CO2 concentration is essential to predict the effectiveness of climate control systems.
The present work was developed with the aim of calibrate a model to calculate the leaf net photosynthesis rate using the photosynthetic activity measured in leaves of five greenhouse crops.
The experimental work was carried out from 2019 to 2023 in four multispan greenhouses of the Experimental Station “Catedrático Eduardo Fernández” of the Centre for Innovation and Technology Transfer “Fundación UAL – ANECOOP” (Almería). Three tomato (Solanum lycopersicum L.) and two pepper (Capsicum anuum L.) crop cycles were used for validation.
The plants were grown in “arenado” sand mulch soil, typically used in Almería greenhouses, and in coconut substrate.
Leaf photosynthetic activity was measured with a portable analyzer in plants randomly chosen for different days during the whole crop cycles, with a total of 4377 measurements.
The light use efficiency of leaves
L, the leaf conductance to CO2 transfer 
and the leaf dark respiration rate Rd were calculated for each crop cycle.
The photosynthetic activity values obtained with the mathematical model were compared with the values measured on plant leaves.
A calibration has been carried out to minimize the estimation error, obtaining values of the three model parameters similar to those proposed in the original model, although the error is always greater than 15%. The analyzed model allows estimating the net photosynthesis measured in the leaves of pepper plants with better results (R2>54.9) than for tomato crops (R2<48.0). The predicted mean values for the five pepper crops remarkably close to the means of the measured values.
Modeling photosynthesis as a function of incident radiation and CO2 concentration is essential to predict the effectiveness of climate control systems.
The present work was developed with the aim of calibrate a model to calculate the leaf net photosynthesis rate using the photosynthetic activity measured in leaves of five greenhouse crops.
The experimental work was carried out from 2019 to 2023 in four multispan greenhouses of the Experimental Station “Catedrático Eduardo Fernández” of the Centre for Innovation and Technology Transfer “Fundación UAL – ANECOOP” (Almería). Three tomato (Solanum lycopersicum L.) and two pepper (Capsicum anuum L.) crop cycles were used for validation.
The plants were grown in “arenado” sand mulch soil, typically used in Almería greenhouses, and in coconut substrate.
Leaf photosynthetic activity was measured with a portable analyzer in plants randomly chosen for different days during the whole crop cycles, with a total of 4377 measurements.
The light use efficiency of leaves
L, the leaf conductance to CO2 transfer and the leaf dark respiration rate Rd were calculated for each crop cycle.The photosynthetic activity values obtained with the mathematical model were compared with the values measured on plant leaves.
A calibration has been carried out to minimize the estimation error, obtaining values of the three model parameters similar to those proposed in the original model, although the error is always greater than 15%. The analyzed model allows estimating the net photosynthesis measured in the leaves of pepper plants with better results (R2>54.9) than for tomato crops (R2<48.0). The predicted mean values for the five pepper crops remarkably close to the means of the measured values.
Authors
M.A. Moreno-Teruel, F.D. Molina-Aiz, M.N. Honoré, D.L. Valera-Martínez, F. Baptista, A. López-Martínez
Keywords
mathematical model, temperature, CO2, protected crop, plant activity
Groups involved
- Division Plant-Environment Interactions in Field Systems
- Division Precision Horticulture and Engineering
- Working Group Modelling in Fruit Research and Orchard Management
- Working Group Modelling Plant Growth, Environmental Control, Greenhouse Environment
- Division Greenhouse and Indoor Production Horticulture
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