Estimation of light interception, photosynthesis, and light use efficiency with 3D scanned models of paprika by growth stage in greenhouses

Light interception of crops is crucial for estimation of growth and development.
The light interception changes over time and growth stage due to structural and optical changes.
Functional-structural plant model (FSPM), which reflects structural and optical characteristics of crops, is advantageous in this aspect than process-based model.
However, its reconstruction is indirect and the calculation of light interception involves home-built optical simulations.
We constructed structural models of actual greenhouse and paprika plants in one- or two-week interval with 3D scanning and performed an optical simulation on it.
The distributions of photosynthetic rate and light use efficiency were calculated with obtained light distributions and FvCB model.
Temporal and spatial distributions of light and photosynthetic rate within the canopy were obtained with growth stage.
Also transpiration rate and carbon dioxide consumption could be estimated from our results.
This method would contribute to the comprehensive modeling of greenhouse operation and estimation of crop productivity in greenhouses.

XXX International Horticultural Congress IHC2018: III International Symposium on Innovation and New Technologies in Protected Cultivation

I.H. Hwang, W.H. Kang, D.H. Jung, D.P. Kim, J.W. Kim, J.H. Kim, K.S. Park, J.E. Son

3D scanned model, CO₂ consumption, FSPM, light distribution, ray-tracing simulation

https://doi.org/10.17660/ActaHortic.2020.1271.29