ISHS Acta Horticulturae 559: V International Symposium on Protected Cultivation in Mild Winter Climates: Current Trends for Suistainable Technologies
SIMULATING THE BEHAVIOUR OF A GREENHOUSE ROSE CROP BY MEANS OF A MODEL INCLUDING PHYSICAL AND PHYSIOLOGICAL FEEDBACK LOOPS |
| Authors: | M.M. González-Real, A. Baille |
| Keywords: | Greenhouse, modelling, rose, gas exchange, climate control, misting, water vapour, stomatal conductance |
| Abstract:
This paper deals with the simulation of the physical and physiological feedbacks in a climate-controlled greenhouse, and their consequences on net CO2 assimilation (Ac), stomatal conductance (gc) and transpiration (E) of a rose row crop. To this purpose, two sub-models were developed. The physical sub-model included the classical energy and mass transfers equations, greenhouse light penetration and procedures to simulate the effects of ventilation, evaporative cooling (mist-system) and CO2 enrichment. The physiological sub-model included a simple scheme for estimating light absorption by a row crop and used a biochemically based photosynthesis model coupled to a conductance model. This coupled model described the influence of environment variables and their interactions on the response of stomata through their effects on Ac. Coupling the physical and physiological sub-models through a variable boundary layer conductance enabled to realistically simulate the climatic and physiological feedback loops on the gas exchange processes. Some examples of the predicted response of Ac, gc and E to climate and plant manipulations such as ventilation, evaporative cooling and crop LAI are presented and discussed. | |
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