Articles

SIMULATING THE BEHAVIOUR OF A GREENHOUSE ROSE CROP BY MEANS OF A MODEL INCLUDING PHYSICAL AND PHYSIOLOGICAL FEEDBACK LOOPS

Article number
559_66
Pages
441 – 448
Language
English
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.

Publication
Authors
M.M. González-Real, A. Baille
Keywords
Greenhouse, modelling, rose, gas exchange, climate control, misting, water vapour, stomatal conductance
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