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Articles

VALIDATION OF A GREENHOUSE TOMATO CROP TRANSPIRATION MODEL IN MEDITERRANEAN CONDITIONS

Article number
449_77
Pages
551 – 560
Language
Abstract
The validation of a tomato crop transpiration model based on the Penman-Monteith formulation and involving stomatal regulation with respect to greenhouse climatic conditions was tested in the south of France (Avignon) over three complete cropping periods against transpiration measurements at the crop scale.
A good agreement between predicted and measured values of transpiration was found as long as no climatic stress occurred.
Under stress conditions, characterised by high temperatures and saturation deficits, the model is no longer valid.
The influence of other variables, such as substrate temperature or electric conductivity of the nutrient solution in the rooting medium has to be considered.
A special attention was paid to the nutrient concentration of the supply solution.
Its influence was analysed with respect to the diurnal courses of leaf temperature, stomatal conductance and leaf water content.
The mechanisms involved in these phenomena are discussed and a model describing the reduction of crop transpiration against the increase of salinity is proposed and validated.

Publication
Authors
T. Boulard, R. Jemaa, A. Baille
Keywords
Tomato, transpiration, models, mediterranean climate, stomatal regulation
Full text
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