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Effect of the Heterogeneity of the Radiation Distribution on the Crop activity

Abstract : The crop activity inside a greenhouse is strongly affected by the local microclimatic conditions (radiation, temperature and humidity of air in particular). In order to reduce the consumption of energy and water, the control of these parameters is of prime interest. The objectives of the present study are: (i) to analyse the evolution of the microclimate in the vicinity of the canopy all day long and (ii) to assess the impact of the spatial heterogeneity of the radiation distribution on the air humidity and evapotranspiration of the crop. A 100 m2 greenhouse ompartment located in Angers (47° 28' N, 0° 33' E) was equipped with a set of sensors including temperature and humidity probes as well as solar silicium cells and pyranometers. The evapotranspiration was measured at two locations with balances. Under rather clear sky conditions, the horizontal distribution of the radiation reaching the crop was analysed and its impact on the evapotranspiration, the humidity and the temperature inside the crop was investigated. The values of the climatic parameters averaged over time (from 9 am to 5 pm) evidence the role played by the heterogeneity of the radiation distribution on the crop response and on the microclimatic conditions in the vicinity of the plants. At a shorter time scale (2 hours), strong heterogeneities are also observed : different evolutions of their characteristics all over the day have been noticed. Knowing both the spatial distribution and temporal evolution of the crop activity could help identify the plant requirements and adapt a strategy for heating and irrigation.
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Submitted on : Friday, September 7, 2012 - 3:31:09 PM
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B. Morille, Christophe Migeon, Pierre-Emmanuel Bournet. Effect of the Heterogeneity of the Radiation Distribution on the Crop activity. Acta Horticulturae, International Society for Horticultural Science, 2011, non paginé. ⟨10.17660/ActaHortic.2012.952.95⟩. ⟨hal-00729275⟩



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