Modelling soil-plant-atmosphere water transfer in greenhouse cultivation, under water restriction: how does plant growth affects transpiration and soil hydrodynamic properties?

Abstract : In greenhouses, optimized plant crop management is crucial for environmental reasons and for maintaining the competitiveness of the horticultural sector. In this context, reducing water consumption by increasing water efficiency is of high interest but requires predictive models of soil-plant-atmosphere water transfer. Such models have mainly been developed for open field conditions and very few models exist under greenhouse and plant in container contexts. The objective of this study is to develop a specific model predicting soil-plant water transport for plants in constrained conditions. In this prospect, " New Guinea " Impatiens were cultivated in containers inside a greenhouse during fifteen weeks under both water-comfort and water-restricted irrigation management. Plant transpiration and water status in peat were recorded every 10 minutes whereas measurements of peat saturated hydraulic conductivity (Ks) and water retention were performed every 30 days. Simulations of water-restricted plant transpiration were conducted using HYDRUS 1D with input data inferred from measurements. These data include the water-comfort plant transpi-ration, the hydraulic conductivity, the van Genuchten retention curve of peat and root water uptake parameters assuming that plant growth was negligible during water restriction. Experimental results show that the water matric potential reached a minimal value of-58 kPa during water restrictions. Results also reveal that peat water retention increased along time with root growth due to peat macroporosity decrease and microporosity increase. Simulations show that HYDRUS reproduces accurately the water-restricted plant transpira-tion for a given week and therefore gives promising results. However, even if formalisms have been validated, it appears that parameters are not steady during plant growth, suggesting the actual limit of soil-plant water balance models. Thus, peat hydraulic properties and root water uptake changes need to be modeled. Future works is needed to increase the simulation of the growth-dependent water-restricted plant transpiration and to take into account the spatial root distribution. Moreover, in order to get a complete growing media-plant-greenhouse climate model, the challenge is now to couple the soil-plant model with a plant-climate model under water restriction taking account accurately of the stomatal resistance.
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Communication dans un congrès
International Conference of Agricultural Engineering, Jul 2014, Zurich, Switzerland. Proceedings International Conference of Agricultural Engineering, Zurich, 06-10.07.2014
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Patrice Cannavo, Christophe Migeon, Ngariban Tamtial, Etienne Chantoiseau, Sylvain Charpentier, et al.. Modelling soil-plant-atmosphere water transfer in greenhouse cultivation, under water restriction: how does plant growth affects transpiration and soil hydrodynamic properties?. International Conference of Agricultural Engineering, Jul 2014, Zurich, Switzerland. Proceedings International Conference of Agricultural Engineering, Zurich, 06-10.07.2014. 〈hal-01705940〉

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