Effects of prolonged water restriction on plant interactions with their environment - the case of potted ornamental crops grown in greenhouses
In greenhouses, reducing water consumption by increasing water efficiency is of great interest in order to limit the environmental footprint of cultivation and reduce costs. However, satisfactory irrigation is needed to get plants of a good quality. When reducing water inputs, if the quality decreases because of visible physical adaptations, these are coupled to physiological adaptations that limit water losses by transpiration. Understanding these adaptations is therefore required in order to model and thus forecast plant transpiration in the scope of precision horticulture. For this purpose, an experiment was conducted to understand the effect of prolonged restricted irrigation on potted New Guinea impatiens. Plants were grown inside a 100-m2 greenhouse compartment. They were distributed on four shelves, irrigated with different amounts of water from 6 weeks after repotting. Irrigation was maintained at 25, 50, 75 and 100% of the effective transpiration of the most irrigated shelf. Transpiration of plants was monitored continuously on each shelf, as well as the climatic conditions and substrate properties until the end of cultivation at the 16th week. Plant transpiration was also simulated using a soil-plant-atmosphere model in order to account for the strong link between the climatic conditions and stomatal resistance, but also for the influence of substrate matric potential on stomatal resistance. This model provided good results to simulate plant transpiration under deficit irrigation.
Chantoiseau, E., Bouhoun Ali, H., Bournet, P.E. and Cannavo, P. (2018). Effects of prolonged water restriction on plant interactions with their environment - the case of potted ornamental crops grown in greenhouses. Acta Hortic. 1227, 273-282
irrigation, water restriction, New Guinea impatiens, transpiration, stomatal conductance