Microclimate and transpiration of a greenhouse banana crop

The interactions between a greenhouse banana crop and the surrounding environment were investigated within a large-scale type of greenhouse. This investigation took place through a whole development cycle of a mature banana crop in the region of Rabat, Morocco. Two measurement series are presented: the first from 4 to 9 March 1998 is representative of the Spring and Autumn conditions; the second which extends from 6 to 26 July 1999 is representative of the Summer period. Space- and time-dependent air evolution (the evolution of air temperature in time (time course) and space (vertically at trees levels in the greenhouse)) leaf temperature and air humidity were analysed, and evidence was provided for the significant oasis effect generated by the crop in the greenhouse. In addition, leaf area and stomatal resistance measurements are analysed and discussed. With regard to the function of microclimate-dependent parameters, a model of leaf stomatal resistance was additionally defined and developed. The transpiration model of the banana crop under cover was validated with respect to the estimated rates of heat and mass transfer implied from indoor and outdoor climatic measurements.