Abstract

ABSTRACT A theoretical model of greenhouse microclimate was developed for describing heat and mass transport processes in a greenhouse row-crop stand, including radiation transfer, energy balance, transpiration and CO2 exchange. The canopy was described as a series of parallel rows with pseudo-rectangular cross-sections and variable architectural parameters. Radiation transfer, convective transport processes, and plant responses to environmental factors were formulated as functions of plant architecture, greenhouse structure and state variables of bulk air above the canopy. Each of the individual submodels was parameterized from experimental data for a dense row cucumber crop. The general theoretical considerations were assembled into a dynamic simulator by applying energy and mass balances simultaneously over differential strata of plant leaves and greenhouse air. Outputs of the simulator included both diurnal courses and vertical profiles of leaf temperature, air temperature, humidity and CO2 concentration in addition to energy and mass exchange.

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