Co-Authors:
Seginer, I., Department of Agricultural Engineering, Technion, Haifa, 32000, Israel
Kantz, D., Department of Agricultural Engineering, Technion, Haifa, 32000, Israel
Levav, N., Institute of Agricultural Engineering, ARO, Bet-Dagan, 50250, Israel
Peiper, U.M., Institute of Agricultural Engineering, ARO, Bet-Dagan, 50250, Israel
Abstract:
High night-time humidity in greenhouses is characteristic of well insulated houses in mild weather. Using ventilation to remove excess vapour increases the energy requirement of a greenhouse in direct proportion to the amount of vapour to be removed which, in turn, increases linearly with canopy conductance. The night-time transpiration of several greenhouse crops was measured and their leaf conductance and resistance to vapour flux were determined by two methods: a weighing method was used for individual containers and a vapour balance method for a whole compartment. A few night-long comparisons between the two methods gave good agreement. A wide range of leaf resistances was obtained, from 500 to 2000 s m-1 for vegetables, from 2000 to 5000 s m-1 for most foliage and flower plants, with one crop reaching 20 000 s m-1. © 1990.
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