COMPARATIVE MEASUREMENTS OF FAN AND PAD COOLING AND PLANT WETTING

Nowadays for several crops it is necessary to program cultivation cycles the year round.
A Primary requirement is thus to control the greenhouse climate the whole year round.
During long periods with high levels of radiation in the warmer season, difficulties appear due to excessive transpiration.
Using two systems, namely fan-and-pad cooling and plant wetting, we attempted to determine how far transpiration could be reduced.

This research was carried out in a two-compartment greenhouse especially built for this study, and planted with a rose crop (cv.Sonia). In addition to measurements of climate, simultaneous measurements were also made of soil evaporation, transpiration of a single plant with a lysimeter (C.J. v.d.
Post, ITT) leaf thickness and water potential (P.A.M. Hopmans L.H.). Figures 1, 2, and 3 show the greenhouse block, the ground plan and the position of the instrumentation.

Symposium on Greenhouse Design and Environment

P.A. Spoelstra

https://doi.org/10.17660/ActaHortic.1975.46.3