ISHS Acta Horticulturae 174: Symposium Greenhouse Climate and its Control
DISCUSSION OF POSTERGROUP A: MICROCLIMATE, PHYSICAL PROCESSES AND GREENHOUSE TECHNOLOGY |
| Authors: | M.G. Amsen, N.J. van de Braak |
| Abstract:
The first item of discussion concerned the heat and mass transfer at the surface of the leaves of the greenhouse crop. A question of interest with respect to the research on evaporation and transpiration appeared to be whether the internal or external resistance is the most important. If during the daytime the leaf resistance would be negligible this would be important for the modelling of carbondioxide exchange, as this would be different from the open field situation. No general answer could be given. In fact the problem is whether the control of waterlosses and assimilation is governed by internal or external factors, i.e. to which extent is it a consequence of the microclimate. Another remark concerning CO2 exchange was that when comparing experimental results, one should be aware that local pressures have influence on the amount of CO2 present at a given concentration. | |
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