CROP TRANSPIRATION: A GREENHOUSE CLIMATE CONTROL PARAMETER

C. Stanghellini, W.Th.M. van Meurs
This article describes an approach to transpiration control through environmental management. It is based on a model for greenhouse crop transpiration where transpiration is estimated from the effects of the microclimate on the canopy. In this particular instance the microclimate is determined by the temperature and humidity of the air surrounding the canopy and the amount of incoming global radiation. The canopy itself is totally defined by the efficiency with which is able to exchange energy (whether sensible, latent, or radiative). This simple model is able to estimate the transpiration rate of a real greenhouse crop at particular time intervals and with an acceptable accuracy.

It follows then that if a "transpiration set-point" and the quantity of incoming radiation are assumed as given, the transpiration model can be reversed in order to yield a number of combinations of air temperature and humidity which could cause the desired transpiration rate. It is suggested that such an approach can improve the effectiveness of present humidity control procedures and increases the possibility of directly managing plant processes through greenhouse climate control.

Stanghellini, C. and van Meurs, W.Th.M. (1989). CROP TRANSPIRATION: A GREENHOUSE CLIMATE CONTROL PARAMETER. Acta Hortic. 245, 384-388
DOI: 10.17660/ActaHortic.1989.245.51
https://doi.org/10.17660/ActaHortic.1989.245.51

Acta Horticulturae