MODELLING OF WATER POTENTIAL AND WATER UPTAKE RATE OF GREENHOUSE TOMATO PLANTS

L.G.G. Batta
Crop growth and fruit quality of greenhouse tomato plants grown in soilless culture can be improved by changes in the concentration of the nutrient solution (EC). To use this possibility a control of the EC is necessary. For this purpose a model which predicts water potential and water uptake rate of greenhouse tomato plants would be convenient. Such a model could be incorporated in an algorithm to control the EC.

The dynamic model presented in this paper uses transpiration rate as input. Compared to the values measured with the pressure chamber the level of the water potential is predicted reasonably well. It is shown that it is not possible to measure the dynamic behaviour of the water potential with the pressure chamber. Therefore a device is needed that measures water potential continuously and non-destructively. None of the available devices is suitable for this purpose.

Batta, L.G.G. (1989). MODELLING OF WATER POTENTIAL AND WATER UPTAKE RATE OF GREENHOUSE TOMATO PLANTS. Acta Hortic. 248, 355-360
DOI: 10.17660/ActaHortic.1989.248.44
https://doi.org/10.17660/ActaHortic.1989.248.44

Acta Horticulturae