ISHS Acta Horticulturae 548: International Symposium on Growing Media and Hydroponics
ESTIMATING TRANSPIRATION RATE AND CANOPY RESISTANCE OF A ROSE CROP IN A FAN-VENTILATED GREENHOUSE |
| Authors: | N. Katsoulas, C. Kittas, A. Baille |
| Keywords: | rose crop, glasshouse, transpiration, canopy resistance, soilless culture |
| Abstract:
The influence of solar radiation (G) and saturation deficit (VPDair) of the greenhouse air on transpiration rate, canopy resistance was investigated on a soilless rose crop (cv. First Red), grown on perlite, during the 1998 summer growing period. Measurements of TR, G, Tair, VPDair, Tleaf were carried out in a fan-ventilated glasshouse located in the region of Magnesia on the coastal area of Eastern Greece. Transpiration rate was found to be dependent on solar radiation and VPDair during daytime. A clear diurnal hysteresis of TR vs. VPDair, was evidenced. The above measurements were used for (i) the calibration of a model based on a simplified form of the Penman-Monteith equation: TR=  f1(LAI)G +  f2(LAI)VPDair, and (ii) the determination of a relationship between canopy resistance rc and climate variables.
Application of both models gave satisfactory results.
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