ISHS Acta Horticulturae 278: Symposium on Scheduling of Irrigation for Vegetable Crops under Field Condition
RELATIVE EVAPOTRANSPIRATION IN RELATION TO SOIL WATER DEFICIT AND PREDAWN LEAF WATER POTENTIAL - APPLICATION TO TOMATO CROP - |
| Authors: | B. Itier, N. Katerji, D. Flura, I. Ferreira |
| Abstract:
An experiment was conducted on tomato during the summers of 1985 and 1986 to determine relative evapotranspiration evolution with decreasing soil water availability. It took place at Coruche (Portugal) on sandy soil in the Soraya Valley. AET measurements were performed throughout the day by means of automatic systems (SAMER) using the aerodynamic combined method. Relative evapotranspiration is given versus soil water consumption for 6 drying cycles during July 1985 and July and August 1986. Results concerning the relation of relative evapotranspiration to percentage of soil availability differ from those published by others workers. As to its relationship to leaf water potential, results are very close to those resulting from works on other crops and soils. This differs from the great dispersion of curves relating relative ET to soil water potential. Thus, leaf predawn potential could be used as well as radiative CWSI as a criterium for irrigation scheduling. | |
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