ISHS Acta Horticulturae 278: Symposium on Scheduling of Irrigation for Vegetable Crops under Field Condition
CROP EVAPOTRANSPIRATION MEASURED BY TWO ENERGY BALANCE METHODS UNDER MEDITERRANEAN CLIMATE |
| Authors: | G. Rana, N. Losavio, M. Mastrorilli, M.E. Venezian |
| Abstract:
The aim of this study is to assess the validity of two indirect methods (Bowen ratio and aerodynamic models) in predicting soybean crop water requirements under Mediterranean conditions. The trial was carried out during the dry summer of 1988 in Southern Italy (Rutigliano-Bari) on a soybean crop (cv. Hodgson) grown in well watered conditions. Micrometeorological parameters were recorded by a data-logger every two minutes and the 15-minute averages were stored and utilized as inputs to the micrometeorological methods. The hourly ET flux of the ryegrass crop determined by Bowen ratio and simplified aerodynamic methods were compared to ETr mesured by a weighing lysimeter during the same period and a good correlation between them was observed. The Kc values (Kc=ET/ETr) of the seed ripening stage of the soybean observed in Mediterranean climate seem to be higher (0.8) than those reported by the F.A.O. (0.5). The results of this study reveal that irrigation scheduling can be approached by micrometeorological methods if boundary conditions are properly defined. | |
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