ISHS Acta Horticulturae 537: III International Symposium on Irrigation of Horticultural Crops
ANALYSIS OF THE PRIESTLEY-TAYLOR ALPHA PARAMETER FOR A BEAN CROP |
| Authors: | A. Garcia, R.G.B. André |
| Keywords: | Energy balance, Phaseolus vulgaris (L.), equilibrium rate, Bowen ratio |
| Abstract:
This work deals with the Priestley-Taylor model for evapotranspiration in different grown stages of a bean crop. Priestley and Taylor derived a practical formulation for energy partitioning between the sensible and latent heat fluxes through the a parameter. Bowen ratio energy balance (BREB) was carried out for daily sensible and latent heat flux estimations in three different crop stages. Mean daily values of Priestley-Taylor  parameter were determined for eleven days during the crop cycle.
Diurnal variation patterns of a are presented for the growing, flowering and graining periods.
The mean values of 1.13 ± 0.33, 1.26 ± 0.74, 1.22 ± 0.55 were obtained for a day in the growing, in the flowering and for graining periods, respectively.
Eleven days values of are shown and gave a mean value of 1.23 ± 0.10 which agree on the reported literature.
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