6533b82afe1ef96bd128b835
RESEARCH PRODUCT
Transpiration and Water Use of an Irrigated Traditional Olive Grove with Sap-Flow Observations and the FAO56 Dual Crop Coefficient Approach
Mario MinacapilliLuis S. PereiraGiuseppe ProvenzanoPaula ParedesTeresa A. PaçoGiovanni RalloÀNgela Puig-sirerasubject
Actual transpiration; Fraction of ground cover; K; cb; from cover fraction and height; Orchard water balance; Sap flow; Soil evaporation; Standard basal crop coefficientStandard basal crop coefficientFraction of ground coverK<sub>cb</sub> from cover fraction and heightGeography Planning and DevelopmentDeficit irrigationAquatic Sciencefrom cover fraction and heightBiochemistryactual transpirationWater balancesap flowSap flowLinear regressionSettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-Forestalisoil evaporationKcb from cover fraction and heightIrrigation managementTD201-500Water Science and TechnologyTranspirationHydrologyActual transpirationWater supply for domestic and industrial purposesIrrigation schedulingActual transpiration Kcb from cover fraction and height soil evaporation Sap flow water balance Standard basal crop coefficientHydraulic engineeringKcbCrop coefficientfraction of ground coverOrchard water balanceEnvironmental sciencestandard basal crop coefficientTC1-978Soil evaporationWater useorchard water balancedescription
The SIMDualKc model was applied to evaluate the crop water use and the crop coefficient (Kc) of an irrigated olive grove (Olea europaea L.) located in Sicily, Italy, using experimental data collected from two crop seasons. The model applies the FAO56 dual Kc approach to compute the actual crop evapotranspiration (ETc act) and its components, i.e., the actual tree transpiration (Tc act), obtained through the basal crop coefficient (Kcb), and soil evaporation according to an evaporation coefficient (Ke). Model calibration was performed by minimizing the difference between the predicted Tc act and the observed daily tree transpiration measured with sap flow instrumentation (TSF field) acquired in 2009. The validation was performed using the independent data set of sap flow measurements from 2011. The calibrated Kcb was equal to 0.30 for the initial and non-growing season stages, 0.42 for the mid-season, and 0.37 for the end season. For both seasons, the goodness-of-fit indicators relative to comparing TSF field with the simulated Tc act resulted in root mean square errors (RMSE) lower than 0.27 mm d−1 and a slope of the linear regression close to 1.0 (0.94 ≤ b0 ≤ 1.00). The olive grove water balance simulated with SIMDualKc produced a ratio between soil evaporation (Es) and ETc act that averaged 39%. The ratio between actual (ETc act) and potential crop evapotranspiration (ETc) varied from 84% to about 99% in the mid-season, indicating that the values of ETc act are close to ETc, i.e., the adopted deficit irrigation led to limited water stress. The results confirm the suitability of the SIMDualKc model to apply the FAO56 dual Kc approach to tree crops, thus assessing the water use of olives and supporting the development of appropriate irrigation management tools that are usable by farmers. A different way to estimate Kcb is based on the approach suggested in 2009 by Allen and Pereira (A&
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-09-08 |