Assessing Olive Evapotranspiration Partitioning from Soil Water Balance and Radiometric Soil and Canopy Temperatures

Santos, Francisco L.

doi:10.3390/agronomy8040043

Cited by 4 publications

(5 citation statements)

References 44 publications

(55 reference statements)

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“…The initial value for Kc-ini, Kc-mid, and Kc-end in W5 was 1.00, 1.33, and 1.09, and the calibrated value was correspondingly 1.00, 1.30, and 0.89, respectively (Table 3). The initial Ze, TEW, and REW was 0.15 m, 30 mm, and 10 mm, respectively, and the calibrated value was 0.10 m, 21 mm, and 8 mm (Table 3), which is similar to the results of Paço et al [15] and Santos [38]. For the soil of sandy loam in the south in the Mediterranean region, Paço et al [15] showed the value of Ze, TEW, and REW was 0.10 m, 18 mm, and 9 mm, respectively.…”

Section: Simdualkc Model Parameterization and Calibrationsupporting

confidence: 86%

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Evapotranspiration Partition and Dual Crop Coefficients in Apple Orchard with Dwarf Stocks and Dense Planting in Arid Region, Aksu Oasis, Southern Xinjiang

Cao

Wang

et al. 2021

Agriculture

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Crop coefficients are critical to developing irrigation scheduling and improving agricultural water management in farmland ecosystems. Interest in dwarf cultivation with high density (DCHD) for apple production increases in Aksu oasis, southern Xinjiang. The lack of micro-irrigation scheduling limits apple yield and water productivity of the DCHD-cultivated orchard. A two-year experiment with the DCHD-cultivated apple (Malus × domestica ‘Royal Gala’) orchard was conducted to determine crop coefficients and evapotranspiration (ETa) with the SIMDualKc model, and to investigate apple yield and water productivity (WP) in response to different irrigation scheduling. The five levels of irrigation rate were designed as W1 of 13.5 mm, W2 of 18.0 mm, W3 of 22.5 mm, W4 of 27.0 mm, and W5 of 31.5 mm. The mean value of basal crop coefficient (Kcb) at the initial-, mid-, and late-season was 1.00, 1.30, and 0.89, respectively. The Kc-local (ETa/ET0) range for apple orchard with DCHD was 1.11–1.20, 1.33–1.43, and 1.09–1.22 at the initial, middle, and late season, respectively. ETa of apple orchard in this study ranged between 415.55–989.71 mm, and soil evaporation accounted for 13.85–29.97% of ETa. Relationships between total irrigation amount and apple yield and WP were developed, and W3 was suggested as an optimum irrigation schedule with an average apple yield of 30,540.8 kg/ha and WP of 4.45 kg/m3 in 2019–2020. The results have implications in developing irrigation schedules and improving water management for apple production in arid regions.

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Section: Simdualkc Model Parameterization and Calibrationsupporting

confidence: 86%

“…For the soil of sandy loam in the south in the Mediterranean region, Paço et al [15] showed the value of Ze, TEW, and REW was 0.10 m, 18 mm, and 9 mm, respectively. Santos [38] reported that the value of Ze, TEW, and REW in sandy loam was 0.10 m, 22 mm, and 8 mm, respectively.…”

Section: Simdualkc Model Parameterization and Calibrationmentioning

confidence: 98%

Evapotranspiration Partition and Dual Crop Coefficients in Apple Orchard with Dwarf Stocks and Dense Planting in Arid Region, Aksu Oasis, Southern Xinjiang

Cao

Wang

et al. 2021

Agriculture

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“…Although information on crop evapotranspiration can be obtained through using various field measurements techniques [14], those involving direct measurements of ET are generally expensive, labour consuming, require appropriate skills of users and are more appropriate for research, that is, for example, measurements of soil water content [15,16], sap-flow [17][18][19] and eddy covariance [18][19][20], which are applied in this study. Differently, crop ET modelling, using commonly observed meteorological data [4], radiometric canopy temperature [21,22], web based sensors networks [23] and remote sensing information [24][25][26][27][28], including using unmanned aerial vehicles [29] might be useful irrigation management tools, namely for irrigation scheduling purposes and to generate mitigation scenarios to face drought and climate change. Example of models applications to olive orchards include WABOL [30], SIMDualKc [19] and HYDRUS 2D [31].…”

Section: Introductionmentioning

confidence: 99%

Crop Coefficients and Transpiration of a Super Intensive Arbequina Olive Orchard using the Dual Kc Approach and the Kcb Computation with the Fraction of Ground Cover and Height

Paço

Paredes

Pereira

et al. 2019

Water

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The SIMDualKc model was used to simulate crop water requirements for a super high density olive orchard in the region of Alentejo, Portugal. This model uses the dual crop coefficient approach to estimate and partitioning the actual crop evapotranspiration (ETc act) and therefore to perform the soil water balance. The model was calibrated with 2011 tree transpiration using trunk sap flow measurements and was validated using similar data from 2012 and tested with 2013 data. Low root mean square errors (RMSE < 0.53 mm·d−1) and acceptable modelling efficiency indicators (EF > 0.25) were obtained. Further validation was performed comparing modelled ETc act with eddy covariance measurements. These indicators support the appropriateness of using SIMDualKc to guide irrigation management. The basal crop coefficient (Kcb) curves obtained with SIMDualKc for those 3 years were compared with the Kcb values computed with the Allen and Pereira approach (A&P approach) where Kcb is estimated from the fraction of ground cover and plant height considering an adjustment factor for crop stomatal control (Fr). Fr values were obtained through a trial and error procedure through comparing the Kcb estimated with this approach and with SIMDualKc. The Kcb curves obtained by both methods resulted highly correlated, which indicates that the A&P approach may be used in the irrigation management practice to estimate crop water requirements. Results of performing the soil water balance with SIMDualKc have shown that soil evaporation is a large fraction of ETc act, varying between 41% and 45% for the 3 years under study. Irrigation, applied with a drip system, represented 39 to 56% of ETc act, which shows the great importance of irrigation to achieve the water requirements of super intensive olive orchards. Nevertheless, the analysis has shown that the irrigation management adopted at the orchard produces a water deficit larger than desirable, with a ratio of ETc act to non-stressed crop evapotranspiration (ETc) varying from 70% to 94% during the mid-season, when that ratio for a eustress irrigation management could be around 90%.

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“…Details on soil water balance equations, adjustments to plant density and height, as well as crop water stress are given in References [17,20]. To calibrate and validate the model [17,20], and support the derivation of olive ET c act and dual K c , the daily sap flow-based T sf data per treatment and year was used, thus comparing T simulated by SIMDualKc (T sim ) with the observed T sf . 70DI sap flow transpiration data (T sf ) from 2013 was used to calibrate the SIMDualKc model and validation was performed with T sf data collected from 70DI in 2014.…”

Section: Et C and Dual K Cmentioning

confidence: 99%

“…A recommended approach for the estimation of IWU and water stress is the dual K c -ET o methodology adopted by FAO56 [16], where for DI strategies the concept of potential crop evapotranspiration (ET c ) are replaced by the ET c (ET c act ), the result of a K c act coefficient derived from a stress coefficient (K s ) and a soil evaporation coefficient K e , i.e., K c act = K s K cb + K e [17][18][19]. The SIMDualKc model [7,20,21] provides such a computational structure [17,18,22]. The implementation of DI strategies also requires knowing the plant water status, preferably determined by plant-based measurement methods [5,21,23].…”

Section: Introductionmentioning

confidence: 99%

Olive Water Use, Crop Coefficient, Yield, and Water Productivity under Two Deficit Irrigation Strategies

Santos

2018

Agronomy

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Reports on the annual effects of deficit irrigation regimes on olive trees are critical in shedding light on their impacts on water use, yield, and water productivity in distinct olive growing climate regions of the world. From the account of a four-year experiment, the aim of this work is to add insight into such effects on olive growing in southern Portugal. We worked with trees in an intensive 'Cobrançosa' orchard (300 trees ha −1) under full irrigation (FI) treatment and two regulated deficit irrigation (DI) treatments designed to replace around 70% and 50% of the FI water supply, respectively. Crop transpiration (T), irrigation water use (IWU), total water use (TWU), irrigation water use efficiency (IWUE), yield (Y a), and water productivity (WP) obtained from all treatments were analyzed, as well as their crop coefficients (K c), simulated with the SIMDualKc software application for root zone and soil water balance based on the FAO dual crop coefficients. As expected, IWUE of the 50DI treatment was the highest among treatments, with 70DI being slightly lower. Y a showed alternate bearing with an "on-off" year sequence and was consistently higher for the 70DI treatment. WP (the ratio of Y a to IWU) values for the 70DI treatment were also consistently the highest among all treatments and years. The mean simulated K c act values for 70DI and 50DI for the initial, mid-, and end-season compared well to the FAO56 K c for olive crops. In general, to rank the irrigation treatments, 70DI presented the highest conversion efficiency among all treatments and years, providing a suitable DI alternative for our 'Cobrançosa' orchard. The 50DI treatment may be an attractive DI regime to undertake under scarce farm water resources or the expansion of olive hectares under water constraints.

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Assessing Olive Evapotranspiration Partitioning from Soil Water Balance and Radiometric Soil and Canopy Temperatures

Cited by 4 publications

References 44 publications

Evapotranspiration Partition and Dual Crop Coefficients in Apple Orchard with Dwarf Stocks and Dense Planting in Arid Region, Aksu Oasis, Southern Xinjiang

Evapotranspiration Partition and Dual Crop Coefficients in Apple Orchard with Dwarf Stocks and Dense Planting in Arid Region, Aksu Oasis, Southern Xinjiang

Crop Coefficients and Transpiration of a Super Intensive Arbequina Olive Orchard using the Dual Kc Approach and the Kcb Computation with the Fraction of Ground Cover and Height

Olive Water Use, Crop Coefficient, Yield, and Water Productivity under Two Deficit Irrigation Strategies

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