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Evapotranspiration Partition and Crop Coefficients of Tifton 85 Bermudagrass as Affected by the Frequency of Cuttings. Application of the FAO56 Dual Kc Model

Published on Apr 26, 2018in Water 2.07
· DOI :10.3390/w10050558
Paula Paredes18
Estimated H-index: 18
,
G. Rodrigues1
Estimated H-index: 1
+ 3 AuthorsLuis S. Pereira51
Estimated H-index: 51
Abstract
This study aims to model the impacts of the frequency of cuttings of Tifton 85 bermudagrass on the dynamics of evapotranspiration (ETc) and to derive crop coefficients appropriate for grass water management. Two seasons of experimentation were used with four different cutting treatments which provided field data for calibration and validation of the soil water balance model SIMDualKc for all treatments. Cuttings were performed after the cumulative growth degree days (CGDD) attained 124 °C, 248 °C and 372 °C, thus from short to very long intervals between cuttings. SIMDualKc adopts the Food and Agriculture Organization (FAO) dual Kc approach for partitioning ET into crop transpiration and soil evaporation, thus providing for an assessment of their dynamics. All treatments were irrigated to avoid water stress. Grass ETc was modelled adopting a Kcb curve to describe the ET variation for each cutting cycle, that is, using the FAO Kc curve that consists of a series of Kcb curves relative to each cutting cycle. Each individual Kcb curve consisted of three segments constructed when knowing the Kcb values at the initial, at the end of rapid growth, and at cutting, respectively Kcb ini, Kcb gro and Kcb cut. These Kcb values were first estimated using the equation relating Kcb to the density coefficient (Kd), which is computed from the fraction of ground cover (fc) and canopy height (h) at the same dates. The goodness of fit indicators relative to the calibration and validation of the SIMDualKc model were rather good, with the normalized root mean square error (RMSE) ranging from 4.0% to 6.7% of the mean available soil water. As an example, the standard Kcb values obtained after model calibration relative to the cuttings treatment with CGDD of 248 °C are: Kcb ini = 0.86, Kcb gro = 0.91 and Kcb cut = 0.96. Kcb values were smaller when the frequency of cuts was larger because h and fc were smaller, and were larger for reduced cuttings frequency since h and fc were then larger. Because the soil was wet most of the time, the soil evaporation Ke varied little but its value was small due to the combined effects of the fraction of crop cover and plant litter covering the soil. The values of Kc = Kcb+Ke also varied little due to the influence of Ke and the Kc curve obtained a form different from the Kcb curves, and a single Kc value was adopted for each cutting frequency, e.g., Kc = 0.99 for the treatment with CGDD of 248 °C. Results of the soil water balance have shown that, during the experimental periods, likely due to the effects of the El Nino Southern Oscillation (ENSO), runoff and deep percolation exceeded ETc. Moreover, the soil evaporation ratio was small: 14% in case of frequent cuttings and less for more spaced cuttings, thus with a transpiration ratio close to 90%, which indicates a very high beneficial consumptive water use, mainly when cuttings are not very frequent.
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Published on Nov 1, 2016in Agricultural Water Management 3.18
Scott L. Graham3
Estimated H-index: 3
(National Institute of Water and Atmospheric Research),
John Kochendorfer11
Estimated H-index: 11
(Oak Ridge National Laboratory)
+ 3 AuthorsGladys Hertzog1
Estimated H-index: 1
(École Polytechnique Fédérale de Lausanne)
Irrigation is an important component of the hydrologic cycle in agricultural ecosystems, affecting both quantity and quality of surface and ground water. Well-managed irrigation involves balancing irrigation with water consumption by evaporation and transpiration (collectively evapotranspiration), maximizing ecosystem water-use efficiency and minimizing drainage. Here we compare rates of actual crop evapotranspiration (ETC) measured by eddy covariance with reference evapotranspiration (ET0) calc...
5 Citations Source Cite
Published on Sep 1, 2016in Ecohydrology 2.75
Yao Wu2
Estimated H-index: 2
(Inner Mongolia Agricultural University),
Tingxi Liu7
Estimated H-index: 7
(Inner Mongolia Agricultural University)
+ 4 AuthorsLuis S. Pereira51
Estimated H-index: 51
(University of Lisbon)
The Horqin sandy steppe is an ecosystem where groundwater-dependent grasslands are main components. To study the dynamics of soil water and evapotranspiration, and its partition into transpiration and soil evaporation, the SIMDualKc model was applied to two sites in the Agula eco-hydrological study area, Inner Mongolia, China. This model adopts the dual crop coefficient approach to compute daily crop evapotranspiration (ETc) and uses a parametric function to compute capillary rise from a shallow...
4 Citations Source Cite
Published on Sep 1, 2016in Agriculture, Ecosystems & Environment 3.54
J. Pronger5
Estimated H-index: 5
(University of Waikato),
David I. Campbell23
Estimated H-index: 23
(University of Waikato)
+ 3 AuthorsLouis A. Schipper43
Estimated H-index: 43
(University of Waikato)
Abstract Ecosystem scale measurements of evaporation ( E ) from intensively managed pasture systems are important for informing water resource decision making and validation of hydrologic models and remote sensing methods. We measured E from a year round intensively grazed temperate pasture system in New Zealand using the eddy covariance method for three years (2012⿿2014). Evaporation varied by less than 3% both spatially (770⿿783 mm) and temporally (759⿿776 mm) at an annual scale. The low spati...
8 Citations Source Cite
Published on Dec 1, 2015in Industrial Crops and Products 3.85
M. Fandiño6
Estimated H-index: 6
(University of Santiago de Compostela),
J.L. Olmedo1
Estimated H-index: 1
+ 6 AuthorsLuis S. Pereira51
Estimated H-index: 51
(University of Lisbon)
Abstract This study was conducted during three seasons (2012–2014) in an experimental hop yard at Mabegondo, Galicia, NW Spain. The research aimed at calibrating and validating the soil water balance model SIMDualKc for Humulus lupulus L. cv. ‘Nugget’. The model computes the soil water balance using the dual K c approach, thus partitioning crop evapotranspiration (ET c ) into crop transpiration, ground cover transpiration and soil evaporation. Calibration and validation were performed using TDR ...
10 Citations Source Cite
Published on Sep 1, 2015in Agricultural Water Management 3.18
Luis S. Pereira51
Estimated H-index: 51
,
Paula Paredes18
Estimated H-index: 18
+ 1 AuthorsM. Manuela Neves5
Estimated H-index: 5
(University of Lisbon)
Two contrasting rainfall barley seasons, dry (2012) and wet (2013), were used to parameterize and assess the performance of the SIMDualKc and AquaCrop models. Field data were obtained from malt barley cropped in a farmer’s field in Ribatejo, Portugal. SIMDualKc applies the dual crop coefficient approach for computing and partitioning crop evapotranspiration (ET), while AquaCrop uses an empirical approach to estimate potential crop transpiration (Tc) and soil evaporation (Es) depending upon the c...
33 Citations Source Cite
Published on Jul 1, 2015in Agricultural Water Management 3.18
Benjamin G. Wherley8
Estimated H-index: 8
(Texas A&M University),
Michael D. Dukes27
Estimated H-index: 27
(University of Florida)
+ 2 AuthorsThomas R. Sinclair60
Estimated H-index: 60
(North Carolina State University)
Increased urban demand for landscape irrigation, as well as interest in promoting water-use efficient species by municipalities, water purveyors, and homeowners associations emphasize the need for comparative data on consumptive water use by warm-season lawn grasses. The objective of this study was to quantify actual evapotranspiration (ETa) and to develop crop coefficients (Kc) for four warm-season turfgrass species, namely ‘Tifway’ bermudagrass (Cynodon dactylon (L.) Pers. x Cynodon transvaale...
9 Citations Source Cite
Published on Jan 1, 2015in Agricultural Water Management 3.18
Zheng Wei1
Estimated H-index: 1
,
Paula Paredes18
Estimated H-index: 18
(University of Lisbon)
+ 2 AuthorsLuis S. Pereira51
Estimated H-index: 51
(University of Lisbon)
The main objectives of this study were to assess and partition soybean evapotranspiration and modelling to predict yields. The SIMDualKc water balance model, that adopts the dual crop coefficient approach, was used to evaluate the transpiration and soil evaporation components. Transpiration estimates were then used with the Stewart's water-yield model to predict soybean yields. SIMDualKc was calibrated and validated using soil water observations relative to four crop seasons and six treatments. ...
43 Citations Source Cite
Published on Jan 1, 2015in Agronomy Journal 1.90
Diego N. L. Pequeno3
Estimated H-index: 3
(University of Florida),
Carlos Guilherme Silveira Pedreira20
Estimated H-index: 20
(University of São Paulo)
+ 2 AuthorsLiliane S. Silva3
Estimated H-index: 3
(University of São Paulo)
13 Citations Source Cite
Published on Jan 1, 2015in Crop Science 1.64
Valdson J. Silva3
Estimated H-index: 3
(University of São Paulo),
Carlos Guilherme Silveira Pedreira20
Estimated H-index: 20
(University of São Paulo)
+ 3 AuthorsDebora C. Basto2
Estimated H-index: 2
(University of São Paulo)
8 Citations Source Cite
Published on Jan 1, 2015in Agricultural Water Management 3.18
Michael Krauß3
Estimated H-index: 3
(Leibniz Association),
Simone Kraatz6
Estimated H-index: 6
(Leibniz Association)
+ 1 AuthorsAnnette Prochnow10
Estimated H-index: 10
(Humboldt University of Berlin)
Livestock production is the main user of water resources in agricultural production. The objective of this study is to quantify the effects of dairy management strategies such as feeding strategies, milk yield and replacement rate on the water productivity of milk. The study is based on site conditions of North-East Germany. The water input is considered as the sum of crop transpiration from precipitation, the total irrigation water and the drinking water of the animals. Four feeding strategies,...
10 Citations Source Cite