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. Pereira50
Estimated H-index: 50
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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References57
Published on Aug 1, 2013in Journal of Integrative Agriculture 1.04
Jie Li1
Estimated H-index: 1
(Nankai University),
Sha Jiang1
Estimated H-index: 1
(Nankai University)
+ 4 AuthorsSong Gu1
Estimated H-index: 1
(Nankai University)
Abstract To understand the water and energy exchange on the Qinghai-Tibetan Plateau, we explored the characteristics of evapotranspiration (ET) and energy fluxes from 2002 to 2005 over a Kobresia meadow ecosystem using the eddy covariance method. The ratio of annual ET to precipitation (P) of meadow ecosystem was about 60%, but varied greatly with the change of season from summer to winter. The annual ET/P in meadow was lower than that in shrub, steppe and wetland ecosystems of this plateau. The...
6 Citations Source Cite
Published on Dec 1, 2015in Industrial Crops and Products 3.85
María Fandiño6
Estimated H-index: 6
(University of Santiago de Compostela),
J.L. Olmedo1
Estimated H-index: 1
+ 6 AuthorsLuis S. Pereira50
Estimated H-index: 50
(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. Pereira50
Estimated H-index: 50
,
Paula Paredes18
Estimated H-index: 18
+ 1 AuthorsM. Manuela Neves4
Estimated H-index: 4
(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...
30 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. Pereira50
Estimated H-index: 50
(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 Apr 1, 2014in Ecohydrology 2.75
Pei Wang8
Estimated H-index: 8
(University of Tsukuba),
Tsutomu Yamanaka18
Estimated H-index: 18
(University of Tsukuba)
Partitioning of evapotranspiration (ET) into soil evaporation and vegetation transpiration (T) is important for predicting the response of ecosystem water/energy budgets to climatic change. In this study, a new two-source model of water and energy fluxes was developed and used to partition ET for a temperate–grassland ecosystem in central Japan, throughout a growing season. The Newton–Raphson iteration scheme was employed to solve the equations governing the energy balance at the canopy and the ...
20 Citations Source Cite
Published on Mar 1, 2011in Agricultural Water Management 3.18
J.S. Neal2
Estimated H-index: 2
(University of Sydney),
W.J. Fulkerson2
Estimated H-index: 2
(University of Sydney),
R.B. Hacker2
Estimated H-index: 2
The increasing cost and scarcity of water for irrigation is placing pressure on Australian dairy farmers to utilize water more efficiently, and as result, water use efficiency (WUE) of forages is becoming an important criterion for sustainable dairy production. This study was conducted to identify more water use efficient forage species than the dominant dairy forage, perennial ryegrass (Lolium perenne L.). Seventeen annual forage species were investigated under optimum irrigation (I1) and two d...
27 Citations Source Cite
Published on Jan 1, 2012in Agricultural Water Management 3.18
Ricardo D. Rosa6
Estimated H-index: 6
(Technical University of Lisbon),
Paula Paredes18
Estimated H-index: 18
(Technical University of Lisbon)
+ 4 AuthorsRichard G. Allen46
Estimated H-index: 46
(University of Idaho)
Abstract Irrigation planning and scheduling require the availability of modeling tools that are accurate, quick and easy to use. The crop coefficient ( K c )-reference evapotranspiration (ET) method is a traditional method for estimating ET, but has become relatively complicated with the introduction of the dual K c procedure. The dual crop coefficient approach ( K cb + K e ) gives a better estimation of daily crop evapotranspiration because it separately considers soil evaporation and crop tran...
77 Citations Source Cite
Published on Jan 1, 2013in Agricultural Water Management 3.18
Nana Zhao2
Estimated H-index: 2
,
Yu Liu10
Estimated H-index: 10
+ 3 AuthorsLuis S. Pereira50
Estimated H-index: 50
(Technical University of Lisbon)
The dual crop coefficient (Kc) approach to estimate crop evapotranspiration (ETc) separately considers soil evaporation (E) and plant transpiration (T) by computing a soil evaporation coefficient (Ke) and a basal crop coefficient (Kcb), respectively, with Kc=Ke+Kcb. This approach may be more precise than the single Kc approach particularly when the crops incompletely cover the ground. The SIMDualKc model, which is adopted in this study, is an irrigation scheduling simulation model that uses a da...
64 Citations Source Cite
Published on May 1, 2009in Agricultural Water Management 3.18
K.L. Greenwood1
Estimated H-index: 1
,
A.R. Lawson1
Estimated H-index: 1
,
K.B. Kelly1
Estimated H-index: 1
Knowledge of the components of the water balance - evaporation, transpiration and deep drainage - would be beneficial for targeting productivity improvements for irrigated forages in northern Victoria. We aimed to estimate these components using a simple water balance and the dual crop coefficients provided in FAO-56. Soil water deficits from a field experiment, comparing the water use of six border-check and one spray irrigated forage system, agreed well with the modelled values, except for alf...
23 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. Dukes26
Estimated H-index: 26
(University of Florida)
+ 2 AuthorsThomas R. Sinclair57
Estimated H-index: 57
(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
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