Comparing Turfgrass Cumulative Evapotranspiration Curves

Fernandez, George; Love, B. E.

doi:10.21273/hortsci.28.7.732

Cited by 14 publications

(20 citation statements)

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“…In terms of overall ET assessment using remote sensing, the subirrigated meadow displays characteristics that are similar to the range defined by Fernandez and Love (1993) for well-watered C 3 Poa pretensis (Kentucky bluegrass) equal to 2.5-7.5 mm day −1 (ET r 0 10.6 mm day −1 on May 5). The subirrigated meadow and another nearby subirrigated meadow displayed a range of 1.6-9.5 mm day −1 (Table 7), with an average ET of 5.6 mm day −1 in the array based calculation as described in sec.…”

Section: Resultsmentioning

confidence: 83%

Remote sensing and in situ-based estimates of evapotranspiration for subirrigated meadow, dry valley, and upland dune ecosystems in the semi-arid sand hills of Nebraska, USA

Healey

Irmak

Arkebauer

et al. 2011

Irrig Drainage Syst

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Water consumed through evapotranspiration (ET) impacts local and regional hydrologic regimes on various spatial and temporal scales. Estimating ET in the Great Plains is a prerequisite for effective regional water resource management of the Ogallala (High Plains) Aquifer, which supplies vital water resources in the form of irrigation for Irrig Drainage Syst (2011) 25:151-178 extensive agricultural production. The Sand Hills region of Nebraska is one of the largest grass-stabilized eolian (windblown) sand dune formations in the world, with an area of roughly 50,000-60,000 km 2 that supports a system of five major land cover types: (1) lakes, (2) wetlands (with lakes,~5%), (3) subirrigated meadows (water table is within~1 m of surface;~10%), (4) dry valleys (water table is 1-10 m below surface;~20%), and (5) upland dunes (water table is more than 10 m below surface;~65%). Fully understanding the hydrologic regime of these different ecosystems is a fundamental challenge in regional water resource assessment. The surface energy and water balances were analyzed using Bowen Ratio Energy Balance Systems (BREBS) at three locations: (1) a meadow, (2) a valley, and (3) an upland dune. Measurement of the energy budget by BREBS, in concert with Landsat remote sensing image processing for 2004 reveals strong spatial gradients between sites in latent heat flux that are associated with undulating topographic relief. We find that daily estimates of ET from BREBS measurements and remote sensing agree well, with an uncertainty within 1 mm, which is encouraging when applying remote sensing results across such a broad spatial scale and undulating topography. Abbreviations GSRLGudmundsen sand hills research laboratory AWDN Automated weather data network BREBS Bowen ration energy balance system BREBS-Meadow Bowen ration energy balance system at the subirrigated meadow ecosystem BREBS-ValleyBowen ration energy balance system at the dry valley ecosystem BREBS-Upland Bowen ration energy balance system at the upland dune ecosystem R n Net radiation (Wm −2 ) H Sensible heat flux (Wm −2 ) λE Latent heat flux (Wm −2 ) G Soil heat flux (Wm −2 ) Β Bowen ratio (unitless) GDD Growing degree days (°C) ET Actual evapotranspiration (mm day −1 ) ET r Reference evapotranspiration for alfalfa (mm) ET o Reference evapotranspiration for grass (mm) ET r F Evaporative fraction or fraction of reference evapotranspiration ET 24Actual evapotranspiration for the entire 24-hour period (mm day −1 ) ET instHourly instantaneous ET (mm hr −1 ) LAI Leaf area index NDVI Normalized difference vegetation index

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Section: Resultsmentioning

confidence: 83%

Remote sensing and in situ-based estimates of evapotranspiration for subirrigated meadow, dry valley, and upland dune ecosystems in the semi-arid sand hills of Nebraska, USA

Healey

Irmak

Arkebauer

et al. 2011

Irrig Drainage Syst

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“…However, water use rates are not necessarily correlated with increased drought tolerance, such that species with low consumptive water use are not necessarily more drought tolerant than a species with higher consumptive water use. Fernandez and Love (1993) evaluated 25 commercially available cool-season turfgrass cultivars and found that some tall fescue cultivars had higher water use, but still ranked higher in quality under progressive water stress compared with some perennial ryegrass cultivars with lower water use rates. Kopec et al (1988) reported that tall fescue cultivars with decreased water use wilted sooner than those with higher water use rates.…”

Section: Discussionmentioning

confidence: 99%

Deficit Irrigation Effects on Water Use Characteristics of Bentgrass Species

DaCosta

Huang

2006

Crop Science

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This study was designed to determine the effects of deficit irrigation on water use traits of colonial (Agrostis capillaris L.), creeping (A stolonifera L.), and velvet (A canina L.) bentgrasses and to compare their water use. Field experiments were conducted from July to November in 2002 and 2003. Plots were irrigated at four levels of irrigation based on the percentage of actual evapotranspiration (ETa): 100, 80, 60, and 40% ETa replacement. The influence of deficit irrigation on water use was evaluated by measuring soil water depletion (SWD) and water use efficiency (WUE). The WUE was quantified by the ratio of canopy net photosynthetic rate to transpiration rate and carbon isotope discrimination (CID). Evapotranspiration (ET) rates were compared among the three species under nonlimiting moisture conditions (100% ETa). Our results demonstrated that water use characteristics varied with species, irrigation regime, and climatic conditions. Irrigating at either 60 or 80% ETa had no significant effects on WUE compared with 100% ETa irrigation; however, plots irrigated at 60% ETa exhibited higher SWD compared with plots at 80 and 100% ETa Velvet bentgrass exhibited lower SWD, higher WUE, and lower CID compared with colonial bentgrass during the summer treatment period, and creeping bentgrass exhibited intermediate water use characteristics among the three species. These results suggest that irrigating bentgrass species at 60 to 80% ETa could be practiced to increase WUE during summer and 40% ETa during fall months under the conditions of this study.

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“…Using a controlled environment se ing, Ebdon et al (1998) showed that ET rates varied up to 60% among 61 Kentucky bluegrass cultivars in relation to temperature and vapor pressure defi cit, which ranged from 1.13 to 3.16 mm d⁻ 1 kPa⁻ 1 . Fernandez and Love (1993) identifi ed lowwater use cultivars representing Kentucky bluegrass, red fescue, and hard fescue (F. ovina var. duriuscula L. Koch) by evaluating cumulative ET rates under conditions of water stress.…”

Section: Environmental and Social Issues Water Consumptionmentioning

confidence: 99%