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TDR Technique for Estimating the Intensity of Evapotranspiration of Turfgrasses.

Janik G, Wolski K, Daniel A, Albert M, Skierucha W, Wilczek A, Szyszkowski P, Walczak A - ScientificWorldJournal (2015)

Bottom Line: Those parameters are the temperature and the volumetric moisture of soil at the depth of 2.5 cm.Evapotranspiration has the character of a modified logistic function with empirical parameters.It assumes the form ETR(θ (2.5 cm), T (2.5 cm)) = A/(1 + B · e (-C · (θ (2.5 cm) · T (2.5 cm)), where: ETR(θ (2.5 cm), T (2.5 cm)) is evapotranspiration [mm · h(-1)], θ (2.5 cm) is volumetric moisture of soil at the depth of 2.5 cm [m(3) · m(-3)], T (2.5 cm) is soil temperature at the depth of 2.5 cm [°C], and A, B, and C are empirical coefficients calculated individually for each of the grass species [mm · h(1)], and [-], [(m(3) · m(-3) · °C)(-1)].

View Article: PubMed Central - PubMed

Affiliation: Institute of Environmental Protection and Development, Wrocław University of Environmental and Life Sciences, Plac Grunwaldzki 24, 50-363 Wrocław, Poland.

ABSTRACT
The paper presents a method for precise estimation of evapotranspiration of selected turfgrass species. The evapotranspiration functions, whose domains are only two relatively easy to measure parameters, were developed separately for each of the grass species. Those parameters are the temperature and the volumetric moisture of soil at the depth of 2.5 cm. Evapotranspiration has the character of a modified logistic function with empirical parameters. It assumes the form ETR(θ (2.5 cm), T (2.5 cm)) = A/(1 + B · e (-C · (θ (2.5 cm) · T (2.5 cm)), where: ETR(θ (2.5 cm), T (2.5 cm)) is evapotranspiration [mm · h(-1)], θ (2.5 cm) is volumetric moisture of soil at the depth of 2.5 cm [m(3) · m(-3)], T (2.5 cm) is soil temperature at the depth of 2.5 cm [°C], and A, B, and C are empirical coefficients calculated individually for each of the grass species [mm · h(1)], and [-], [(m(3) · m(-3) · °C)(-1)]. The values of evapotranspiration calculated on the basis of the presented function can be used as input data for the design of systems for the automatic control of irrigation systems ensuring optimum moisture conditions in the active layer of lawn swards.

No MeSH data available.


Related in: MedlinePlus

Maps of evapotranspiration for the turfgrasses. θ is volumetric moisture measured at the depth of 2.5 cm, T is temperature measured at the depth of 2.5 cm, and ETR is evapotranspiration.
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fig8: Maps of evapotranspiration for the turfgrasses. θ is volumetric moisture measured at the depth of 2.5 cm, T is temperature measured at the depth of 2.5 cm, and ETR is evapotranspiration.

Mentions: Figure 8 presents the maps of evapotranspiration for the 4 grasses, plotted in the program Surfer. They are helpful in the choice of the type of the function approximating evapotranspiration. The shapes of the maps obtained indicate that the most adequate solution is to use the modified logistic function for the description. The domain of a function is the volumetric moisture and temperature at the depth of 2.5 cm (θ2.5 cm, T2.5 cm). It assumes the following form:(5)ETRθ2.5 cm,T2.5 cm=A1+B·e−C·θ2.5 cm·T2.5 cm,where ETR(θ2.5 cm, T2.5 cm) is evapotranspiration [mm·h−1], θ2.5 cm is volumetric moisture at the depth of 2.5 cm [m3·m−3], T2.5 cm is temperature at the depth of 2.5 cm [°C], and A, B, and C are empirical coefficients calculated individually for each turfgrass species [mm·h1], [—], and [(m3·m−3·°C)−1].


TDR Technique for Estimating the Intensity of Evapotranspiration of Turfgrasses.

Janik G, Wolski K, Daniel A, Albert M, Skierucha W, Wilczek A, Szyszkowski P, Walczak A - ScientificWorldJournal (2015)

Maps of evapotranspiration for the turfgrasses. θ is volumetric moisture measured at the depth of 2.5 cm, T is temperature measured at the depth of 2.5 cm, and ETR is evapotranspiration.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4581558&req=5

fig8: Maps of evapotranspiration for the turfgrasses. θ is volumetric moisture measured at the depth of 2.5 cm, T is temperature measured at the depth of 2.5 cm, and ETR is evapotranspiration.
Mentions: Figure 8 presents the maps of evapotranspiration for the 4 grasses, plotted in the program Surfer. They are helpful in the choice of the type of the function approximating evapotranspiration. The shapes of the maps obtained indicate that the most adequate solution is to use the modified logistic function for the description. The domain of a function is the volumetric moisture and temperature at the depth of 2.5 cm (θ2.5 cm, T2.5 cm). It assumes the following form:(5)ETRθ2.5 cm,T2.5 cm=A1+B·e−C·θ2.5 cm·T2.5 cm,where ETR(θ2.5 cm, T2.5 cm) is evapotranspiration [mm·h−1], θ2.5 cm is volumetric moisture at the depth of 2.5 cm [m3·m−3], T2.5 cm is temperature at the depth of 2.5 cm [°C], and A, B, and C are empirical coefficients calculated individually for each turfgrass species [mm·h1], [—], and [(m3·m−3·°C)−1].

Bottom Line: Those parameters are the temperature and the volumetric moisture of soil at the depth of 2.5 cm.Evapotranspiration has the character of a modified logistic function with empirical parameters.It assumes the form ETR(θ (2.5 cm), T (2.5 cm)) = A/(1 + B · e (-C · (θ (2.5 cm) · T (2.5 cm)), where: ETR(θ (2.5 cm), T (2.5 cm)) is evapotranspiration [mm · h(-1)], θ (2.5 cm) is volumetric moisture of soil at the depth of 2.5 cm [m(3) · m(-3)], T (2.5 cm) is soil temperature at the depth of 2.5 cm [°C], and A, B, and C are empirical coefficients calculated individually for each of the grass species [mm · h(1)], and [-], [(m(3) · m(-3) · °C)(-1)].

View Article: PubMed Central - PubMed

Affiliation: Institute of Environmental Protection and Development, Wrocław University of Environmental and Life Sciences, Plac Grunwaldzki 24, 50-363 Wrocław, Poland.

ABSTRACT
The paper presents a method for precise estimation of evapotranspiration of selected turfgrass species. The evapotranspiration functions, whose domains are only two relatively easy to measure parameters, were developed separately for each of the grass species. Those parameters are the temperature and the volumetric moisture of soil at the depth of 2.5 cm. Evapotranspiration has the character of a modified logistic function with empirical parameters. It assumes the form ETR(θ (2.5 cm), T (2.5 cm)) = A/(1 + B · e (-C · (θ (2.5 cm) · T (2.5 cm)), where: ETR(θ (2.5 cm), T (2.5 cm)) is evapotranspiration [mm · h(-1)], θ (2.5 cm) is volumetric moisture of soil at the depth of 2.5 cm [m(3) · m(-3)], T (2.5 cm) is soil temperature at the depth of 2.5 cm [°C], and A, B, and C are empirical coefficients calculated individually for each of the grass species [mm · h(1)], and [-], [(m(3) · m(-3) · °C)(-1)]. The values of evapotranspiration calculated on the basis of the presented function can be used as input data for the design of systems for the automatic control of irrigation systems ensuring optimum moisture conditions in the active layer of lawn swards.

No MeSH data available.


Related in: MedlinePlus