TDR Technique for Estimating the Intensity of Evapotranspiration of Turfgrasses.
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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)].
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PubMed Central - PubMed
Affiliation: Institute of Environmental Protection and Development, WrocÅ‚aw University of Environmental and Life Sciences, Plac Grunwaldzki 24, 50-363 WrocÅ‚aw, 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(Î¸ (2.5 cm), T (2.5 cm)) = A/(1 + B Â· e (-C Â· (Î¸ (2.5 cm) Â· T (2.5 cm)), where: ETR(Î¸ (2.5 cm), T (2.5 cm)) is evapotranspiration [mm Â· h(-1)], Î¸ (2.5 cm) is volumetric moisture of soil at the depth of 2.5 cm [m(3) Â· m(-3)], T (2.5 cm) is soil temperature at the depth of 2.5 cm [Â°C], and A, B, and C are empirical coefficients calculated individually for each of the grass species [mm Â· h(1)], and [-], [(m(3) Â· m(-3) Â· Â°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 |
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Mentions: It was assumed that the evapotranspiration of selected turfgrass species can be calculated on the basis of a function whose domain is only two values: temperature and volumetric moisture of the surface layer of soil. The function can be determined on the basis of an experiment. The values that constitute its domain are relatively easy to measure, while the evapotranspiration can be calculated using the time-domain reflectometry (TDR), as illustrated in Figure 1. |
View Article: PubMed Central - PubMed
Affiliation: Institute of Environmental Protection and Development, WrocÅ‚aw University of Environmental and Life Sciences, Plac Grunwaldzki 24, 50-363 WrocÅ‚aw, Poland.
No MeSH data available.