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| Author(s): | Anonymous |
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| Author Affiliation: | Navorsingsinstituut vir Vrugte en Vrugtetegnologie, Stellenbosch, South Africa |
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| Title: | A statistical comparison between measured evapotranspiration and meteorological formulae and elements |
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| Source: | Agrochemophysica. Vol. 4, No. 3, 1972, p. 63-68. |
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| Publishing Information: | Africa |
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| Keywords: | TIC Keywords: Evapotranspiration
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| Abstract/Contents: | Results of measured evapotranspiration (Et) by Thornthwaite-type lysimeters planted to grass (Stenotaphrum secundatum) were statistically compared with the following meteorological elements and formulae on a fortnightly and four-weekly basis: (I) Elements: mean daily air temperature in deg C (Tg); mean daily maximum air temperature in deg C (Tm); net radiation expressed as evaporation loss in mm H2O/day (Rn); and class A pan evaporation in mm/day (Eo). (II) Formulae: Penman; Olivier; Turc; Thornthwaite; Blaney-Criddle; and a modified Blaney-Criddle using Tm rather than Tg. All elements and formulae were highly correlated with Et, but Eo and the Blaney-Criddle formulae were the most promising. Fitting a second order polynomial to the values of Eo gave the lowest standard error (0.1403mm/day). Unfortunately extrapolation problems occurred because where Eo values were (2.64mm/day, calculated Et was negative. This problem was solved by applying harmonic analysis to the time series of the ratios Et/Eo, Et/Tm etc. (132.211). |
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| Language: | Afrikaans |
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| References: | Unknown |
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| Note: | Summary appears in English |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Anonymous. 1972. A statistical comparison between measured evapotranspiration and meteorological formulae and elements. (In Afrikaans) Agrochemophysica. 4(3):p. 63-68. |
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