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Concepts of soil moisture availability and their effect on soil moisture estimates from a meteorological budget

✍ Scribed by W. Baier

Publisher
Elsevier Science
Year
1969
Weight
621 KB
Volume
6
Category
Article
ISSN
0002-1571

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✦ Synopsis

Soil moisture measurements by means of Colman electrical resistance blocks over 10 years were used to test the effect of various relationships between plantavailable soil moisture (SM) and the ratio of actual (AE) to potential (PE) evapotranspiration on soil moisture estimates obtained by the Versatile Budget. Depending on the type of relationship used, correlation coefficients (ranging from 0.76 to 0.85) between 5-day means of SM observations and estimates differed significantly and mean errors varied from 3 ~ to 39 ~ of the observed seasonal means. Under the local experimental conditions, a linear relationship between SM and AE/PE gave estimates most closely related to the observations. The results suggest that when a realistic SM vs. AE/PE relationship is used in the Versatile Budget, a precision of the estimates comparable to the error involved in measuring soil moisture in the field by conventional methods can be achieved. m _ _ 1 The computer program of the VB was written in Fortran V level for the Univac 1108 computer and is identified as program 111 I-B004 by the

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