Use Of Soil Survey Data to Select Measurement Techniques For Hydraulic Conductivity

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Bouma, J.
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The spatial variability of soil physical properties is receiving much attention lately in soil-physics research (e.g. Nielsen, 1982; Vachaud, 1982). In these studies, multiple field measurements yield data which are analysed by geostatistical techniques. So far, in these studies emphasis has been on the statistical analysis of data obtained. Vachaud (1982) has pointed out that experimental variability which is associated with applying a particular measurement technique, should also be considered because it may contribute sign- 1ficantly to overall variability. In addition, selection of the proper measurement technique for particular soil and site conditions 1S important. This aspect will be emphasized in this paper. Obviously, useless data are obtained when applying the wrong meth6d at the wrong time at the wrong place. Unfortunately, the latter statement is not too pessimistic. Physical measurements are increasingly required in many projects. Contracts often specify specific use of certain standard methods, without questioning their applicability. Method select10n as a function of soil and site conditions has received little attention so far, because most variability experiments have been made in rather homogeneous sandy or loamy soils where most physical techniques can be used. However, consideration of a wider range of soils, including clays, requires a critical analysis of the applicability of measurement methods. Again, the observed field variability is likely to be reduced if proper methods are selected. Soil and site conditions can be observed but they can also be derived from widely available soil-survey information, as will be discussed later.
Measurement Techniques, 6, p. 177-190