Read e-book online Soil and Environmental Analysis: Physical Methods, Second PDF

By SMith Mullins

ISBN-10: 0585418934

ISBN-13: 9780585418933

ISBN-10: 0824704142

ISBN-13: 9780824704148

ISBN-10: 0824745361

ISBN-13: 9780824745363

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Read Online or Download Soil and Environmental Analysis: Physical Methods, Second Edition, Revised, and Expanded (Books in Soils, Plants, and the Environment) PDF

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Extra resources for Soil and Environmental Analysis: Physical Methods, Second Edition, Revised, and Expanded (Books in Soils, Plants, and the Environment)

Sample text

7) incorporates a TDR plus a data logger and Fig. 7 A TRASE TDR system. Soil Water Content 33 interpretation software. Waveguides are available for TRASE that can be used for measurements at the surface or buried for continuous monitoring. Stored data is easily downloaded into a PC via a RS-232 connection. For routine measurement of soil water content, it is a well integrated user-friendly system. Commercial TDR systems are supplied with in-built software that analyzes each waveform. Such software works well with waveforms produced in homogeneous media.

For detailed discussion of waveguide sampling volume see Knight (1992, 1995). b. Constraints on Waveguide and Cable Length The length of waveguide used will be dictated by two main factors: the volume of soil to be measured and its electrical characteristics. 15 cm is recommended as the minimum waveguide length for routine field work with most systems. The error in measurement increases as the sensors become shorter, because the accuracy with which the returning pulse can be timed is fixed, and so the proportional accuracy increases as the length of the waveguide increases.

However, the shorter the waveguide, and the greater the distance between the electrodes, the smaller the influence of electrical conductivity. In soils with a high electrical conductivity, the length of waveguide that can be used effectively is limited to 50 cm or less. Thus before deciding on a field installation, it is advisable to assess the soil’s attenuation characteristics. This can be as simple as taking the TDR to the field site, wetting the soil, and installing a waveguide to see if an interpretable waveform is generated.

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Soil and Environmental Analysis: Physical Methods, Second Edition, Revised, and Expanded (Books in Soils, Plants, and the Environment) by SMith Mullins


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