July 15, 2017

Download Applied Soil Physics: Soil Water and Temperature by Professor Ronald J. Hanks, Professor Gaylen L. Ashcroft PDF

By Professor Ronald J. Hanks, Professor Gaylen L. Ashcroft (auth.)

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Extra resources for Applied Soil Physics: Soil Water and Temperature Applications

Example text

5 bar. Find: The equivalent radius of the largest pore. 10) applies to this problem where the bubbling pressure is equal to -I/Im. For water 'Y = 72 dynes/em and cos {} = 1. We also need to convert bars to dynes/cm 2 (l bar = 10 6 dynes/cm 2 . •1. 88 X 10-4 em . Because a soil is a large complex of many different shaped pores, the water characteristic of the soil is a smooth curve upon wetting and a different smooth curve upon drying (see Fig. 12). It is, therefore, generally impossible to deduce a soil's water content by simply knowing its matric potential.

A soil hygrometer/ psychrometer for measuring soil water potential in situ. (After Campbell, 1972) POROUS CERAMIC junction) is obtained from the voltage reading by means of an appropriate conversion table or equation. In the older technique, known as the psychrometer method, the thermocouple junction is cooled below the dew point temperature and held there for sufficient time to allow water to condense on the thermocouple junction. When cooling is discontinued, the junction quickly warms to the wet bulb temperature where it remains for a short time while the condensed water evaporates.

When the pressure potential is greater than the matric potential, air will enter the pore and the ceramic is not useful at that pressure . A ceramic material with rather uniform pores will have a particular type of water characteristic curve. 9 C '1', E ~ ~ 1"8 0 a. :' C; E ... , C 0 :::E a. Pm' • Fig. :' b '0 :::E Fig. 12 Fig. 11 a and b. (a) An eliptical pore of maximum radius r2 which is connected to other pores by cylindrical capillaries ofradii rl and r3 . (b) The water characteristic curve for the pore.

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