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
The teflon acts as a heat sink and thus insures that the temperature of the junction imbedded in it remains essentially constant. The soil instrument illustrated in Fig. 15 can be operated as a hygrometer (dew point) instrument or as a psychrometer. Different readout instruments are required for the two applications. The hygrometer or dew point technique is the newer and more accurate method. In this techique the thermocouple junction is cooled to the dew point temperature by means of the Peltier effect and a voltage reading is taken.
10 Fig. 8. If the lower end of a capillary tube is placed in water, water rises in the tube Fig. 9. Water rising in a capillary tube of radius r. The water "wets" the capillary tube with a contact angle b Fig. 10. 10) Ceramic materials used for tensiometer cups and pressure plates must have pores with a radius, r, small enough that the matric potential holding water in the pore [Eq. 10)] is greater than the pressure difference causing water to flow out of the pore. When the pressure potential is greater than the matric potential, air will enter the pore and the ceramic is not useful at that pressure .
I/Im = I/Ih - I/Iz - I/Ip, I/ImB = 15 cm - 15 cm - 0 cm = I/Imc = 15 cm - 30 cm - 0 cm 0 cm, = -15 cm, I/ImD = 15 cm - 45 cm - 0 cm = -30 cm, I/ImE = 15 cm - 45 cm - 0 cm = -30 cm, I/ImF = 15 cm - 27 cm - 0 cm = -12 cm . Calculating Potentials in Soil Columns 37 Point A is below the water table and consequently t/lmA =0. Solving Eq. 8) for t/lp and using the above value of t/lmA, we obtain t/lPA = t/lhA - t/lzA - t/lmA = 15 cm - 6 cm - 0 = 9 cm . The potentials that we have computed are summarized in the table below.
Applied Soil Physics: Soil Water and Temperature Applications by Professor Ronald J. Hanks, Professor Gaylen L. Ashcroft (auth.)