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
I/Izc = 6 cm The pressure potential for all points at or above the water table is zero. Thus, I/IpB = I/Ipc = I/IpD = I/IpE = I/IpF = 0 . If we solve Eq. 8) for matric potential, we now have enough information to find I/Im for points B through F. 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.
7. Water characteristic curves for several soils plotted in terms of percentage available water removed. Note that the curves come together at the value chosen for permanent wilting point and field capacity. (After Richards and Marsh, 1961; Taylor and Ashcroft, 1972, p. 17 Given: A pot experiment is conducted in a greenhouse using two soils, Sarpy loam and Geary silt loam. 6 cm/day, and at the beginning of the study, t/lm is -100 cm for both soils. Find: The matric potential, t/lm, and the daily change in matric potential, ilt/lm at the end of each day.
Such curves, however, are likely to be in error because the pore structure has been changed, and the arrangement of the soil pores greatly influences the water characteristic curves, especially on the wet end of the scale. One evidence of error in water characteristic curves that are determined using sieved soil samples follows. mfc ~ -100 cm. If the soil is dried, sieved, and brought to a water content corresponding to the field -measured field capacity, the matric-potential for most soils is about -330 cm (see Fig.
Applied Soil Physics: Soil Water and Temperature Applications by Professor Ronald J. Hanks, Professor Gaylen L. Ashcroft (auth.)