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

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

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14, an apparatus is shown that can be used to measure the soil water potential or the individual components of the water potential (solute Water Potentials 52 Semipermeable Unglazed membrane ceramic Semipermeable membrane Fig. 14. An apparatus for measuring water potential and its components. If pure water is connected to wet soil via a semipermeable membrane, the attached mercury column measures water potential, 1/Iw . If soil solution is connected to wet soil via a ceramic membrane, the attached monometer measures matric potential, 1/Im.

22 Given: Data were collected for a soil sample using the filter paper method of estimating water potential. 19. Find: Estimates of I/Jm, I/Jw, and I/Js for the soil. Solution: For I/Jm we use Eq. 451. 8 bars. 235 . 2 bars. We then calculate I/Js by difference using a form of Eq. 4 bars. Note: The high value of I/Js indicates that this soil had an extremely high salinity. 3 bars - a considerably lower sali"nity. : Evaluation of the filter paper method for estimating soil water potential. Soil Sci.

Moreover, the porosity characteristics of the cup must be such that the pores will be full of water over the entire range for which the tensiometer is designed to operate. , for the water to flow out of the pores) at higher vacuums, then air would flow into the tensiometer through the empty pores, the vacuum would be lost, and the instrument would become nonfunctional. 5 Scheduling Irrigation With Tensiometers The purpose of irrigation is to keep a soil water condition in the root zone that does not greatly restrict plant growth - or we might say, to maintain a water condition that is "comfortable" for the plants.

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