{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture24-25(2008) - SOIL WATER POTENTIAL Read Within pages...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
SOIL WATER POTENTIAL Read : Within pages 105 to 125 Introduction to Environmental Soil Ph ysics Units for Ex pressin g Soil Water Potentials Pressure and gravitational potentials are often expressed in terms of the hei ght of a column of water , which will develop an equivalent pressure or suction. Matric and osmotic potentials are frequently expressed in terms of kPa (centimeters or meters of water ) and various other units of pressure. The following conversions are useful: 1 bar = 0.987 atmosphere = 1,017 cm of H 2 O = 10 -1 megapascal, MPa (10 6 Pa). ALSO 1 cbar = 1 kPa = 10 cm of H 2 O.
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
1) Gravitational potential, M g — depends only on elevation above or below a reference point. Measure with GPS unit, ruler, tape, etc. 2) Pressure potential, M p — depends on the length of the column of water above a reference point. As this is often called the piezometric head, obviously it can be measured with a piezometer (often abbreviated as h or p as expressed in cm or m of water).
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern