SWES 200 quiz 5

SWES 200 quiz 5 - Silt loam c Hold most water at saturation...

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SWES 200 Introduction to Soil Science Name _______________________ Quiz 5 Due February 21 in class Seat ________ Row _________ 1. other. Water will more likely move from soil A to soil B if their water potentials, expressed in kPa, are: a. A= -5 B= +5 b. A= -5 B= -5 c. A= -20 B= -10 d. A= -30 B= -40 e. A= -100 B= -50 Explain why your answer is correct. Water always moves from areas of higher (more positive or less negative) to areas of lower water potential. 2. Which soil a silt loam or a sand a. Hold the most water at field capacity? Silt loam b. Hold most water at permanent wilting point?
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Unformatted text preview: Silt loam c. Hold most water at saturation? Silt loam d. Have the most plant-available water? Silt loam 3. Explain the difference between water potential and water content . Water potential is a measure of the energy status of soil water (how tightly it is held by soil constituents or how free it is to move around). Its components are matric, osmotic, and gravitational potential. Water content is a measure of the amount of water in a soil, and tells nothing about its energy status. Water content can be expressed on a gravimetric (weight) or volumetric basis....
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