Quiz 7 Answers 1. Soil A has a Ksat value of 8 cm/h, Soil B has a Ksat value of 0.00003 cm/h, and Soil C is shallow and rocky and has a Ksat value of 3 cm/h. a. which soil would be more suitable for agriculture? (1) Soil A b. which soil would be more suitable for wastewater lagoon lining? (1) Soil B 2. Name and describe three potential fates of water after precipitation on the soil surface. (3) +surface runoff: water does not infiltrate, runs over ground surface, picking up dissolvable pollutants or soil (erosion) +infiltration: movement of water into soil +drainage: water moves through soil profile and out of root zone (leaching) +evaporation: water vaporizes directly from soil to air +transpiration: water is taken up by plant, used in plant metabolism, and is released through leaves +percolation: water moves downward into soil profile +soil storage: water remaining in soil due to matric potential +capillary rise: water movement back into profile from water table during periods of dryness 3. What hydraulically significant properties should a prime site for agriculture include? (2) +level, not too sloping +well drained +deep and permeable +moderate infiltration rates +no impeding horizons +ample water storage capacity 4. Use a diagram to explain the difference in water content at field capacity and at the permanent wilting percentage. (3)

Classification of Soil Water http://www.pedosphere.com/volume01/pdf/section_08_03.pdf

Michael J. Singer and Donald N. Munns Soils: An Introduction, 6e

Figure 6.38

Soil Organisms and Ecology Chapter 11

Table 11.1

Figure 11.1

Michael J. Singer and Donald N. Munns Soils: An Introduction, 6e

Figure 11.23