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KW Multiple Choice (40 pts.)
1. An organism that subsists by eating predators would function as a(n) in the soil
ecosystem. mg? 3 Q
A. primary consumer w are l? W
6"} (a CSES 2203-SOIL SCIENCE
/ First Hourly Exam
«53:5 ta September 21, 2010
Problems (30 Pts. Total) ,
l. A metal ring 8.0 cm in diameter (id), 12 cm high, and weighing 80.0 g is driven into the soil,
extracted, trimmed and dried overnight in an ove
Hydrogen Bonding: Relatively low energy bonding exhibited by a hydrogen atom
located between two highly electronegative atoms, such as hydrogen or oxygen.
Adhesion: Molecular attraction that holds the surfaces of two substances in contact.
Soil- 1. A dynamic natural body composed of mineral and organic solids, gasses, liquids and living organisms,
which can serve as a median for plant growth (edaphology definition). 2. The collection of natural bodies
occupying parts of the Earths surface t
Maximum allowable daily loadings (MDL)- The largest amount of nutrient run off and
leaching permitted from an area of land
Best management practices (BMP)- The primary mean of preventing nutrient pollution
of water by avoiding excessiv
October 11, 2011
Ap0 to 10 cm; dark brown (10 YR 3/3) silt loam; weak coarse granular structure; many
fine roots throughout.
A10 to 33 cm; dark yellow brown (10 YR 3/4) silt loam; moderate coarse granular
Point Source- A pollution source that can be traced back to its origin.
Nonpoint Source- A pollution source that cannot be traced back to its origin.
Maximum Allowable Daily Loadings (MDL)- The largest amount of nutrient leaching
and runoff per
Land Degradation- reduction of the productive potential of a soil and its diminished
capacity to provide benefits to humanity
Desertification- The spreading of desert conditions that disrupt semiarid and arid
ecosystems (including agroecosyste
Xenobiotics- Compounds foreign to biological systems. Often refers to compounds
resistant to decomposition.
Organic Farming- A system and philosophy of farming that avoids the use of synthetic
chemicals while it emphasizes soil organic matter and biologic
Equilibrium phosphorus concentration (EPC)- The concentration of phosphorous in a
solution in equilibrium with s soil, the EPC0 being the concentration of phosphorous
achieved by desorption of phosphorous from a soil to phosphorous-free distilled water
Atterberg Limit- Water contents of fine-grained soils at different states of consistency.
Liquid Limit (LL)- the water content corresponding to the arbitrary limit
between the liquid and plastic states of consistency of a soil.
Plastic Limit (PL)- the wat
AGRN 2203 - Soil Science Exam III Tuesday, April 18, 2000
Your Name_ TA_
1. All of the following are aspects of the "phosphorus problem" in soil fertility except: _ a) the total phosphorus level of soils is low. b) much of the phosphorus in soils is