AGN 115 Sustainable Agriculture and the Environment Test 3
| 100% Correct Answers | Verified | Latest 2024 Version
In Dr. Terry Tollefson's videos on soil biology, he presented several microscopic organisms that were
found in the soil sample. Other than bacteria, identify three other microscopic organisms from the video
using one well-written sentence. - ✔✔Dr. Terry Tollefson's video identified protozoa, nematodes, and
mites.
During lecture, Dr. Burton presented soil test results from two of his farm fields. What contributed to the
"excessive" level of phosphorus in one of the fields? - ✔✔The previous owner of Dr. Burton's field
allowed the dairy across the road to spread some manure from their lagoon onto the field. The
neighbors spread an excess of manure until the owner threatened to call the Department of Natural
Resources.
Few plants, especially agricultural crops, grow well outside the pH range of 5 to 8. (Ch. 8)
True or False? - ✔✔True
Soils differ in the amount of water they hold at ____ , which is the moisture left in the soil after the
downward pull of water has pulled away gravitational water. (Ch. 9)
A. capillary water
B. permanent wilting point
C. ponding
D. field capacity
E. none of the given answers are correct - ✔✔D. field capacity
Lawn clippings and soil from edging become sources of organic contaminants and nutrients in untreated
storm runoff - they should be ____. (Soil Con. Lecture)
A. swept back into the lawn
B. blown back into the lawn
, C. composted
D. all of the above are acceptable - ✔✔D. all of the above are acceptable
During lecture we examined a photograph of cotton roots growing within the soil profile. In the
photograph, many roots grew where ____. (Select all correct answers)
A. the plow pan was broken by a "ripper" or subsoil tillage device
B. the soil was firmed (compacted) by wheel traffic
C. fertilizer was applied
D. bulk density was low
E. irrigation had occurred - ✔✔A. the plow pan was broken by a "ripper" or subsoil tillage device
C. fertilizer was applied
D. bulk density was low
E. irrigation had occurred
(not B)
Compared to no till, conventionally tilled soils have runoff that is ___. (soil cons. lecture)
Note: High water quality means that there is little or no suspended sediment, nutrients or bacteria.
A. Much greater in quantity and much lower in quality
B. Similar in quantity and quality
C. Much lower in quantity and much lower in quality
D. Much lower in quantity and much higher in quality
E. Much greater in quantity and much higher in quality - ✔✔A. Much greater in quantity and much lower
in quality
The tendency of a soil or clay mineral to increase or decrease in volume when they are hydrated is called
its "shrink-swell capacity".
| 100% Correct Answers | Verified | Latest 2024 Version
In Dr. Terry Tollefson's videos on soil biology, he presented several microscopic organisms that were
found in the soil sample. Other than bacteria, identify three other microscopic organisms from the video
using one well-written sentence. - ✔✔Dr. Terry Tollefson's video identified protozoa, nematodes, and
mites.
During lecture, Dr. Burton presented soil test results from two of his farm fields. What contributed to the
"excessive" level of phosphorus in one of the fields? - ✔✔The previous owner of Dr. Burton's field
allowed the dairy across the road to spread some manure from their lagoon onto the field. The
neighbors spread an excess of manure until the owner threatened to call the Department of Natural
Resources.
Few plants, especially agricultural crops, grow well outside the pH range of 5 to 8. (Ch. 8)
True or False? - ✔✔True
Soils differ in the amount of water they hold at ____ , which is the moisture left in the soil after the
downward pull of water has pulled away gravitational water. (Ch. 9)
A. capillary water
B. permanent wilting point
C. ponding
D. field capacity
E. none of the given answers are correct - ✔✔D. field capacity
Lawn clippings and soil from edging become sources of organic contaminants and nutrients in untreated
storm runoff - they should be ____. (Soil Con. Lecture)
A. swept back into the lawn
B. blown back into the lawn
, C. composted
D. all of the above are acceptable - ✔✔D. all of the above are acceptable
During lecture we examined a photograph of cotton roots growing within the soil profile. In the
photograph, many roots grew where ____. (Select all correct answers)
A. the plow pan was broken by a "ripper" or subsoil tillage device
B. the soil was firmed (compacted) by wheel traffic
C. fertilizer was applied
D. bulk density was low
E. irrigation had occurred - ✔✔A. the plow pan was broken by a "ripper" or subsoil tillage device
C. fertilizer was applied
D. bulk density was low
E. irrigation had occurred
(not B)
Compared to no till, conventionally tilled soils have runoff that is ___. (soil cons. lecture)
Note: High water quality means that there is little or no suspended sediment, nutrients or bacteria.
A. Much greater in quantity and much lower in quality
B. Similar in quantity and quality
C. Much lower in quantity and much lower in quality
D. Much lower in quantity and much higher in quality
E. Much greater in quantity and much higher in quality - ✔✔A. Much greater in quantity and much lower
in quality
The tendency of a soil or clay mineral to increase or decrease in volume when they are hydrated is called
its "shrink-swell capacity".
