Exam (elaborations)
AGRONOMY EXAM 3 QUESTIONS AND ANSWERS
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AGRONOMY EXAM 3 QUESTIONS AND ANSWERS
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Name: Score:145 Multiple choice questions
Term 1 of 145
Alkaline soils have a pH above 7.
True
False
Term 2 of 145
The three non-mineral nutrients found in air and water are:
John Froelich/ Henry Ford
Light quality, light duration, and light intensity
1. measures nutrient solubility
2. acidity
1. Hydrogen
2. Carbon
3. Oxygen
Term 3 of 145
The different layers of the atmosphere extend different distances. How high does the
mesosphere extend?
0.05-2 mm
8 miles
55-70 miles
30-55 miles
,Term 4 of 145
Soil Horizon "D" is the top soil layer. How deep does it go?
Parent material
40-50"
25%
Bedrock
Term 5 of 145
Semiarid crop region has an annual rain fall of how many inches?
Shallow root
20-30 inches
Soil Scientists
10-20 inches
Term 6 of 145
Porosity in the soil structure is defined as________.
Prospect Creek, Alaska
the spaces between the soil which allow water
and air to flow around soil particles.
of seed on top of field
Troposphere
,Term 7 of 145
Disadvantages of Monoculture crop production systems?
1. industrialized nations have the technology and
know-how to grow crops in monocultures.
2. responsible for producing very large quantities of food that feed the world.
3. easier to manage, producer has to contend with one set of practices, rather than
different sets for different crops.
4. can be very specific with weed control and seed selection
Not a new practice - been doing this since societies switched from hunting and
gathering for food to settling in one area
1. Anchors the roots and support plants
2. Supplies water to plants
3. Provides mineral nutrients to plants
4. Provides for gas exchange to plant roots
1. are susceptible to pests and disaster. Pest outbreak can wipe out an entire crop since
all plants are equally susceptible to a particular pest.
2. no insurance against adversity (weather)
3. lack of diversity means the presence of a fewer number of natural enemies of the
pests that plaque the crop.
Term 8 of 145
Select 4 descriptors of the "A" horizon.
Light quality, light duration, and light intensity
Plowing, disking, cultivating, planting, cultivating
1. Highly weathered
2. Abundant life
3. high in organic matter
4. dark colored
5. most leached horizon
1. Granular
2. Platy
3. Blocky
4. Prismatic
, Term 9 of 145
What percentage of water is in the oceans?
15-30%
True
97%
2% (1-5%)
Term 10 of 145
What are the "three sisters"?
Cucumber, tomato, pea
Corn, beans, and squash
Conservation
Conventional
Term 11 of 145
Four basic types of soil structure are?
the ease at which gases, liquids, and plant roots pass through the bulk mass of a soil.
Light quality, light duration, and light intensity
1. Granular
2. Platy
3. Blocky
4. Prismatic
Plowing, disking, cultivating, planting, cultivating
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