SCSC Exam 2 Questions with Revised Answers (All are Correct)
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Course
SCSC
Institution
SCSC
SCSC Exam 2 Questions with Revised Answers (All are Correct)
What is a soil? - Answer- medium for the production and growth of plants and crops
What are three important functions served by soils? - Answer- 1) Anchorage for plants
2) Storage of water or nutrients for plant uptake
3) Habitat ...
SCSC Exam 2 Questions
with Revised Answers (All
are Correct)
What is a soil? - Answer- medium for the production and growth of plants and crops
What are three important functions served by soils? - Answer- 1) Anchorage for plants
2) Storage of water or nutrients for plant uptake
3) Habitat for soil organisms (bacteria, fungi, insects, and invertebrates)
Describe the differences and/or similarities of natural ecosystems compared to
agroecosystems in terms of diversity, inputs, management, breeding, and nutrient loss.
- Answer- Natural Ecosystem: high diversity, no inputs, no management, no breeding
(except natural selection), no nutrient loss (nutrients recycle)
Agroecosystem: low diversity, high inputs (fertilizers, pesticides...), high management,
high breeding, some loss of soil and nutrients
Identify the five soil forming factors. - Answer- • parent material
• climate
• biological factors
• topography
• time
What is Fertilizer analysis or grade? - Answer- Nutrients listed on fertilizer
- N-P-K (nitrogen phosphoric acid and potash)
What is C : N ratio, and what does it affect? - Answer- Influences the rate of
decomposition of plant materials in the soil
- rate of decay decreases as C:N ratio increases
What are the five different functions of organic matter in soil? - Answer- •
Sequestrations of nutrients
• Sources of nutrients
• Soil aggregation and structure
• Water storage
• Chemical sequestration
, How many soil orders are in Texas? - Answer- 7
What is soil texture? - Answer- Describes the fineness or coarseness of a soil
What is soil tilth and what factors determining it? - Answer- Physical condition of the soil
as related to plant growth
• Ease of tillage
• Root penetration
• Aeration
• Water infiltration/drainage
Define shrink-swell potential in soil. Why is it important? - Answer- A measurement of
the amount of volume change that can occur when a soil wets and dries. Must be
considered in structural or engineering project plans i.e foundations and roads
How do soil textures affect the agricultural use of soil? - Answer- Soil texture (sand, silt,
clay) affects how the growth and production of the plant, how well its' roots can anchor
into the ground, and how difficult it is for the product to be harvested
Where do saline soils typically occur and what is the cause? - Answer- Saline soils
typically occur in dry regions where salts rise to the soil surface during water
evaporation.
What is the best way to determine nutrient availability in a specific soil? Briefly describe
how to collect a soil sample - Answer- Soil testing; collect many soil samples
List the six different fertilization methods: - Answer- 1) Broadcast
2) Injection
3) banding
4) popup fertilizers
5) side dressing
6) fertigation
List and describe the 3 types of organic fertilizers. - Answer- - Animal manures -
combination of feces and urine
- Compost - controlled decomposition of manure, crop residue, or other organic matter
by microorganisms in the presence of oxygen
- Green manures - plants that are grown and plowed under to improve soil and add
organic matter and nutrients
What is Fertilizer analysis or grade? - Answer- Nutrients listed on fertilizer
- Nutrients contents must be listed on the packaging (N-P-K)
Explain the difference between gravitational water, field capacity, and permanent wilting
point. - Answer- - Gravitational water - drains readily through the soil
- Field capacity - water is held in the pore spaces but is readily available to plants
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