AGR 455 Exam 1 Question and answers rated A+ 2024/2025
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Course
AGR 455
Institution
AGR 455
AGR 455 Exam 1 Question and answers rated A+ 2024/2025 AGR 455 Exam 1
What are 4 ways plants use soil? - correct answer Anchorage: firm support to reach expected growth
Water: roots are deep in soil and use the soil as a source of water
Oxygen: roots pick up oxygen from the soil
Nutrients:...
AGR 455 Exam 1
What are 4 ways plants use soil? - correct answer ✔Anchorage: firm support
to reach expected growth
Water: roots are deep in soil and use the soil as a source of water
Oxygen: roots pick up oxygen from the soil
Nutrients: plants absorb about 14 out of the 17 needed nutrients from soil
How is soil a 3-phase system? - correct answer ✔It contains soil solids,
voids containing pore water and empty voids filled with air
List and explain agricultural uses of soil - correct answer ✔Cropland: land in
which soil is worked and crops are planted, cared for and harvested
Grazingland: animals are released to graze naturally, but overstocked land
suffers damage to soil and water; proper grazing practices can be quite
sustainable
Forest: this disturbs the soil the least; when trees are harvested after several
years logging equipment tears up the soil and causes compaction
Landscape Horticulture: fruits, veggies, nursery stock, landscaping
Urban Ag: small scale farming in cities to produce food and alleviate heat in
cities
List and explain non-agricultural uses of soil - correct answer ✔Recreation:
sports fields, playgrounds, golf courses; sports fields may be the most
demanding soil use: growing turf,
Engineering: building homes, power lines, roads; soil must be evaluated to be
sure it is suitable for these things
Waste Disposal: spreading sewage waste for farmers as a source of
nutrients/OM
, Building Materials: some houses are built under the ground to keep cool, also
some houses are actually built from soil
What role does soil play in climate control? - correct answer ✔soil is
composed of gases; some are greenhouses that when released are trapping
heat in the atmosphere
having more OM in the soil draws out CO2 and leads to less heat in the
atmosphere
What is soil quality? - correct answer ✔AKA: Soil Health
capacity of a specific soil to provide needed functions for human or natural
ecosystems over the long-term
Aeration pore - correct answer ✔pores that drain out water due to
gravitational drainage and fill up with air
Anchorage - correct answer ✔function of soil to hold plant firmly in place
Best Management Practices (BMPs) - correct answer ✔procedures which
help reduce the amount of soil and nutrient runoff into nearby streams
carbon sequestration - correct answer ✔an approach to stabilizing
greenhouse gases by removing CO2 from the atmosphere
carbon sink - correct answer ✔A natural environment that absorbs and
stores more carbon dioxide from the atmosphere than it releases
EX: wood in trees, CO2 dissolved in oceans, OM trapped in Gelisols and
Histosols
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