CPSC 112 Final Exam UIUC UPDATED Exam Questions and CORRECT Answers
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Course
CPSC 112
Institution
CPSC 112
CPSC 112 Final Exam UIUC UPDATED
Exam Questions and CORRECT Answers
Furrow Irrigation - Correct Answer- Crops in row slightly elevated, sloped "furrows" between
rows convey water, over 50% of the US irrigated farmland, water rights in the arid west
which soil textures have the highest plant a...
CPSC 112 Final Exam UIUC UPDATED
Exam Questions and CORRECT Answers
Furrow Irrigation - Correct Answer- Crops in row slightly elevated, sloped "furrows" between
rows convey water, over 50% of the US irrigated farmland, water rights in the arid west
which soil textures have the highest plant available water - Correct Answer- clay, sand, sandy
loam, loam, clay loam, silty loam
Plant available water - Correct Answer- field capacity-permanent wilting point
options for increasing WUE (water use efficiency) - Correct Answer- agronomic =
yield/amount of water applied
physiological = unit of biomass/unit of water transpired
photosynthetic = unit of C assimilation/unit of water transpired
properties of agricultural systems with agroecology - Correct Answer- productivity, stability,
sustainability, and equitability
crop rotation benefits in organic agriculture - Correct Answer- replenishment of N, pathogen
reduction, soil quality improvements, soil fertility
general idea of 0.4% (or 4 per 1000) French initiative - Correct Answer- if we increase soil
carbon by 4% per year, then we can halt the annual increase of CO2 in the atmosphere
organic standards - Correct Answer- no inorganic fertilizers, no synthetic chemicals
(herbicides, pesticides, fungicides - but some bio based products okay), and no GMOs
, benefits of using legumes in organic agriculture - Correct Answer- fixes N, helps to control
weeds, improve soil structure, erosion control,
method of calculating yield gaps - Correct Answer- yield potential-actual yield obtained by
farmers
most important variables influencing energy efficiency and net energy output - Correct
Answer- water use, water loss, net energy yield = energy output in grain-sum of all energy
inputs
options for increasing water productivity in rain-fed systems - Correct Answer- 1) Increase
yields
2) Increase precipitation capture (e.g.
mulching soil surface)
3) Increase soil water storage (e.g.
through increased SOM)
4) Minimize losses (e.g. decrease
runoff/evaporation by increasing
infiltration rates with no-till)
soil greenhouse gases (GHGs) occurring in agriculture - Correct Answer- carbon dioxide (soil
respiration, primarily offset by crop CO2 fixation), methane (CH4, flooded soils (rice) and
animal production), and nitrous oxide (N2O, arable soils , primarily related to N fertilizer and
manure application)
why is N2O such a concern - Correct Answer- it often represents over 50% of total CO2
equivalents for corn production, also somewhat unavoidable because it is produced during
nitrification and denitrification processes (especially when soil N is high), N fertilizer is
needed for high yields yet ag is targeted as possible climate change mitigation opportunity
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