BRAE 340 Final Exam Questions Solved 100% Latest Update 2025
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Course
BRAE 340
Institution
BRAE 340
BRAE 340 Final Exam Questions Solved 100% Latest Update 2025
Once past the germination stage, plants tend to respond to average root zone salinity. - Answers True
The equation LR = ECw ÷ [(5 * ECe) - ECw] is for reclamation (not maintenance) leaching. - Answers False
What are the four major fac...
BRAE 340 Final Exam Questions Solved 100% Latest Update 2025
Once past the germination stage, plants tend to respond to average root zone salinity. - Answers True
The equation LR = ECw ÷ [(5 * ECe) - ECw] is for reclamation (not maintenance) leaching. - Answers False
What are the four major factors that determine the numerical value of the crop coefficient Kc? -
Answers A. Crop, stage of growth, soil surface wetness, and plant moisture stress.
This week in the Central Valley, cotton ETc = 0.35 in/day and ETo = 0.30 in/day. This week in the low
desert ETo = 0.43 in/day. What is the ETc for cotton in the low desert? - Answers A. 0.50 in/day
The correct relationship between the ET for a reference crop and the evapotranspiration for some other
particular crop is: - Answers ETc = Kc * ETo
Which of the following pairs would be MOST likely to generally improve irrigation efficiency? - Answers
Minimize evaporation & spray losses and collect and reuse runoff
California, unlike the USBR, uses a grass reference for determining ETo. - Answers True
A lysimeter is a container filled with soil and a growing crop which is weighed to determine salinity. -
Answers False
In areas using alfalfa as the reference crop, ET for alfalfa is equal to the reference ET. - Answers False
Which of these is NOT an ADVANTAGE of improving low on-farm irrigation efficiency? - Answers More
frequenct irrigations
For each condition, determine how Kc relates to Kcb.
Wet soil surface, root zone moisture low enough to cause some stress
Wet soil surface, root zone moisture high enough to cause no stress.
Air dry soil surface, root zone moisture low enough to cause some stress.
Air dry soil surface, root zone moisture high enough to cause no stress - Answers Wet soil surface, root
zone moisture low enough to cause some stress - Impossible to tell, Wet soil surface, root zone moisture
high enough to cause no stress. - Kc is higher than Kcb, Air dry soil surface, root zone moisture low
enough to cause some stress. - Kc is lower than Kcb, Air dry soil surface, root zone moisture high enough
to cause no stress. - Kc is equal to Kcb
Under surface irrigation, soil infiltration rates are not constant over the season. - Answers True
A 127 acre center pivot system, crop peak ETc = 0.26 in/day, DU = 82. Pre-infiltration losses = 5%. With
good management, what is the AE? - Answers 78
, A 95 acre center pivot system, crop peak ETc = 0.34 in/day, DU = 0.80. Pre-infiltration losses = 5%. What
is the minimum flow rate the system can have and still meet the net crop ET needs? - Answers 801 gpm
A 107 acre center pivot system, crop peak ETc = 0.32 in/day, DU = 0.85. Pre-infiltration losses = 5%. If the
actual system flow rate is 996 GPM, what revolution time applies 1 inch per turn net to the crop? -
Answers 60.2 hours
An irrigation system applies water with a DU = 0.70. ETc = 0.23 in/day, PI Losses = 0 and LR = 0. MAD =
59%. AWHC = 1.68 in/ft and RZ is 5 ft. How many days can you go between irrigations? - Answers 21.5
days
A hand move irrigation system is designed to apply 4.7 inches of water with a DU = 0.78. ETc = 0.21
in/day. PI losses and runoff are both zero. If irrigation occurs 5 days AFTER the perfect timing day, what
is the total deep percolation (in)?
Assume that 25% of the area is under irrigated. - Answers 0.38
What type of MAD do these conditions usually call for?
Strawberries
Answer 1
Surface irrigation systems with long runs and sandy soils
Answer 2
Corn during the pollination stage of growth
Answer 3
Situations calling for more frequent irrigations
Answer 4
Tomato or citrus, just prior to bud formation
Answer 5
Wine grapes prior to harvest
Answer 6
Cotton
Answer 7
Permanent set sprinkler irrigation systems
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