BRAE 340 Exam 3 questions well
answered already passed
Irrigation efficiency - correct answer ✔✔farm, field, district, basin
strict accounting of water destinations
single event or annual
Application efficiency - correct answer ✔✔field
makes assumptions- is the "target" met?
=DU * (1-PI losses)
Beneficial uses of Irrigation water - correct answer ✔✔Crop ET
Salt removal
cultural practices (weed germination and control, climate control, ET cover crops or windbreaks)
On-Farm Irrigation efficiency - correct answer ✔✔Why improve irrigation efficiency:
-water degradation
-energy consumption (excess pumping)
-fertilizers and chemical leaching
-reservoirs, pumps, valves capacity
-drainage problems
-excess water cost
-low crop yield
Good efficiency - correct answer ✔✔-applying water evenly to all plants (good DU)
, -putting on the correct depth (good timing)
-these 2 minimize deep percolation plus we need to minimize surface losses
Good irrigation - correct answer ✔✔1. achieve a good DU
2. Properly schedule irrigation events (good timing)
3. Collect runoff
4. Minimize evaporation and spray losses
Perfect timing - correct answer ✔✔SMD + LR = Dmin
Under irrigation - correct answer ✔✔SMD + LR > Dmin
Over irrigation - correct answer ✔✔SMD + LR < Dmin
Water destination diagram - correct answer ✔✔a representation of:
-Du
-Water for ET crop
-Runoff
-SMD
-PI losses
-Deep percolation
*used to understand how much as well as timing*
Surface Irrigation Constraints - correct answer ✔✔Infiltration rates change with time (during an
irrigation)
Infiltration rates change from irrigation event to event:
answered already passed
Irrigation efficiency - correct answer ✔✔farm, field, district, basin
strict accounting of water destinations
single event or annual
Application efficiency - correct answer ✔✔field
makes assumptions- is the "target" met?
=DU * (1-PI losses)
Beneficial uses of Irrigation water - correct answer ✔✔Crop ET
Salt removal
cultural practices (weed germination and control, climate control, ET cover crops or windbreaks)
On-Farm Irrigation efficiency - correct answer ✔✔Why improve irrigation efficiency:
-water degradation
-energy consumption (excess pumping)
-fertilizers and chemical leaching
-reservoirs, pumps, valves capacity
-drainage problems
-excess water cost
-low crop yield
Good efficiency - correct answer ✔✔-applying water evenly to all plants (good DU)
, -putting on the correct depth (good timing)
-these 2 minimize deep percolation plus we need to minimize surface losses
Good irrigation - correct answer ✔✔1. achieve a good DU
2. Properly schedule irrigation events (good timing)
3. Collect runoff
4. Minimize evaporation and spray losses
Perfect timing - correct answer ✔✔SMD + LR = Dmin
Under irrigation - correct answer ✔✔SMD + LR > Dmin
Over irrigation - correct answer ✔✔SMD + LR < Dmin
Water destination diagram - correct answer ✔✔a representation of:
-Du
-Water for ET crop
-Runoff
-SMD
-PI losses
-Deep percolation
*used to understand how much as well as timing*
Surface Irrigation Constraints - correct answer ✔✔Infiltration rates change with time (during an
irrigation)
Infiltration rates change from irrigation event to event:
