CRSS 3070 Exam 2 (Questions &
Answers with rationale) (Latest
updated) (Verified A+ Pass)
2 types of sprinkler heads - Answers -✔✔ 1. Spray Heads
2. Rotating heads
- most widely used in turf
2 types of drive mechanisms in rotating heads - Answers -✔✔ 1. Impact Driven
2. Gear driven
High pressure on spray head = ___ droplets - Answers -✔✔ SMALL droplets, spread
non-uniform all around the area
Low pressure on spray head = ___ droplets - Answers -✔✔ LARGER droplets, more
water is spread further out from the head
Ideal pressure on a spray head gives a ___ shape distribution - Answers -✔✔ WEDGE,
with more water closer to the head
___ can alter spray pattern of sprinklers and is directly proportional to velocity - Answers
-✔✔ WIND
2 types of irrigation pipe - Answers -✔✔ 1. PVC
2. PE
___ is stretching of pipes caused by excessive water pressure over time - Answers -
✔✔ CREEP
what is the function of a manual valve - Answers -✔✔ to shut off the system for pipe or
head repair without the use of electricity
the catch can method shows distribution uniformity but does NOT show ___ - Answers -
✔✔ effective irrigation
- can't see where water penetrates the soil
What is irrigation? - Answers -✔✔ adding supplemental water when rainfall is
insufficient to meet plant needs
___ inches is required per week for normal maintenance - Answers -✔✔ 1 - 1.5"
, define evapotranspiration - Answers -✔✔ Total loss of moisture through evaporation
and transpiration
define evaporation - Answers -✔✔ water loss from the soil
define transpiration - Answers -✔✔ water loss from the plant
The ___ is primary ___ site which opens and closes in response to the environment to
let gases into the plant. - Answers -✔✔ STOMATA, TRANSPIRATION
Factors that affect evapotranspiration (5) - Answers -✔✔ 1. Grass species: warm
season have lower ET than cool
2. Humidity: drier air = more water loss from plant & soil
3. Temperature: Higher temp. = more ET
4. Wind: increases water loss
5. Canopy resistance: more dense = more resistant
___ soils have poor water holding capacity - Answers -✔✔ COARSE/SANDY
___ soils have poor water infiltration - Answers -✔✔ CLAY
___ soils provide the best rooting media - Answers -✔✔ LOAM/CLAY-LOAM
Standard rule for water application - Answers -✔✔ Apply water deeply and infrequently
- encourages deeper root growth
devices/methods that can determine when water should be applied (3) - Answers -✔✔
1. electronic soil probes
2. tensiometers
3. infrared thermometers
When is the best time to water turf? - Answers -✔✔ Early morning hours
Pros/Cons of watering in the day - Answers -✔✔ Pro: allows turf to dry
Con: more evaporation
Pros/Cons of watering @ night: - Answers -✔✔ Pro: Less windy, less evaporation
Con: turf stays wet longer = more disease potential
What is syringing and its benefits - Answers -✔✔ Syringing: watering by hand
- Benefits: cools turf, removes plant excretions
standing water on turf can create ___ when temperatures reach above ___ - Answers -
✔✔ SCALD, 104 degrees
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