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1. Drought Resistant Turf Species
for Colorado
Tony Koski
Extension Turf Specialist
Colorado State University
Dept. of Horticulture and Landscape Architecture
2. Turfgrass Responses to
Drought Stress
Wilt
Reduced vertical growth
Decreased density
Reduced color
Increased leaf firing
Increased canopy temperature
7. Drought Avoidance Mechanisms
Reduced ET
Deep, Extensive Root
System
Root Plasticity
High Root:Shoot
Reduced radiation
absorption Example: Tall Fescue
Xeromorphic characteristics
8. Turfgrass water use
Total amount of water
used for growth plus
that lost by
transpiration and
evaporation from plant
and soil surfaces.
J. B. Beard, 1973
May or may not be
related to drought
resistance
9. Turfgrass ET Classification
Relative ET
Ranking mm day-1
Very low < 4.0
Low 4.0-4.9
Medium-low 5.0-5.9
Medium 6.0-6.9
Medium-high 7.0-7.9
High 8.0-8.9
Very high >9.0
J. B. Beard, 1985
Tall fescue
Kentucky bluegrass, buffalograss
10. Reported range of turfgrass ET by species
ET+
Com on Nam
m e Scientific Name Inch/wk
(m day-1)
m
Tall Fescue 7-13 2.0-3.8
Festuca arundinacea
1.8-3.1
Perennial Ryegrass 7-11
Loliumperenne
St. Augustinegrass 6-11
Stenotaphrumsecundatum
Seashore Paspalum 6-8
Paspalumvaginatum
Bahiagrass 6-8
Paspalumnotatum
Kikuyugrass 6-9
Pennisetumclandestinum
Creeping Bentgrass 6-10
Agrostis Palustris
Centipedegrass 5-9
Erem ochloa ophiuroides
Berm udagrass 4-9
Cynodon spp.
Zoysiagrass 5-8
Zoysia spp.
1.1-1.8
Kentucky Bluegrass 4-7
Poa pratensis
1.5-2.0
Buffalograss 3-6
Buchloe dactyloides
+
Field grown under high evaporative demand conditions
11. Turf Survival Without Water in
Colorado
BEST: buffalograss, blue grama, bromegrass,
wheatgrasses, bermudagrass can survive
without ANY supplemental irrigation
FAIR: Kentucky bluegrass, fine fescues,
bentgrass and zoysiagrass can become
dormant and survive for many (3-6)
months without irrigation; some thinning
will occur
POOR: perennial ryegrass and tall fescue may
survive 2-4 months without ANY irrigation,
but will be severely thinned
VERY POOR: annual bluegrass; survives due
to prolific seed production
12. Factors Affecting Drought
Survival
Condition/health of turf
entering drought
Exposure to sun, wind
Soil type (better survival
on fine-textured soils)
Excess thatch will reduce
survivability
Varietal differences
Traffic will reduce ability
to survive prolonged
drought
13. Kentucky bluegrass (Poa pratensis)
High quality
Great recuperator
Sod-former
Stress-resistant
Thatch-former
Poor shade
tolerance
Disease-prone
Higher water and N
requirements
14. KBG is drought resistant
KBG cultivars vary
in ability to remain
green during
extended drought
15. KBG Varieties for Drought Resistance
SR2000
Livingston
America
Unique
Apollo
Showcase
Brilliant
Classic
Compact
16.
17. How much water does
bluegrass REALLY need to
stay green?
18. Annual Lawn Water Needs
KBG needs 24-26 inches per growing season to stay
healthy
“normal” precipitation year (10-11 inches, April-October)
Accounts for average irrigation coverage
provides for trees, other plants in the landscape
Tall fescue maybe 10% less than KBG (20-22 inches)
With deep roots
With good subsoil moisture, normal precipitation year
Tall fescue maybe 10% MORE than KBG with shallow
rooting, no subsoil moisture (or poor soil)
Fine fescues? 18-20 inches (with deep roots, good soil)
Buffalograss? 8-10 inches for GOOD quality
Bermudagrass? Slightly less than buffalograss!
Saltgrass? Less than or equal to bermuda and buffalograss
19.
20.
21.
22.
23. KBG Varieties for Heavy Use
Rugby II Compact
America Haga
Champagne Jewel
Sidekick Liberator
Bluechip Princeton 105
Odyssey Quantum Leap
Unique Rambo
Brilliant Total Eclipse
Award Limousine
24. Tall fescue (Festuca arundinacea)
Slow thatch former
“Tough” turf/good quality
Few pest problems
Low N requirement, and
MAY save water
Can’t recuperate
“Tender” when young
More frequent mowing than
KBG
Tough leaves dull mower
blades
25.
26.
27.
28.
29.
30.
31.
32.
33. Buffalograss (Buchloe dactyloides)
Native to North America
Very stress resistant
Low maintenance
Sod-former
Difficult to propagate
Poor traffic tolerance
Dormant most of year
Weeds can be a problem
38. Fine fescues (Festuca spp.)
Low maintenance
Good stress tolerance
Fine texture, high density
Shade tolerant
Poor traffic tolerance
Don’t like heat (dormancy)
Very thatchy
Plum Creek Golf Club
Poor recuperation rate
fine fescue roughs
43. Development of Turf-type Saltgrass
Dana Christensen, Yaling Qian, Tony Koski,
Harrison Hughes
Colorado State University
David Kopec and Mohamed Pessarkli
University of Arizona