solar radiation is the driving force of sports turf ... - stma
TRANSCRIPT
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Solar Radiation is the Driving Force of Sports Turf Management
Karl Danneberger, Ph.D. The Ohio State University
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• Driving force for all biological activity • Biological Activity
– 0 to 50 C (32 to 122 F) – Metabolic processes 10 to 40 C (50 to 104 F)
• Little activity – < 0 C (32 F) – > 50 C (122 F)
Temperature
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Alteration of Light Quality
SOLAR RADIATION
absorption
transmission
reflection
rich in red light, low in far-red light
low in red light, rich in far-red light
Slide courtesy of Dr. Alfred Turgeon 2002 ©
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Canopy Temperature: Clear, Calm Conditions Wind
86 30
50 10
Ts= 70 F ( 21 C)
Tc=____
Ta= 90 F (32 C)
0 mph
Adequate Soil Moisture
105 F (41 C)
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Wind
Canopy Temperature: Clear, Windy Conditions
86 30
50 10
Ts= 70 F ( 21 C)
Tc=____
Ta= 90 F (32 C)
>5 mph
Adequate Soil Moisture
90 F (32 C)
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Canopy Temperature: Cloudy, Calm Conditions
86 30
50 10
Ts= 70 F ( 21 C)
Tc=____
Ta= 90 F (32 C)
Wind
0 mph
Adequate Soil Moisture
90 F (32 C)
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0 500 1000 1500 Light level (µmol m-2s-1)
2 4
6 8
10
12
Light Saturation Point
Light Compensation Point
C4
C3
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•require 4 to 5 hours of full sun/ day •(Fry & Huang, 2004).
•Creeping bentgrass can be shaded up to 6 hours per day (31 percent of full sunlight) and still maintain adequate turf quality
•(Bell & Danneberger, 1999).
•Warm season turfgrasses require more hours of sunlight. ‘Tifeagle’ requires at least 8 hours of full sunlight to provide adequate turf quality
•(Burnell, 2005).
How much Light?
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Light Absorption by the Leaf
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R<FR R>FR
Shade Avoidance Response
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Full Sun (FS) 49 mol m-2 d-1
R:FR = 1.4
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Neutral Shade (NS) 4.1 mol m-2 d-1 (8% FS) R:FR = 1.25
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Deciduous Shade (DS) 3.4 mol m-2 d-1 (7% FS) R:FR = 0.45
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05000
10000150002000025000300003500040000
400
430
460
490
520
550
580
610
640
670
700
730
760
790
Wavelength (nm)
D
etec
tor R
espo
nse
FS R:FR= 1.40 49 mol m-2 d-1
NS R:FR= 1.25 3.4 mol m-2 d-1
DS R:FR= 0.45 4.1 mol m-2 d-1
50%
100%
0%
Spectral Distribution of Treatments
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Neutral Shade 3.4 mol m-2 d-1
R:FR = 1.25 Full Sun 49 mol m-2 d-1
R:FR = 1.4
Deciduous Shade 4.1 mol m-2 d-1
R:FR = 0.45
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Impact of Raising the Height On Leaf Area and Photosynthetic Potential
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Full Sunlight
cv. Equinox
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Deciduous Shade cv. Equinox
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Figure 1. % of coverage of Crenshaw, Ax6548, and Ax6549 grown in full sun, reduced R:FR, reduced PPF, and reduced PPF and R:FR in 2008.
Clipping interval 10 days
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Ax6548, Ax6548 and Crenshaw at the day 1 of experiment. Ax6548, Ax6549, and Crenshaw
grown underfull sun, reduced R:FR, reduced PPF, and reduced PPF&R:FR on day 60 of the study.
Full sun R:FR PPF R:FR&PPF
Ax6548
Ax6549
CR
CR
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Figure 5. % of coverage of Crenshaw, Ax6548, and Ax6549 grown in full sun, reduced R:FR, reduced PPF, and reduced PPF and R:FR in 2009.
Clipping interval 5 days
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Figure 7. Ax6548, Ax6549 and Crenshaw at the day 1 of experiment. Figure 8. Ax6548, Ax6549, and
Crenshaw grown under full sun, reduced R:FR, reduced PPF, and reduced PPF&R:FR on day 60 of the study.
CR Ax6548 Ax6549
Ax6548 Ax6549 CR
FS R:FR rePPF PPF & R:FR
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AirFlow Restriction versus Low Light (Koh, et al. 2003)
Parameter Air Flow Restriction
Shade
Turf Density Decline > Decline
Disease (dollar spot, brown patch)
Pressure > Pressure
Root Mass Loss < Loss
Cultivar difference (L93 versus SR1020), L93 more shade tolerant
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100 % (FS N rate) 50 % (FS N Rate)
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