Soilless Subrates
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Understanding Bark, Peat, and Pumice in Your Soilless Substrate
J.S. Owen Jr., M. Zazirska-Gabriel, and D. SullivanOregon State University, Aurora, OR
J.E. AltlandApplication Technology Research Unit, USDA-ARS, Wooster, OH
J.P. Albano US Horticultural Res. Lab, USDA-ARS, Fort Pierce, FL
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Douglas Fir BarkDouglas Fir Bark
AGED FRESH
Altland
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Data CollectionData Collection3-inch coresPorometers
Total porosity (TP)Container Capacity (CC)Air Space (AS)Bulk Density (Db)
15-bar plate (1.5 inch cores)Unavailable waterAvailable water
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General TrendsGeneral Trends
ShrinkAged 5.63 mmFresh 0.08 mm
Total porosity remained constant
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Year 1Year 1
0
20
40
60
80
100
0 3 6 12 0 3 6 12
Per
cen
t vo
lum
e
FreshAgedTime (months)
46%»29%
59%»50%
Air Space (AS)
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Per
cen
t vo
lum
e
FreshAged
Time (months)
42%»58%
27%»34%
Container Capacity (CC)
Year 1Year 1
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Year 2Year 2P
erce
nt
volu
me
FreshAged
Time (months)
47%»59%
34%»47%
Container Capacity (CC)
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Year 2Year 2P
erce
nt
volu
me
FreshAged
Time (months)
Up to 80% unavailable water
Container Capacity (CC)
Up to 60% unavailable water
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Corresponding Research
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Dougals fir bark (<3/8 in) (DFB) with:•0, 15, 30, 45% (by vol.) screened pumice•0, 15, 30, 45% (by vol.) sphagnum peat
Chemical Amendments•15-9-12 CRF•Dolomite + Micromax
Physiochemical Analysis•Porometer •Particle size•Pourthru (pH and EC)
Material & Methods
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o2 (taxa) x 7 (substrate treatments)
oRandomized complete block design
oWeigela florida 'Polka' and Azalea ‘Girard’s Fuchsia’
o4 containers per 4 replications
o2 gallons containers
Material & Methods
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Crop Response•Root and shoot dry weight•60 and 120 days
Water Relations•Water use efficiency of productivity•Water use efficiency of photosynthesis•Leaf area and length
Material & Methods
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Initial physical properties
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Initial physical properties
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Initial physical properties
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Initial physical properties
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Weigelia crop response
Peat
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Weigelia crop response
Peat Peat Pumice
Percent addition (by vol.)
Dry
weig
ht
(g)
Significant (p < 0.05 ) linear and quadratic response for peat and pumice, respectively
peat vs pumice **bark vs peat **bark vs pumice NS
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45%
Control(100% DFB)
Percent addition (by vol.)30%15%
Pu
mic
eP
eat
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Water applied to Weigelia (0.2 LF)
Significant (p < 0.05 ) linear response for peat.
Peat Pumice
Percent addition (by vol.)
Wate
r ap
plied
(L)
peat vs pumice **bark vs peat **bark vs pumice NS
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Weigelia water status as ƒ(leaf length)
*Significant (p < 0.05 ) linear and quadratic response for peat and pumice, respectively
Peat Pumice
Percent addition (by vol.)
peat vs pumice NSbark vs peat **bark vs pumice **
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Azalea crop response
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Azalea crop response
Peat Peat Pumice
Percent addition (by vol.)
Dry
weig
ht
(g)
peat vs pumice NSbark vs peat **bark vs pumice NS
Significant (p < 0.05 ) linear response for peat.
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Azalea water use efficiency (WUE)
Peat Pumice
Percent addition (by vol.)
WU
E (
g m
L-1)
peat vs pumice NSbark vs peat **bark vs pumice NS
Significant (p < 0.05 ) linear response for peat.
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45%
Control(100% DFB)
Percent addition (by vol.)30%15%
Pu
mic
eP
eat
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Significance to IndustrySignificance to IndustryLinear increase in air space and
container capacity (0.6 to 1.3% vol. month-1)
Water Management
(0.2L to 0.5L per 3.8L cont.)
Growth appears to correlate
with available water
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Jim Owen: 503.678.1264 or [email protected] Owen: 503.678.1264 or [email protected]