Download - Biochar for Sand-Based Root-Zone Modification NICK CHRISTIANS SHANE BROKHOFF IOWA STATE UNIVERSITY
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Biochar for Sand-Based
Root-Zone Modification
NICK CHRISTIANSSHANE BROKHOFF
IOWA STATE UNIVERSITY
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BIOCHAR AND TURF
Sand-based turfgrass root-zoneUnited States Golf Association
(USGA)
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BIOCHAR AND TURF turfSand-based turfgrass root-
zoneUnited States Golf Association (USGA)
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Why biochar and turf…
Root-zone mix
Intermediate layer
Coarse gravel
Drainage tile
(USGA, 1993)
sand:peat moss 90:10 or 80:20
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OBJECTIVES
Sand and biochar root-zone mix:
soil water retention properties
saturated hydraulic conductivity
rooting depth of creeping bentgrass
(Agrostis stolonifera L.)
chemical properties
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• switchgrass (Panicum virgatum
• FAST PYROLYSIS• Center for Sustainable
Environmental Technologies (CSET) at Iowa State University
BIOCHAR
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• Six volume-to-volume mixtures of biochar and sand
Treatments
Treatment Sand : Char
1 100 : 0
2 95 : 5
3 90 : 10
4 85 : 15
5 80 : 20
6 75 : 25
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0 5 10 15 20 250.00
0.05
0.10
0.15
0.20
0.25
0.30
f(x) = 0.00716571428571428 x + 0.0916285714285717R² = 0.970126215683793
Plant Available Water of Six Biochar and Sand Mixtures (n=4)
Percentage biochar (v/v)Pla
nt
av
ail
ab
le w
ate
r (c
m3
cm
-3)
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0 5 10 15 20 250
20
40
60
80
100
120
100
65 62
34
198
f(x) = − 3.59059188137078 x + 92.766628105266R² = 0.959532464145078
Percentage biochar (v/v)
Ks
at
(cm
hr-
1)
Ksat of Six Biochar and Sand Treatment Mixtures (n=4)
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• Leachate
– Electroconductivity (EC)
– pH
– Total organic carbon (TOC)
– Nutrient analyses
• Soil
– Nutrient analyses
Chemical properties
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LEACHATE pHpHpH
(-lo
g [H
+])
7.4
7.6
7.8
8.0
8.2
8.4
8.6
8.8
0 5 10 15 20 25 Biochar percentage (v/v)
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P (
ppm
)
0
2
4
6
8
0 5 10 15 20 25 Biochar percentage (v/v)
LEACHATE P
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Soil KK
(pp
m)
0
200
400
600
800
1000
1200
0 5 10 15 20 25 Biochar percentage (v/v)
LEACHATE K
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• Biochar increases soil water retention
• Biochar decreases saturated hydraulic conductivity
• Biochar decreases rooting depth of creeping bentgrass in media containing more than 10% (v/v) biochar
• Biochar increases leachate EC, TOC; provides essential nutrients
Conclusions