Soils Data Summary. Stormwater Management: LID Practices | 2 Soil Phosphorus Levels.
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Transcript of Soils Data Summary. Stormwater Management: LID Practices | 2 Soil Phosphorus Levels.
Soils Data Summary
Stormwater Management: LID Practices | 2
Soil Phosphorus LevelsSoil Phosphorus Levels
Stormwater Management: LID Practices | 3
Average Phosphorus Concentration in Soils by Catchment
0
50
100
150
200
250
A B C D E F G
Catchment
Me
hli
ch
-1 E
xtr
ac
tab
le P
, p
pm
Catchment Very Low Medium High Very High
A 33% 0% 56% 11%
B 0% 14% 29% 57%
C 14% 0% 29% 57%
D 0% 40% 20% 40%
E 0% 0% 0% 100%
F 0% 0% 40% 60%
G 29% 29% 14% 29%
Grand Haven 13% 10% 27% 50%
0%
10%
20%
30%
40%
50%
60%
Very Low Medium High Very High
Phosphorus Test Level
% o
f so
ils t
este
d
77% of soils tested do not need any phosphorus fertilizer
Stormwater Management: LID Practices | 5
Fill and Soil Quality Fill and Soil Quality
Fill MaterialpH = 7.3
leachable P = 77.7 + 52 ppm
Fill MaterialpH = 7.3
leachable P = 77.7 + 52 ppm
Native SoilpH = 5.0,
leachable P = 1.4 + 0.5 ppm
Native SoilpH = 5.0,
leachable P = 1.4 + 0.5 ppm
Common space landscaped soils pH = 7.3
Mehlich 1 P = 80.9 + 48 ppm
Common space landscaped soils pH = 7.3
Mehlich 1 P = 80.9 + 48 ppm
Residential landscape soils pH = 7.3
Mehlich 1 P = 93.5 + 34 ppm
Residential landscape soils pH = 7.3
Mehlich 1 P = 93.5 + 34 ppm
Stormwater Management: LID Practices | 6
Soil Phosphorus vs. Copper Sulfate Treatments
Soil Phosphorus vs. Copper Sulfate Treatments
Average Soil P Concentration vs. Copper Sulfate Treatments Between 2005-2008 by Catchment
y = 0.1907x + 13.316
R2 = 0.48020
5
10
15
20
25
30
35
40
45
0 20 40 60 80 100 120 140 160
Mehlich 1 Extractable P, ppm
Av
era
ge
nu
mb
er
of
Co
pp
er
Su
lfa
te T
rea
tme
nts
A
G
DB
F
C
E
Stormwater Management: LID Practices | 7
SummarySummary
• Soil phosphorus test indicates most soils do not require phosphorus fertilizer.
• Phosphorus levels in some fill soil are very high and significantly higher than native soil P.
• Soil phosphorus and frequency of copper sulfate treatments are weakly correlated.