Transcript Extension Crop Management Programs in Southeast Missouri

Soybean Tolerance to Flooding by
Variety & Stage of Growth
G. Stevens, M. Rhine,
G. Shannon and D. Sleper
Univ. of Mo-Delta Center
Soybean varieties after flooding
Three flood tolerance tests
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Test 1- Screened soybean germplasm/cultivars
Test 2- Tolerance by growth stage (Group IV)
Test 3- Tolerance by flood duration (Group IV)
Investigators: G. Shannon, G. Stevens, M. Rhine, B. Wiebold
Hand planted in hills
Plots flood 2 wks, rated, flooded 2 wks, rated
Most tolerant in 2002/2003
Group IV
Group V
Hornbeck HBK R4920
Armor 52-C2
MFA Morsoy RT 4809
Armor 53-K3
NK S49-Q9
Delta King 5668 RR
P94B13
Golden Harvest H5492
P94B73
MFA RT5442 N
Southern Cross Titus
Vigoro V 562 N RR
Stine 4202
Average yield of the most tolerant, least tolerant and 30 varieties
averaged over three maturity groups under flooded & non-flooded.
60
53.3
Yield, Bu/A
50
51.6
39%
less
50.5
61%
less
77%
less
40
32.4
30
19.8
20
12.0
10
NF
0
F
Most Tolerant
NF
NF
F
Least Tolerant
F
Mean–30 Var.
Shannon, Stevens, and Wiebold 2003
Growth Stage/Flood Duration
P94B73, Manokin, DKB 4868, Mersch-Denver, Delsoy 4710
Matthew Rhine
Visual symptoms
Four test years
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Reelfoot silt loam 2003
Reelfoot silt loam 2003
Sharkey clay 2003
Sharkey clay 2004
Similar results
Wet midseason
Flooded at Bloom Growth Stage
DeltaKing 4868
60
Loam 2003, 2004,
Clay 2003
55
50
45
40
35
30
0
48
96
144
192
Flood Duration, hrs
Averaged across environments
Flood Duration (Dur)
Loam 2003, 2004,
Clay 2003
Soybean variety Flood response
Bu= 51.3 + 0.28 Hr –0.0023 Hr2
R2=0.97
Pioneer P94B73 Bu= 47.9 + 0.14 Hr –0.0012 Hr2
R2=0.91
Manokin
Bu= 52.3 - 0.06 Hr
R2=0.80
Mersch-Denver
Bu= 45.3 + 0.05 Hr –0.0008 Hr2
R2=0.93
Delsoy 4710
Bu= 39.2 + 0.10 Hr –0.0009 Hr2
R2=0.78
DeltaKing 4868
Plateau 144 hr
Plateau 144 hr
Plateau 144 hr
Plateau 144 hr
Roots in Flooded Soil
Coffeeweed
Sesbania exaltata
Soybean
2004 Clay Bloom Stage
40
35
30
25
20
15
10
5
0
0
48
96
Flood Duration, hrs
144
192
Flood Duration (Dur)
Clay 2004
Soybean variety Flood response
Bu= 36.4 - 0.35 Hr +0.0012 Hr2
R2=0.93
Pioneer P94B73 Bu= 19.7 - 0.14 Hr +0.0004 Hr2
R2=0.98
Manokin
Bu= 36.6 - 0.47 Hr +0.0017 Hr2
R2=0.92
Mersch-Denver
Bu= 21.2 - 0.24 Hr +0.0009 Hr2
R2=0.90
Delsoy 4710
Bu= 34.9 - 0.43 Hr +0.0016 Hr2
R2=0.96
DeltaKing 4868
Growth Stage Interactions
Effect
Probability>F
Growth stage
0.007
Variety X G stage
0.002
Year X Soil X Var X G stage
0.085
Growth Stage Flooded 192 hours
Variety
Delsoy 4710
Least tolerant
DeltaKing 4868
Most tolerant
Growth stage
Check
V5
Loam &Clay 03
38 b
50 a
Bloom
R5
Check
V5
33 b Hurt
30 b Lowest
47 a
44 ab
Bloom
R5
51 a Not hurt
35 b Lowest
Yields followed by same letter were not significant at 0.05 level.
Growth Stage Flooded 192 hours
Variety
Delsoy 4710
Least tolerant
DeltaKing 4868
Most tolerant
Growth stage
Check
V5
Clay 04
36 a
16 b
Bloom
R5
Check
11 b Lowest
30 ab Not hurt
38 a
V5
Bloom
R5
19 b
18 b Lowest
47 a Not hurt
Discussion
•Least tolerant varieties yield decline at 48 hrs.
•Tolerant varieties withstood 96 hrs flooding.
•Most injury to flooding was usually late season.
•Root morphology may be key to tolerance.
Bottom Line
•Irrigation management- Get soil profile watered
up before going into late reproductive stages
• Soybean genetics- Use most tolerant
germplasm in crosses, select individual plants
with desired root morphology, consider moving
root genes from coffeeweed into soybean.