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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. Test 1- Screened soybean germplasm/cultivars Test 2- Tolerance by growth stage (Group IV)

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soybean tolerance to flooding by variety stage of growth

Soybean Tolerance to Flooding by Variety & Stage of Growth

G. Stevens, M. Rhine,

G. Shannon and D. Sleper

Univ. of Mo-Delta Center

three flood tolerance tests
Three flood tolerance tests
  • 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

slide4

Hand planted in hills

Plots flood 2 wks, rated, flooded 2 wks, rated

slide6

Average yield of the most tolerant, least tolerant and 30 varieties averaged over three maturity groups under flooded & non-flooded.

39% less

77% less

61% less

NF

NF

NF

F

F

F

Most Tolerant

Least Tolerant

Mean–30 Var.

Shannon, Stevens, and Wiebold 2003

growth stage flood duration
Growth Stage/Flood Duration

Matthew Rhine

P94B73, Manokin, DKB 4868, Mersch-Denver, Delsoy 4710

four test years

Similar results

Wet midseason

Four test years
  • Reelfoot silt loam 2003
  • Reelfoot silt loam 2003
  • Sharkey clay 2003
  • Sharkey clay 2004
flooded at bloom growth stage
Flooded at Bloom Growth Stage

DeltaKing 4868

Loam 2003, 2004,

Clay 2003

Pioneer 94B73

Manokin

Mersch-Denver

Yield, bu acre-1

Delsoy 4710

Averaged across environments

flood duration dur
Flood Duration (Dur)

Loam 2003, 2004,

Clay 2003

roots in flooded soil
Roots in Flooded Soil

Coffeeweed Sesbania exaltata

Soybean

2004 clay bloom stage
2004 Clay Bloom Stage

Yield, bu acre-1

DeltaKing 4868

Pioneer 94B73

Mersch-Denver

Manokin

Delsoy 4710

growth stage flooded 192 hours
Growth Stage Flooded 192 hours

Hurt

Not hurt

Lowest

Lowest

Yields followed by same letter were not significant at 0.05 level.

growth stage flooded 192 hours17
Growth Stage Flooded 192 hours

Lowest

Lowest

Not hurt

Not hurt

discussion
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
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.