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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. 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

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  1. Soybean Tolerance to Flooding by Variety & Stage of Growth G. Stevens, M. Rhine, G. Shannon and D. Sleper Univ. of Mo-Delta Center

  2. Soybean varieties after flooding

  3. 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

  4. Hand planted in hills Plots flood 2 wks, rated, flooded 2 wks, rated

  5. Most tolerant in 2002/2003

  6. 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

  7. Growth Stage/Flood Duration Matthew Rhine P94B73, Manokin, DKB 4868, Mersch-Denver, Delsoy 4710

  8. Visual symptoms

  9. Similar results Wet midseason Four test years • Reelfoot silt loam 2003 • Reelfoot silt loam 2003 • Sharkey clay 2003 • Sharkey clay 2004

  10. 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

  11. Flood Duration (Dur) Loam 2003, 2004, Clay 2003

  12. Roots in Flooded Soil Coffeeweed Sesbania exaltata Soybean

  13. 2004 Clay Bloom Stage Yield, bu acre-1 DeltaKing 4868 Pioneer 94B73 Mersch-Denver Manokin Delsoy 4710

  14. Flood Duration (Dur) Clay 2004

  15. Growth Stage Interactions

  16. Growth Stage Flooded 192 hours Hurt Not hurt Lowest Lowest Yields followed by same letter were not significant at 0.05 level.

  17. Growth Stage Flooded 192 hours Lowest Lowest Not hurt Not hurt

  18. 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.

  19. 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.

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