Long-Term Yields - PowerPoint PPT Presentation

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Long-Term Yields

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  1. 34 bu/A Yield (bu/A) 21 bu/A Year Long-Term Yields

  2. 0.56 bu/A/yr Yield (bu/A) 0.27 bu/A/yr Year Yield Increases

  3. Soybean Recommendationsfor 2002

  4. Soybean Information Database http://www.clemson.edu/edisto/soybean/soybean.htm

  5. Topics Variety Selection Tillage Drilled vs. Wide Rows Nematode Management Weed Management

  6. Variety Selection

  7. Multiple Location Yield Data -2001 (Irrigated and Dryland Trials at Blackville & Irrigated Trial at Florence) Variety Yield (bu/acre) Variety Yield (bu/acre) * Yield differences larger than 4.9 bu/A are assumed to be real with 90% confidence.

  8. Florence, Dryland – 2001 (Peanut Root-knot) Variety Yield (bu/acre) Variety Yield (bu/acre) * Yield differences larger than 3.0 bu/A are assumed to be real with 90% confidence.

  9. Blackville, Irrigated – 2001 (Soybean Cyst R3 & 14) Variety Yield (bu/acre) Variety Yield (bu/acre) * Yield differences larger than 8.6 bu/A are assumed to be real with 90% confidence.

  10. Tillage

  11. No-Till = No Yield

  12. Subsoiled 14 inch depth 16 inches 8 inches No-Till

  13. Drilled vs. Wide Rows

  14. For double-cropped soybeans, a 10 to 15% yield increase from drilled rows can be expected. Drilled Wide Drilled Wide Drilled Wide 1 WAE 4 WAE 7 WAE

  15. Relationship Between Soybean Groundcover and Yield % Groundcover Hypothetical Yield (bushels/acre)

  16. Drill Seed Double-Cropped Soybeans!! (NK S73-Z5 - 2001) 42 32 Yield (bu/acre) 38-inch row 7.5-inch row

  17. Nematode Management

  18. Soybean Cyst R3 & R14 - 2001 41 35 24 20 Yield (bu/acre)

  19. Peanut Root-Knot - 2001 19 15 10 Yield (bu/acre) 6

  20. Weed Management

  21. 26 oz/acre Roundup UltraMax @ 28 DAE Don’t delay applying Roundup!

  22. 6 oz/A Canopy @ planting 26 oz/A Roundup UltraMax @ 28 DAE

  23. Single Roundup Application vs. Soil-Applied Herbicide fb Roundup26 oz/acre Roundup UltraMax, 38-inch rows 40 33 Yield (bu/acre) Rdp @ 28 DAE Canopy followed by Rdp @ 28 DAE

  24. Sequential Roundup Applications vs. Soil-Applied Program 26 oz/acre Roundup UltraMax, 38-inch rows 40 39 Yield (bu/acre) Python + Dual II Magnum followed by Rdp @ 28 DAE Rdp @ 14 DAE followed by Rdp @ 28 DAE

  25. Weed Removal Timing 49% 21% 17% 2.5 (Assumed 30 bushel yield potential) Roundup UltraMax + Application Costs = $14.00/acre = 2.5 bu/acre Yield Loss (bu/acre) Weeks after Soybean Emergence

  26. Weed Management in Drilled Roundup Ready Soybeans • Roundup at 2 to 3 WAE; Note:Tank-mix with 0.15 oz/A FirstRate or 0.33 oz/A Classic if morningglories are larger than 4 inches. • Repeat application 14 days later if needed

  27. Weed Management in Wide-Row Roundup Ready Soybeans - Option 1 • Soil-applied herbicide at planting • Roundup 5 to 6 WAE - Option 2 • Roundup 2 WAE • Roundup 14 to 21 days later

  28. Weed Management in Conventional Soybeans • Drilled (7.5-inch rows) • Soil-applied herbicide(s) at planting specific for weed spectrum • Postemergence herbicide(s) at 4 WAE if needed • Wide Rows (30- to 38-inch rows) • Same as above, except postemergence herbicide must be applied.

  29. Recommendations Choose a variety based on nematode resistance in addition to yield potential. Deep tillage is essential on Coastal Plains soils. Drill seed double-cropped soybeans.

  30. Recommendations Apply 5 lbs/acre Temik in conjunction with a nematode- resistant variety in nematode infested fields. Apply postemergence herbicides in a timely manner.

  31. Questions? Bountiful 2002 Harvest!

  32. Horry County Soybean Variety Demonstration - 2001 Variety Yield (bu/acre) Variety Yield (bu/acre) Conducted by Bruce Johnson

  33. Blackville, Dryland – 2001 (Columbia lance) Variety Yield (bu/acre) Variety Yield (bu/acre) * Yield differences larger than 9.2 bu/A are assumed to be real with 90% confidence.

  34. Blackville, Irrigated - 2001 Variety Yield (bu/acre) Variety Yield (bu/acre) * Yield differences larger than 10.1 bu/A are assumed to be real with 90% confidence.

  35. Florence, Irrigated – 2001 Variety Yield (bu/acre) Variety Yield (bu/acre) * Yield differences larger than 5.1 bu/A are assumed to be real with 90% confidence.

  36. Blackville, Dryland – 2001 Variety Yield (bu/acre) Variety Yield (bu/acre) * Yield differences larger than 9.2 bu/A are assumed to be real with 90% confidence.

  37. Richland/Lexington Conventional Soybean Variety Demonstration - 2001 Variety Yield (bu/acre) Conducted by John Oxner