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Agronomic Implications of Soybean Rust Shawn P. Conley Ellsworth Christmas Purdue University Soybean Production Systems

Agronomic Implications of Soybean Rust Shawn P. Conley Ellsworth Christmas Purdue University Soybean Production Systems. 2005 Soybean Production Q & A. Should I plant soybean earlier? Should I plant an earlier maturing cultivar? Should I modify my row spacing & seeding rate?.

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Agronomic Implications of Soybean Rust Shawn P. Conley Ellsworth Christmas Purdue University Soybean Production Systems

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  1. Agronomic Implications of Soybean Rust Shawn P. Conley Ellsworth ChristmasPurdue UniversitySoybean Production Systems

  2. 2005 Soybean Production Q & A • Should I plant soybean earlier? • Should I plant an earlier maturing cultivar? • Should I modify my row spacing & seeding rate?

  3. 2005 Soybean Production Q & A • Should I plant all corn in 2005? • Will rust affect double crop beans more than the full season varieties? • Can I tank mix glyphosate with a fungicide?

  4. Should I Plant Soybean Earlier in 2005?

  5. Floral initiation • Photoperiod: Short day/critical value to initiate floral induction • Temperature regulates when flowers appear

  6. Effect of Early Planting Date on Soybean Yield, Davis PAC, 1991 ↓ 21%

  7. Effect of Early Planting Date on Soybean Yield, SEPAC, 1991 ↓ 31% ↓ 21% ↓ 4%

  8. Effect of Early Planting Date Soybean Yield, SEPAC, 1992 ↓ 24% ↓ 7%

  9. Soybean Yield Response to Planting Date 1991-94

  10. Soybean Yield Response to Planting Date 1991-94

  11. Should I Plant an Earlier Maturing Cultivar in 2005?

  12. Effect of Maturity on Yield 2004 UI Variety Testing

  13. Implications for Early Variety • Matured an average of 9 days earlier • Average 4.5% yield loss • 3 bushel yield loss @ $5.00 to $6.00 • $15.00 to $18.00 for a fungicide application • Risk assessment: 9 days vs. $18.00

  14. Should I Modify My Row Spacing and Seeding Rate?

  15. 8% ↓ 3% ↓

  16. Wheel Traffic Effect on Soybean Yield Piper, Swearingin, Nyquist. 1989.

  17. Increased Income Compared to Increased Seed Cost for Solid Seeded Soybeans

  18. Increased Income Compared to Increased Seed Cost for Solid Seeded Soybeans

  19. Should I Plant all Corn in 2005?

  20. Corn Yield Response to Tillage and Rotation from 1975 to 2004 in West Lafayette, IN (Chalmers silty clay loam) T.D. West, T.J. Vyn, G. Steinhardt

  21. Corn Yield Response to Tillage and Rotation from 1997 to 2004 in Wanatah, IN (Sebewa loam) T.D. West, T.J. Vyn, G. Steinhardt

  22. Factors to Consider in Continuous Corn • Yield loss (11 to 23 bushels in 2004) • Higher tillage costs: No-till ineffective • Associated higher soil erosion costs • Higher optimum N rates (≥ 40 units N) • Pest control may now be a wash T.D. West, T.J. Vyn, G. Steinhardt

  23. Will rust affect double crop beans more than the full season varieties?

  24. 10 8 5 3 Average Date For the Start of Wheat Harvest July June 30 28 26 24 22 21 20 19 18

  25. Average Indiana Soybean Development

  26. Increased Double Crop Risk? • Vegetative versus reproductive stage • Increased risk of early infection • Multiple applications may be required • Open canopy and airflow considerations? • Yield potential versus increased risk?

  27. Can I Tank Mix Glyphosate With a Fungicide?

  28. Factors to Consider • Drift and Nozzle Selection • Droplet size and Pressure • Herbicide: > 400 μm and low pressure • Fungicide: < 220 μm and higher pressure • Timing: Herbicide vs. fungicide • Glyphosate: 4 to 6” for annuals; 6 to 12 perennials; up to 50% bloom • Fungicide: R1 and later • Label Issues: Tank mix partners? Vague Fungicides, Herbicides, and Soybean Rust, Do they Mix?

  29. Questions?conleysp@purdue.edu

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