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Oat Response to Imazapic Residues

Oat Response to Imazapic Residues. E. P. Prostko, T.L. Grey, and R. N. Morgan Department of Crop & Soil Sciences University of Georgia Tifton. WSSA - 2005. Imazapic. trade named - CADRE BASF product labeled for peanut in 1996 postemergence nutsedges broadleaf small grasses

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Oat Response to Imazapic Residues

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  1. Oat Response to Imazapic Residues E. P. Prostko, T.L. Grey, and R. N. Morgan Department of Crop & Soil Sciences University of Georgia Tifton WSSA - 2005

  2. Imazapic • trade named - CADRE • BASF product • labeled for peanut in 1996 • postemergence • nutsedges • broadleaf • small grasses • very popular • 64% in GA • $15-16/A • rotation restrictions

  3. Cadre Rotational Restrictions

  4. Small Grains in GeorgiaPlanted Acres Source: GASS

  5. Materials and Methods - I • small plot techniques • 4 replications • imazapic @ 1.44 ozs/A applied to bare ground • first week of May, June, July , August, September • ‘Coker 227’ oats planted first week of October • 3 locations • no tillage after initial bed formation

  6. Materials and Methods - IIData Collected • stand counts • 1-2 WAP • forage yields • machine harvested in December and January • grain yields • machine harvested in May

  7. Soil Types

  8. Results

  9. The influence of imazapic on oat stand P = 0.60 Averaged over 3 tests

  10. The influence of imazapic on forage yield a a a ab b c LSD Averaged over 3 tests

  11. The influence of imazapic on grain yield P = 0.1476 Averaged over 3 tests

  12. Cadre Injury Symptoms

  13. CADRE/OATS TEST December 3, 2002 Untreated June 4 Aug 5 July 1 Sept 3 May 1 Oats planted October 2, 2002

  14. CADRE/OATS TEST January 21, 2003 Untreated June 4 Aug 5 Sept 3 May 1 July 1 Oats planted October 2, 2002

  15. Untreated Cadre 1 Month Before Planting Photo 21 DAP, Tifton 2003

  16. Summary • oat stand was not reduced by any timing of imazapic • oat forage yield reduced when imazapic was applied in August and September (1-2 months before planting) • oat grain yield was not reduced by any timing of imazapic

  17. Conclusions • the oat rotation restriction does not need to be 18 months • should be equivalent to other small grains (4 months)

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