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Optimizing Corn and Wheat Nutrient Recommendations

Learn about current corn and wheat nutrient recommendations from Kansas State University. Discover how to tailor your fertilizer usage based on yield goals, soil organic matter, and previous crop adjustments. Updated with recent field research and emphasis on Extension education tools.

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Optimizing Corn and Wheat Nutrient Recommendations

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  1. Current KSU N recommendations for corn & wheat John Schmidt Alan Schlegel Kansas State University

  2. Development of current N recommendations • Based on historical recommendations / concepts • Modified to include soil N “mineralization potential” • “Loosely” updated with more recent field research results • Emphasis on Extension education tool

  3. Corn N recommendation • N rec = • (Yield Goal x 1.6) – (SOM x 20) – Profile N – Manure N – Irr. Water N + Previous crop adj. • Yield goal, bu acre-1 • Soil organic matter, % • Profile soil N test, lb acre-1, 0-2 ft, (0.3 x sampling depth, inches x NO3-N, ppm) • Manure N applied, lb acre-1 • Irrigation water N applied, lb acre-1 • Previous crop adjustment, lb acre-1

  4. Corn N recommendation, STN = 30 lb N acre-1 Soil OM, % N rec = (Yield Goal x 1.6) – (SOM x 20) – Profile N – Manure N – Irr. Water N + Previous crop adj.

  5. KSU’s rec, 218 lb acre-1 Corn yield response,Tribune, KS (92-00) P2O5, lb acre-1 source: Alan Schlegel

  6. KSU’s rec, 226 lb acre-1 Corn yield response,Topeka, KS (97-01) P2O5, K2O, lb acre-1 source: Larry Maddux

  7. KSU’s rec, 314 lb acre-1 Corn yield response,Scandia, KS (01, Ridge-till) P2O5, K2O, S lb acre-1 source: Barney Gordon

  8. Wheat N recommendation • N rec = • (Yield Goal x 2.4) – (SOM x 10) – Profile N – Manure N + Previous crop adj. + Tillage adj. + Grazing adj. • Yield goal, bu acre-1 • Soil organic matter, % • Profile soil N test, lb acre-1, 0-2 ft, (0.3 x sampling depth, inches x NO3-N, ppm) • Manure N applied, lb acre-1 • Previous crop adjustment, lb acre-1 • Tillage adjustment, 20 lb acre-1 for no-till • Grazing adjustment, 40 lb acre-1 per 100 lb beef weight gain

  9. Wheat N recommendation, STN = 30 lb N acre-1 Soil OM, % N rec = (Yield Goal x 2.4) – (SOM x 10) – Profile N – Manure N + Previous crop adj. + Tillage adj. + Grazing adj.

  10. KSU’s rec, 82 and 88 lb acre-1 Wheat yield response,Manhattan, KS (98-00) source: Dave Whitney

  11. KSU’s rec, 144 lb acre-1 Wheat yield response,Hesston, KS (99, 01) source: Mark Claassen

  12. KSU’s rec, 124 and 108 lb acre-1 Wheat yield response,Hutchinson, KS (96-01) source: Bill Heer

  13. KSU’s rec, 136 lb acre-1 Wheat yield response,central KS (98-00), 11 site-years source: Ray Lamond

  14. Inject NO3-N, 55 lb acre-1 Broadcast NO3-N, 21 lb acre-1 Wheat yield response,Tribune, KS (94-97), 13 site-years source: Alan Schlegel

  15. Optimal N for wheat,Tribune, KS (94-97), 13 site-years source: Alan Schlegel

  16. Is an average N recommendation adequate? • Sometimes it’s ok

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