ksu 1

Information about ksu 1

Published on October 4, 2007

Author: Gallard

Source: authorstream.com

Content

Slide1:  Current KSU N recommendations for corn & wheat John Schmidt Alan Schlegel Kansas State University Slide2:  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 Development of current N recommendations Slide3:  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 Corn N recommendation Slide4:  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. Slide5:  source: Alan Schlegel Corn yield response, Tribune, KS (92-00) P2O5, lb acre-1 Slide6:  Corn yield response, Topeka, KS (97-01) P2O5, K2O, lb acre-1 source: Larry Maddux Slide7:  Corn yield response, Scandia, KS (01, Ridge-till) P2O5, K2O, S lb acre-1 source: Barney Gordon Slide8:  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 Wheat N recommendation Slide9:  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. Slide10:  source: Dave Whitney Wheat yield response, Manhattan, KS (98-00) Slide11:  source: Mark Claassen Wheat yield response, Hesston, KS (99, 01) Slide12:  source: Bill Heer Wheat yield response, Hutchinson, KS (96-01) Slide13:  source: Ray Lamond Wheat yield response, central KS (98-00), 11 site-years Slide14:  source: Alan Schlegel Wheat yield response, Tribune, KS (94-97), 13 site-years Slide15:  source: Alan Schlegel Optimal N for wheat, Tribune, KS (94-97), 13 site-years Slide16:  Sometimes it’s ok Is an average N recommendation adequate?

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