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Greg Schwab, Extension Soil Specialist UK Department of Agronomy

Nitrogen, Phosphorus, Potassium, and Micronutrients. 2006 Early Management Decisions Meeting “Helping the producer decide what inputs to purchase.”. Greg Schwab, Extension Soil Specialist UK Department of Agronomy. “Current” Fertilizer Prices. Nitrogen Recommendation for Corn.

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Greg Schwab, Extension Soil Specialist UK Department of Agronomy

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  1. Nitrogen, Phosphorus, Potassium, and Micronutrients 2006 Early Management Decisions Meeting “Helping the producer decide what inputs to purchase.” Greg Schwab, Extension Soil Specialist UK Department of Agronomy

  2. “Current” Fertilizer Prices

  3. Nitrogen Recommendation for Corn *1. Corn, Sorghum, Soybean, Small grain, set-aside 2. Grass, Grass-legume sod (4yrs or less) w.a. leg. 3. Grass, grass-legume sod (5yrs or more)

  4. Previous Crop No-till Corn Response to Nitrogen (1992-1994) Lexington Previous Crop

  5. Corn Yield Response to Fertilizer Nitrogen Kentucky 2001-2006 Well Drained Soils `

  6. Henderson County 2001 P. Crop Soybean Soil Series Fayala 250 0.7 lbs N/bu 1.2 lbs N/bu 2 R =0.9517 Agronomic Optimum N Rate 200 Economic Optimum N Rate Price Ration 0.1 150 Yield (bu/a) 100 50 0 0 50 100 150 200 250 300 350 400 Nitrogen Rate (lbs/a)

  7. Nitrogen Recommendation for Corn *1. Corn, Sorghum, Soybean, Small grain, set-aside 2. Grass, Grass-legume sod (4yrs or less) w.a. leg. 3. Grass, grass-legume sod (5yrs or more)

  8. Yield and Economic Return to Nitrogen for Corn on Well Drained No-till Soils 2003-2005

  9. Yield and Economic Return to Pre-plant Nitrogen for Corn on Somewhat Drained No-till Soils 2003-2005

  10. Yield and Economic Return to Sidedress Nitrogen for Corn on Somewhat Poorly Drained No-till Soils 2003-2005

  11. Effects of NBPT on Corn Source: Southern Illinois University

  12. Hardin County N Source Study on Corn 2004 50 lbs N/a applied at planting Estimated Treatment N Rate N Source Yield N loss lbs/a bu/a % of sdress 1 0 Control 117d 0 2 50 Urea 158c 52 3 50 Urea + Agrotain 201b ( 8) 4 50 Super Urea 201b (8) 5 50 Polymer Coated Urea at Planting 177bc 22 6 50 UAN 150c 62 7 50 UAN + Agrotain 179bc 20 8 50 Stabilized UAN 175bc 24 9 50 Ammonium Nitrate 192b 0 10 130 Ammonium Nitrate 239a 0

  13. Polymer Coated Urea

  14. PCU on Corn

  15. Database analysis summaryESN yield benefit vs urea/UAN (Number of site means in matrix cell.)

  16. Database analysis summaryESN yield benefit vs urea/UAN

  17. Conclusions As N price increase, the cost of over fertilization increases Increase N price may justify switching sources or application methods Take steps to improve nitrogen use efficiency 1. Utilize manure if possible 2. Make timely N application 3. Conducted on farm strip trials

  18. P deficiency showing in older corn leaves

  19. K Deficiency

  20. “Current” Fertilizer Prices

  21. Micronutrients The effect of soil pH on the activity of soil micro-organisms, availability of plant nutrients, and occurrence of toxic elements

  22. Zinc Photo by: L. Murdock

  23. Corn

  24. Manganese on Soybean

  25. Micronutrient Fertilization of Soybeans Hardin Co

  26. Questions/Comments

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