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Knowing what the Crop Needs

Knowing what the Crop Needs. Nitrogen Recommendations For Most Situations. Corn 120-160 lb/a* Soybeans 0 lb/a Winter Wheat 70 lb/a *Increase by 30 lbs/a if greater than 50% residue. UW Nitrogen Recommendations for Corn Are Based On:. Soil yield potential Soil texture (sands vs. others)

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Knowing what the Crop Needs

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  1. Knowing what the Crop Needs

  2. Nitrogen RecommendationsFor Most Situations Corn 120-160 lb/a* Soybeans 0 lb/a Winter Wheat 70 lb/a *Increase by 30 lbs/a if greater than 50% residue

  3. UW Nitrogen Recommendations for Corn Are Based On: Soil yield potential Soil texture (sands vs. others) Soil organic matter content Irrigation - NOT CORN YIELD GOAL -

  4. Corn Nitrogen Recommendations - Prior to 2006 - SoilMedium & Fine Sandy Soils Organic Textured Soils Matter Yield Potential Non-irrigated Irrigated Low/Med. High/V. High - - - % - - -- - - - - - - - lbs N/acre to apply - - - - - - - - < 2 150 180 120 200 2.0-9.9 120 160 110 160 10-20 90 120 100 120 >20 80 80 80 80

  5. Corn yield response to nitrogen

  6. Economic Optimum N Rate =

  7. As N rates are increased to the economic optimum: Economic return increases Crop recovery of N decreases Potential for N loss increases

  8. Price Adjusted N Guidelines for Corn- 2006 Revisions - Maximum Return to N (MRTN) Flexibility in rates based on economics Cost of N Price of corn Cropping systems approach Corn after soybeans, small grains Corn after corn, forage legumes, green manures, etc. Multi-state, regional approach WI, IA, IL, MN, OH, IN, MI New

  9. Price Adjusted N Guidelines for Corn - Medium & Fine-Textured Soils - 1 Maximum return to N (MRTN) rate. 2 Within $1/a of MRTN rate. 3 Total N to apply, includes N in starter, herbicides, etc. 4 Subtract N credits for forage legumes, legume vegetables, animal manures, green manures. 5 Subtract N credits for animal manures and second year forage legumes.

  10. Price Adjusted N Guidelines for Corn - Sandy Soils - 1 Maximum return to N (MRTN) rate. 2 Within $1/a of MRTN rate. 3 Total N to apply, includes N in starter, herbicides, etc. 4 Subtract N credits for forage legumes, legume vegetables, animal manures, green manures.

  11. Range in Profitable N Rates at Various Price Ratios • * = MRTN • = + $1.00 MRTN

  12. Nitrogen:Corn Price Ratios 0.10 0.15 0.20 1 Price of N = [$/ton fertilizer x (100 / % N in fertilizer)] / 2000

  13. Target pH for Common Crops

  14. Crop Nutrient Removal P2O5 K2O - - - - - - - lb/a/yr - - - - - - Corn (160 bu/a) 60 45 Corn silage (23 ton/a) 85 135 Soybean (40 bu/a) 35 40 Alfalfa (5 ton/a) 65 250 Winter Wheat (90 bu/a) 45 32 *recommended application rate

  15. Another way to look at it

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