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Three Alternative Nitrogen Management Strategies for Cereal Grain Production

Three Alternative Nitrogen Management Strategies for Cereal Grain Production. Brian Arnall Plant and Soil Sciences Department Oklahoma State University. Introduction. Scrutiny of Nitrogen Application Environmental impact Rise in Fuel and Nitrogen cost Temporal Variability

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Three Alternative Nitrogen Management Strategies for Cereal Grain Production

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  1. Three Alternative Nitrogen Management Strategies for Cereal Grain Production Brian Arnall Plant and Soil Sciences Department Oklahoma State University

  2. Introduction Scrutiny of Nitrogen Application Environmental impact Rise in Fuel and Nitrogen cost Temporal Variability What Nature Provides Unpredictable Variables

  3. Response Index

  4. N-Rich Strip • The Nitrogen Rich Strip: • What is it? • When and Where can it be used? • Ease of application • Drive by visibility

  5. N-Rich Strip • Yes or No

  6. N-Rich Strip Sensor Based Nitrogen Rate Calculator Using Sensor Data and the Nitrogen Fertilizer Optimization Algorithm, N-Rates are prescribed for that field and its condition.

  7. Nitrogen Fertilizer Optimization Algorithm Aug 16, 2002 Aug 28, 2002 1. Establish preplant N Rich Strip(NRS) 4. Determine Response Index (RI)2. NDVI (biomass) =NDVINRS/NDVIFarmer3. Predict potential yield 5. Predict potential grain yield need # of days from planting to (YP0) with added N, YPN =(YP0*RI) sensing (INSEY = biomass prod./day) 6. Fertilizer Rec = (grain N uptake INSEY vs. Yld eqn. YPN – grain N uptake YP0/0.7) CORN YPN May June August RI NDVI (sensing date) YP0 Planting date days from planting to sensing (GDD>0) WHEAT November March June

  8. Ramp Calibration Strip • The Ramp Calibration Strip • 16 N rates • 0 – 195 lb N ac-1 (can be adjusted for other crops) • Rate Interval 10 ft (adjustable) • Truck or ATV mounted

  9. Ramp Calibration Strip • Walk it off 0 N 195 N

  10. Ramp Calibration Strip • Sensor Based

  11. Strip Alternatives

  12. VRT • Variable Rate N Application • Resolution • Wheat .4 m2 • Corn By-Plant

  13. VRT Equipment

  14. VRT Equipment

  15. Questions? For More Informationwww.nue.okstate.edu

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