1. Nitrogen Management Experiences in the Rainfed Corn Belt (Iowa)

2. Nitrogen Management Decisions Soil Tests Yield Goal Last Year’s Application Rate

3. Improving N Fertilization Field scale N responses Water-N interactions

4. Image process NDVI (B4 - B3) / (B4 + B3) Simple Ratio SAVI (Soil adjusted vegetation index) MSAVI (Modified Soil adjusted vegetation index) NPCI Normalized Pigment Chlorophyll ratio Index RS Index well correlated with Yield and or Chlorophyll content

5. Yield Correlation with RS data SAVI 3 rd flight SAVI 4 th flight

6. R3 SPAD means, Aug. 01, 2002

7. Exploratory Research Assessment of field-scale N responses Remote sensing of N variation in the field Field-scale decision processes incorporating soils, water, and N

8. Coon Rapids Smoothed Yields

9. Coon Rapids – September NDVI Field variation induced by previous management

10. Correlation Yields & Red/Green

11. Coon Rapids - Correlations Correlations prior to development of yield polygons

12. Coon Rapids – Red/Green Variability

13. Dallas South Field EMI Map Smoothed Yields Red/Green Index

14. Yield-Spectral Indices Correlated by yield polygons Dallas-South

15. Dallas South – Red/Green Variability