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Why Sensors May Not Be Appropriate for Minnesota

Why Sensors May Not Be Appropriate for Minnesota. Gyles Randall Univ. of Minnesota Southern Research and Outreach Center. NUE Workshop. Manhattan, KS. July 31, 2008. Challenges. Relatively high OM soils - capable of significant mineralization - delays NDVI discrimination (Algorithm)

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Why Sensors May Not Be Appropriate for Minnesota

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  1. Why Sensors May Not BeAppropriate for Minnesota Gyles Randall Univ. of Minnesota Southern Research and Outreach Center • NUE Workshop. Manhattan, KS. July 31, 2008

  2. Challenges • Relatively high OM soils - capable of significant mineralization - delays NDVI discrimination (Algorithm) • Rainfed agriculture • dry weather after SD limits N uptake • where are the roots? • MN BMP: apply SD N before corn is 12” tall (V7) • Split N application adds risk • Synchronizing technological diagnosis with agronomic response

  3. Average NDVI, RI, and EONR as affected by N rate across 8 sites for corn following soybeans in Minnesota.

  4. Average NDVI, RI, and EONR as affected by N rate across 6 sites for corn after corn in Minnesota.

  5. Corn yield responses with mid to late sidedress N applications in southern MN.

  6. Challenges (cont.) • OM and water availability • difficulty obtaining a representative N-rich strip! • Variability within field/catena • Other factors create differences in biomass • We assume N is the limiting factor • OM, soil moisture, S, etc. • Economics • Equipment, fertilizer, time

  7. Opportunities • A diagnostic tool to reduce N applc’n rates • limited value if using Univ. rate rec’s • A diagnostic tool to adjust N rates (manure) • may be most successful in highly variable fields • requires an intense spatial data base over multiple years • Combine yields, soil OM, soil tests, drainage, slope, RS data, daily weather data, planting date, etc. • develop an Adaptive Management Strategy

  8. Thanks Questions?

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