Dave Franzen – North Dakota State University

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Presentation transcript:

Interactions of Nitrogen Management Strategy with Corn Hybrid and Population Dave Franzen – North Dakota State University Newell Kitchen – USDA-ARS, Columbia, MO Laura Stevens, Richard Ferguson – University of Nebraska-Lincoln

Questions Is the use of crop canopy sensors for in-season N management influenced by hybrid or plant population? What are the interactions among N rate strategy, corn hybrid and population across this region? How do two different N rate recommendation strategies (sensor vs. model) compare across a broad region?

Locations High yield potential and moderate yield potential sites in each state

Nitrogen Rate Strategies Sensor: Holland Scientific RapidScan (3 band: red, red-edge, NIR); Schepers/Holland algorithm for N rate calculation (Holland & Schepers, Agronomy Journal 2010). Model: Maize-N (Setiyano, et al., Agronomy Journal 2011); based on the Hybrid-Maize crop growth model; use of local, historic weather data. Base N rate 0-75 lb/acre, depending on site (applied at or prior to planting). In-season N applied immediately after sensing at V9-V10 growth stage.

Treatments Hybrid: High drought tolerance, low drought tolerance. Population: moderate (24-32,000 plants/acre) or high (31-42,000 plants/acre). Nitrogen rate: unfertilized check, high N reference, Maize-N model rate, canopy sensor rate. Location: Missouri, Nebraska and North Dakota, each state with high yield and moderate yield potential sites.

Vegetation Indices and Nitrogen Rate Missouri

Vegetation Indices and Nitrogen Rate Missouri

Vegetation Indices and Nitrogen Rate Nebraska

Vegetation Indices and Nitrogen Rate Nebraska

Vegetation Indices and Nitrogen Rate North Dakota

Vegetation Indices and Nitrogen Rate North Dakota

Sufficiency Index – Post-Fertilization

Change in NDRE Relative to N Applied ΔNDRE/lb N