Within Field Variation in Corn Response to N Fred Below Department of Crop Sciences University of Illinois at Urbana-Champaign.

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Presentation transcript:

Within Field Variation in Corn Response to N Fred Below Department of Crop Sciences University of Illinois at Urbana-Champaign

The Team

North South Average yield (bu acre -1 ) >120 Maurer 2002 Yield map

Prerequisites for Variable Rate N Areas of differing N response Easily identify variable areas Improve yield/reduce N use

Objective Determine the degree of variability within individual fields in their responsiveness to fertilizer N

Four farm fields near Beardstown, IL FieldAreaHybrid acres Allen 87P 31N27 Wilkey 60P 34H31 Maurer North 80P 34H31 Maurer South 80P 31N27

N treatments at Wilkey N rate (lb acre -1 )

N rate (lb acre -1 ) Sampling regions at Wilkey

Grain yield N rate (lb acre -1 ) Grain yield (bu acre -1 )

Grain yield (bu acre -1 ) at Maurer South

Grain yield N rate (lb acre -1 ) Grain yield (bu acre -1 )

Grain yield (bu acre -1 ) at Wilkey 400 Feet0 200

Grain protein (%) 400 Feet0 200 Wilkey

Grain yield (bu acre -1 ) 400 Feet0 200 Wilkey

Individual kernel weight (mg) 400 Feet0 200 Wilkey

Kernel number (no. m -2 ) 400 Feet0 200 Wilkey

What component drives yield Grain yield (bu acre -1 ) Kernel number (number m -2 ) Kernel weight (mg)

Conclusions Differing yield response to N within Farmers’ fields Variable applied N results in differing N availability Sink-driven yield response to N is a challenge for VRN