Missouri algorithm: Design

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Missouri algorithmDesign objectives
Peter Scharf Newell Kitchen, Ken Sudduth, Glenn
Davis, John Lory, Vicky Hubbard, Kent Shannon,
Harlan Palm

• Peter Scharf
• University of Missouri

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On the way here, I saw a lot of money laying on
the ground!!
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Missouri Algorithm Objectives

• Dont leave money laying on the ground
• Supply enough N to the crop to support full yield
• Dont apply N that the crop doesnt need
• Dont let N escape from fields to water

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Crop N need is variable

• Twenty on-farm N rate experiments in Missouri,
  corn after soybean, no manure
• Most profitable N rates were 109, 114, 175, 0,
  90, 190, 244, 63, 119, 300, 0, 146, 146, 180, 52,
  175, 112, 149, 136, 114 lb N/acre

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Crop N need is variable Missouri
lb/ac
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Crop N need is variable Minnesota
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Overapplication leftover N in soil
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Spatially intensive diagnosis is needed
How?
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Diagnosing where to put more N
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Sensor advantages over other color measurements

• Immediateno waiting, minimal interference from
  weather
• Works earlier than remote sensing
• Accuracy probably better than remote sensing
• Manages variability better than chlorophyll meter

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Missouri algorithm designJust an empirical
relationship

• John Lory and I initial calibration with
  Cropscan
• Newell Kitchen et al more recent field-scale
  calibration of Greenseeker and Crop Circle
• Multi-state (country) data from this group

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Missouri Algorithm Objectives, Set 2

• Deal with spatial variability in N need
• Support producer, retailers, consultants in
  planned sidedress operations from V6 to V16
• Support producer, retailers, consultants in
  rescue N applications when previously applied N
  has been lost

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Supporting producers in planned sidedress
operations using sensors

• 26 demo fields in 2007 ( )
• 61 demo fields 2004-2007

Nearly 30 demo fields 2008, including first
cotton field
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Color sensors can be used for sidedressing
anhydrous
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or sidedressing solution
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or with a high-clearance spinner
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with a big sprayer
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or a big injector
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On-farm sensor demos 2004-2007
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On-farm sensor demos 2004-2007
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On-farm sensor demos 2004-2007
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On-farm sensor demos 2004-2007
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On-farm sensor demos 2004-2007
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On-farm sensor demos 2004-2007
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Sensor Benefits

• Make sure enough N is applied
• Avoid unneeded N application

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N application to head-high corn N rate map June
20, 2007
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Sensor Benefits

• Make sure enough N is applied
• Avoid unneeded N application

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August 1 Aerial Photo after the June 13 UAN
Application
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2008 Our first cotton demo
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Questions?