Objective: To discuss the current regional project and identify improvements needed for conducting future collaborative sensor-based research

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Objective To discuss the current regional
project and identify improvements needed for
conducting future collaborative sensor-based
research
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Regional Corn Trials 2005
Treatment Pre-plant N Top-dress Method of Application
  lb/ac lb/ac  
1 0 0 Check
2 N Rich Strip 0 N Rich Strip (160 to 200 depending on preplant soil test)
3 40 40  
4 40 80  
5 40 120  
6 40 160  
7 0   Nitrogen Sufficiency (30lbs applied when SIlt95)
8 40   Nitrogen Sufficiency (30lbs applied when SIlt95)
9 0   NFOA- OSU
10 40   NFOA- OSU
11 0   Missouri / Minnesota
12 40   Missouri / Minnesota
13 0   Virginia  spreadsheet
14 40   Virginia  spreadsheet
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2005 Nebraska, Oklahoma, Missouri, Virginia,
Minnesota

• Issues for ALL TRIALSReplications 3-4Plot
  size  4 rows wide x 20 - 30 ft longRow Spacing
  As per equipment used (30" or 36")
• P and K applied preplant to local sufficiency
  levels Nitrogen to be applied between V8 and
  V12Nitrogen Sources 1. Pre-Plant Urea or
  UAN2. Topdress UANSensor/Chlorophyll Meter
  ReadingsActive Sensor readings taken weekly
  (RED)Chlorophyll meter readings (SPAD) taken
  weekly 
• Pre Plant Soil Tests (0-12, and 12-24")NO3-N,
  and NH4-NTotal NOrganic CpH

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Regional Trial 2006 ?

• Components evaluated separately
• Elimination of specific components
• Can Yield Potential Be Predicted
• Can RI Be Predicted
• Is Sufficiency Sensitive to Yield Level
• Entire Algorithm Approach
• Complete Packages By Region
• Joint Workshop Algorithm

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Regional Trial Issues

• Minnesota
• Reference strip SPAD, V10
• N Credits using SPAD
• Independence of RI and YP0
• Dualex (France)
• Incorporation of SOIL color and EC
• Optimum N Rate not Related to Yield Level
• Total N Uptake at V8 highly correlated with final
  grain yield (Minnesota)

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Regional Trial Issues cont.

• INSEY, Minnesota, poor correlation at V8
• INSEY used to combine sites (only one site)
• Forage N uptake at V8-V12 highly correlated with
  final grain yield
• Must consider soil color, soil organic matter,
  other production variables for the regional
  approach (Gyles)
• Economic N Rate changes within a Field (MO)
• Can Yield Potential Be Predicted in All
  Environments ?

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Regional Trial

• Standardized protocol for collecting Data (units)