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

2. Regional Corn Trials 2005 Treatment Pre-plant N Top-dress
Method of Application
lb/ac 1
Check 2
N Rich Strip
N Rich Strip (160 to 200 depending on preplant soil test) 3 40 4 80 5
120 6
160 7
Nitrogen Sufficiency (30lbs applied when SI<95%) 8 9
NFOA- OSU 10 11
Missouri / Minnesota 12 13
Virginia  spreadsheet 14

3. 2005: Nebraska, Oklahoma, Missouri, Virginia, Minnesota
Issues for ALL TRIALS Replications: 3-4 Plot size:  4 rows wide x ft long Row Spacing: As per equipment used (30" or 36")
P and K applied preplant to local sufficiency levels Nitrogen to be applied between V8 and V12 Nitrogen Sources:  1. Pre-Plant: Urea or UAN 2. Topdress: UAN Sensor/Chlorophyll Meter Readings Active Sensor readings taken weekly (RED) Chlorophyll meter readings (SPAD) taken weekly  
Pre Plant Soil Tests (0-12, and 12-24") NO3-N, and NH4-N Total N Organic C pH

4. 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

5. Regional Trial Issues Minnesota Independence of RI and YP0
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)

6. 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 ?

7. Regional Trial
Standardized protocol for collecting Data (units)