1. K. Freeman, B. Raun, K. Martin, R.Teal, D. Arnall, M. Stone, J. Solie
By-Plant Prediction of Corn Forage Biomass and Grain Yield at Various Growth Stages using NDVI and Plant Height
K. Freeman, B. Raun, K. Martin, R.Teal, D. Arnall, M. Stone, J. Solie

2. Introduction
Stone el al., 1996 found that N uptake could be predicted in winter wheat using NDVI.
Varvel et al., 1997 noted that corn N status could be monitored using chlorophyll meters.
Muchado et al., 2002 stated that in dry years, plant height can explain 90% and 61% of the variation of total dry and grain yield, respectively.

3. Introduction

4. Introduction Prediction of Corn Forage Biomass
Avenue for predicting final grain yield
Estimate Corn Silage in the Field
Prediction of Corn Forage N Uptake
Prediction of Corn Grain Yield
Ability to predict corn grain yield will help to prescribe N rates mid-season
These rates can be predicted on a by-plant basis

5. Objective
To determine the feasibility of by-plant sensor data collected at various stages of corn development for predicting corn forage biomass, N uptake, and corn grain yield.

6. Methods INSEY_DFP = NDVI / Days from Planting to Sensing
INSEY_GDD = NDVI / Cumulative GDD from Planting to Sensing
GDD = (Tempmin + Tempmax /2) – 40
Regression analysis performed using an exponential model

7. Methods A GreenSeeker Sensor was mounted on a bicycle
A shaft encoder was used to assign distance to each sensor reading
Readings were taken once per centimeter

8. Methods
Plant Height measurements were taken at each sensor reading and clipping
Heights were measured by extending the last collared leaf upright

9. Methods 1 2 3
10cm
30cm
Area Calculation for Plant 2  Area = ½(10) + ½(30)* Row Spacing
Then, Area = (15 cm + 5cm)* 76cm= 1520 cm2

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24. Conclusions
Blah blah blah

25. By-Plant Prediction of Corn Grain Yield with Sensor Reading taken from V8-R6 Growth Stages in 2004

27. By-Plant Prediction of Corn Forage N Uptake at V8-V11 Growth Stage using NDVI in 2003 & 2004

28. By-Plant Prediction of Corn Forage N uptake at V8-V11 Growth Stage using Plant Height in 2003 & 2004

29. By-Plant Prediction of Corn Forage N Uptake at V8-V11 Growth Stage using NDVI*Height in 2003 & 2004