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

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.

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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

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.

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

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

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

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

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

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

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