By-Plant Prediction of Corn By-Plant Prediction of Corn Forage Biomass and Grain Forage Biomass and Grain Yield at Various Growth Yield at Various Growth Stages using NDVI and Plant Stages using NDVI and Plant Height Height K. Freeman, B. Raun, K. K. Freeman, B. Raun, K. Martin, R.Teal, D. Arnall, Martin, R.Teal, D. Arnall, M. Stone, J. Solie M. Stone, J. Solie
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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. - PowerPoint PPT Presentation
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By-Plant Prediction of Corn Forage By-Plant Prediction of Corn Forage Biomass and Grain Yield at Various Biomass and Grain Yield at Various
Growth Stages using NDVI and Growth Stages using NDVI and Plant HeightPlant Height
K. Freeman, B. Raun, K. Martin, K. Freeman, B. Raun, K. Martin, R.Teal, D. Arnall, M. Stone, J. R.Teal, D. Arnall, M. Stone, J.
Solie Solie
IntroductionIntroduction
Stone el al., 1996 found that N uptake could Stone el al., 1996 found that N uptake could be predicted in winter wheat using NDVI.be predicted in winter wheat using NDVI.
Varvel et al., 1997 noted that corn N status Varvel et al., 1997 noted that corn N status could be monitored using chlorophyll meters.could be monitored using chlorophyll meters.
Muchado et al., 2002 stated that in dry years, Muchado et al., 2002 stated that in dry years, plant height can explain 90% and 61% of the plant height can explain 90% and 61% of the variation of total dry and grain yield, variation of total dry and grain yield, respectively. respectively.
IntroductionIntroductiony = 151.13e3.6704x
R2 = 0.78
0
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0 0.2 0.4 0.6 0.8 1NDVI
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at F
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IntroductionIntroduction
Prediction of Corn Forage Biomass Prediction of Corn Forage Biomass Avenue for predicting final grain yieldAvenue for predicting final grain yield Estimate Corn Silage in the FieldEstimate Corn Silage in the Field
Prediction of Corn Forage N UptakePrediction of Corn Forage N Uptake Prediction of Corn Grain YieldPrediction of Corn Grain Yield
Ability to predict corn grain yield will help to Ability to predict corn grain yield will help to prescribe N rates mid-seasonprescribe N rates mid-season
These rates can be predicted on a by-plant basisThese rates can be predicted on a by-plant basis
ObjectiveObjective To determine the feasibility of by-To determine the feasibility of by-
plant sensor data collected at various plant sensor data collected at various stages of corn development for stages of corn development for predicting corn forage biomass, N predicting corn forage biomass, N uptake, and corn grain yield.uptake, and corn grain yield.
MethodsMethods
INSEY_DFP = NDVI / Days from INSEY_DFP = NDVI / Days from Planting to SensingPlanting to Sensing
INSEY_GDD = NDVI / Cumulative INSEY_GDD = NDVI / Cumulative GDD from Planting to SensingGDD from Planting to Sensing
GDD = (TempGDD = (Tempmin min + Temp+ Tempmaxmax /2) – 40 F /2) – 40 F Regression analysis performed using Regression analysis performed using
an exponential modelan exponential model
MethodsMethods
• A GreenSeeker A GreenSeeker Sensor was Sensor was mounted on a mounted on a bicyclebicycle• A shaft encoder A shaft encoder was used to assign was used to assign distance to each distance to each sensor readingsensor reading• Readings were Readings were taken once per taken once per centimetercentimeter
MethodsMethods
• Plant Height measurements were taken at each sensor reading and clipping• Heights were measured by extending the last collared leaf upright
MethodsMethods
Area Calculation for Plant 2 Area = ½(10) + ½(30)* Row Spacing
By-Plant Prediction of Corn Grain Yield with Sensor By-Plant Prediction of Corn Grain Yield with Sensor Reading taken from V8-R6 Growth Stages in 2004Reading taken from V8-R6 Growth Stages in 2004
By-Plant Prediction of Corn Forage N Uptake By-Plant Prediction of Corn Forage N Uptake at V8-V11 Growth Stage using NDVI in 2003 at V8-V11 Growth Stage using NDVI in 2003
By-Plant Prediction of Corn Forage N uptake By-Plant Prediction of Corn Forage N uptake at V8-V11 Growth Stage using Plant Height at V8-V11 Growth Stage using Plant Height
By-Plant Prediction of Corn Forage N Uptake at V8-By-Plant Prediction of Corn Forage N Uptake at V8-V11 Growth Stage using NDVI*Height in 2003 & V11 Growth Stage using NDVI*Height in 2003 &