By-Plant Prediction of Corn Forage Biomass and Grain Yield at Various Growth Stages using NDVI and P...
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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.

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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
Introduction at Various Growth Stages using NDVI and Plant Height

  • 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.


Introduction1
Introduction at Various Growth Stages using NDVI and Plant Height


Introduction2
Introduction at Various Growth Stages using NDVI and Plant Height

  • 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
Objective at Various Growth Stages using NDVI and Plant Height

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
Methods at Various Growth Stages using NDVI and Plant Height

  • INSEY_DFP = NDVI / Days from Planting to Sensing

  • INSEY_GDD = NDVI / Cumulative GDD from Planting to Sensing

  • GDD = (Tempmin + Tempmax /2) – 40 F

  • Regression analysis performed using an exponential model


Methods1
Methods at Various Growth Stages using NDVI and Plant Height

  • 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


Methods2
Methods at Various Growth Stages using NDVI and Plant Height

  • Plant Height measurements were taken at each sensor reading and clipping

  • Heights were measured by extending the last collared leaf upright


Methods3
Methods at Various Growth Stages using NDVI and Plant Height

1

2

3

10cm

30cm

Area Calculation for Plant 2  Area = ½(10) + ½(30)* Row Spacing

Then, Area = (5 cm + 15cm)* 76cm= 1520 cm2


Results
Results at Various Growth Stages using NDVI and Plant Height


Results1
Results at Various Growth Stages using NDVI and Plant Height


Results2
Results at Various Growth Stages using NDVI and Plant Height


Results3
Results at Various Growth Stages using NDVI and Plant Height


Results4
Results at Various Growth Stages using NDVI and Plant Height


Results5
Results at Various Growth Stages using NDVI and Plant Height


Results6
Results at Various Growth Stages using NDVI and Plant Height


Results7
Results at Various Growth Stages using NDVI and Plant Height


Results8
Results at Various Growth Stages using NDVI and Plant Height


Results9
Results at Various Growth Stages using NDVI and Plant Height


Results10
Results at Various Growth Stages using NDVI and Plant Height


Results11
Results at Various Growth Stages using NDVI and Plant Height


Conclusions
Conclusions at Various Growth Stages using NDVI and Plant Height

  • NDVI was a better predictor of forage yield at early growth stages

  • N uptake was correlated with NDVI at early and later growth stages

  • The product of NDVI and Plant Height improved the ability to predict forage and N uptake


Conclusions1
Conclusions at Various Growth Stages using NDVI and Plant Height

  • Final grain yield was accurately predicted at the V10 and V8 growth stages.

  • INSEY was slightly better than NDVI alone for predicting final grain yield.

  • There was no difference between INSEY_DFP and INSEY_GDD.


K freeman b raun k martin r teal d arnall m stone j solie

http://www.soiltesting.okstate.edu/SBNRC/SBNRC.php at Various Growth Stages using NDVI and Plant Height

http://www.nue.okstate.edu


By plant prediction of corn grain yield with sensor reading taken from v8 r6 growth stages in 2004
By-Plant Prediction of Corn Grain Yield with Sensor Reading taken from V8-R6 Growth Stages in 2004



Results12
Results Stage using NDVI in 2003 & 2004


Results13
Results 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 Plant Height in 2003 & 2004


By plant prediction of corn forage n uptake at v8 v11 growth stage using ndvi height in 2003 2004
By-Plant Prediction of Corn Forage N Uptake at V8-V11 Growth Stage using NDVI*Height in 2003 & 2004