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# Corn Nitrogen Fertilization Algorithm - PowerPoint PPT Presentation

Corn Nitrogen Fertilization Algorithm. Approach. Predict “Yield Potential” Mid Season Predict “Responsiveness to Applied N” Project “N Uptake” Difference (Fertilized & Non Fertilized) Project “N Rate” Based on the Difference. Farmer Practice. N Rich Strip.

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### Corn Nitrogen Fertilization Algorithm

Predict “Yield Potential” Mid SeasonPredict “Responsiveness to Applied N” Project “N Uptake” Difference (Fertilized & Non Fertilized)Project “N Rate” Based on the Difference

N Rich Strip

• Yield Prediction, or YP0 (Farmer Practice)

• Predict Response Index or RI (NDVI N Rich/NDVI Farmer Practice)

• Measure CV in Farmer Practice

• Estimate of Plant Population

• Yield Achievable with N (YP0*RI)

• Yield Achievable Adjusted based on CV and Population

• N uptake Difference using a fixed %N (6 – 1)

• N rate Determined by Dividing N uptake Difference/ Efficiency Factor

=

INSEY

Days from planting to sensing, GDD>0

Winter Wheat

Units:

biomass, kg/ha/day where GDD>0

=

INSEY

Days from planting to sensing

Corn

Units: biomass, kg/ha/day

8.9 1969-1983

= 6.3 Mg

= 80.0 kg N

1975 2.5

1978 7.4

11.3

= 3.8 Mg

= 48.6 kg N

Difference in Grain N Uptake of 31.4 kg NAt an application efficiency of 50%, 1.25% Grain NN Fertilizer Requirement Differed by 62.8 kg N

RI-NFOA 1969-1983YPN=YP0 * RI

YP0

YPN

YPN

YPMAX

RI=1.5

RI=2.0

Grain yield

INSEY (NDVI/days from planting to sensing)

Nf = (YP0*RI) – YP0))/Ef

Aug 16, 2002 1969-1983

Aug 28, 2002

Nov 7, 2002

Previous Nitrogen Fertilizer Optimization Algorithm

1. Establish preplant N Rich Strip(NRS) 4. Determine Response Index (RI)2. NDVI (biomass) =NDVINRS/NDVIFarmer3. Predict potential yield 5. Predict potential grain yield need # of days from planting to (YP0) with added N, YPN =(YP0*RI) sensing (INSEY = biomass prod./day) 6. Fertilizer Rec = (grain N uptake INSEY vs. Yld eqn. YPN – grain N uptake YP0/0.6)

CORN

YPN

May

June

August

RI

NDVI (sensing date)

YP0

Planting date

days from planting to sensing

RICV-NFOA 1969-1983

RI=2.0

YP0

YPN

YPMAX

CVlim = 65 (corn)CVlim = 40 (wheat)

CV

Grain yield

CV

INSEY (NDVI/days from planting to sensing)

YPN =YP0*RI

CrCV = (((-0.0003)*POP)+36.315)

YPCV = YPN*((65-CV)/(65-CrCV))

NRate = ((YPCV-YP0)*0.0125/0.6)

Use of Population and CV 1969-1983

RI = NRichStrip/FarmerPractice

YP0 =((1565*EXP((FarmerPractice/Days)*154.7)))

RI = (NRichStrip/FarmerPractice)*1.64 - 0.5287

YPN =YP0*RI

CrCV = (((-0.0003)*POP)+36.315)

YPCV = YPN*((65-CV)/(65-CrCV))

NRate = ((YPCV-YP0)*0.0125/0.6)