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Corn Nitrogen Fertilization Algorithm

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

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  1. Corn Nitrogen Fertilization Algorithm

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

  3. Farmer Practice 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

  4. NDVI at F5 = INSEY Days from planting to sensing, GDD>0 Winter Wheat Units: biomass, kg/ha/day where GDD>0

  5. NDVI, V8 to V10 = INSEY Days from planting to sensing Corn Units: biomass, kg/ha/day

  6. Long-Term N Fertilization Experiment in Corn, Mead, NE 1969-1983

  7. Yield Prediction Equations

  8. 8.9 = 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

  9. Predicting RI in Corn

  10. RI-NFOAYPN=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

  11. Aug 16, 2002 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

  12. RICV-NFOA 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)

  13. Use of Population and CV 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)

  14. Rainfed and Irrigated Corn

  15. Yield Prediction Equations

  16. Response Index vs. Sufficiency

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