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I NITIATION OF Y IELD P OTENTIAL T RIALS & D EVELOPMENT OF Z IMBABWEAN A LGORITHMS

I NITIATION OF Y IELD P OTENTIAL T RIALS & D EVELOPMENT OF Z IMBABWEAN A LGORITHMS. Precision Sensing Extension Workshop January 8, 2008 Harare, Zimbabwe, Africa. M. Cody Daft and Daniel E. Edmonds Graduate Research Assistants Plant & Soil Sciences. I NTRODUCTION.

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I NITIATION OF Y IELD P OTENTIAL T RIALS & D EVELOPMENT OF Z IMBABWEAN A LGORITHMS

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  1. INITIATION OF YIELD POTENTIAL TRIALS & DEVELOPMENT OF ZIMBABWEAN ALGORITHMS Precision Sensing Extension Workshop January 8, 2008 Harare, Zimbabwe, Africa M. Cody Daft and Daniel E. Edmonds Graduate Research Assistants Plant & Soil Sciences

  2. INTRODUCTION Yield Potential trials necessary for the development of algorithms specific for Zimbabwe Crop Specific Implement trials All N applied preplant No mid-season N application Collect sensor NDVI readings Correlate Yield with Sensor readings

  3. Sorghum Wheat Corn Rep 3 Rep 2 Rep 1 Plot Size: 10’ x 20’ Alley size: 5’ Total Area: 70’ x 60’

  4. YP0 YPN YPN YPMAX RI=1.5 RI=2.0 A Grain yield INSEY (NDVI/days from planting to sensing) RI-NFOAYPN=YP0 * RI YP0 = (NDVI / Days, GDD>0)YP0 = INSEYYPN = (YP0*RI) Nf = (YP0*RI) – YP0))/Ef

  5. YP0 YPMAX B Grain yield INSEY (NDVI/days from planting to sensing) Max Yield-NFOA Nf = (YPMAX-YP0)/Ef

  6. RI=2.0 YP0 YPN YPMAX CV C Grain yield CV INSEY (NDVI/days from planting to sensing) RICV-NFOA Nf = ((YP0*RI)*(65-CV/65-CrCV)) – YP0/Ef 65? Limit of CV data Critical CV or CrCV, changes for different crops Corn Wheat

  7. RI=2.0 YP0 YPN YPMAX Ht Ht Grain yield INSEY (NDVI/days from planting to sensing) RI-Height-NFOA Nf = ((YP0*RI)*(Hmax/days from planting)) – YP0/Ef Hobs/days from planting

  8. CONCLUSIONS Conduct YP trials to develop YP algorithms for crops in Zimbabwe Implement trials in such a manner that yields can be correlated with sensor NDVI readings. IN a NUT SHELL….. Collect NDVI readings from plots (on-farm, etc.) Different planting dates, different sensing dates BUT….. Make sure they don’t receive any added N LAST…. Collect yield data and then correlate INSEY with measured YIELD

  9. INITIATION OF YIELD POTENTIAL TRIALS & DEVELOPMENT OF ZIMBABWEAN ALGORITHMS QUESTIONS or COMMENTS www.nue.okstate.edu/ Precision Sensing Extension Workshop Zimbabwe, Africa

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