1. Combine Yield Monitors

2. Impulse Yield Sensors
Micro Trak
John Deere
Case
Ag Leader

3. Impulse Flow Meter Force Vectors

4. Dynamincs of an Impulse Flow Meter

5. Non-Impulse Yield Sensors
Nuclear -
Massey Ferguson - Europe
High Frequency Radio Waves
New Holland - Not marketed

6. Capacitance Moisture Sensors
Micro Track
John Deere
Ag Leader
Case

7. Capacitance Moisture Sensors

9. Sources of Yield Map Error
Unknown swath width
Time lag of grain through combine
GPS error
Multiple paths through combine
Surging of grain through combine
Grain losses
Sensor Calibration

10. Sources of Impulse Yield Sensor Error
Grain Moisture
Grain Test Weight
Grain Temperature
Grain Cultivar
Grain Species
Contamination
Dirt
Plant oils, sap, etc.

12. Effect of Lag Time on Combine Yield Measurements
Crop Yield Along Swath
Actual Grain Yield
Yield t P t0
Yield
Yield Monitor Measured Grain Yield P t

13. Grain Flow Rate

14. Comparison on Raw and Filtered Combine Flowrate Data

16. Smoothing Effect of the Straw Walkers

21. Combine Yield Monitor and Satellite Estimated Wheat Yield Maps
Yield Monitor 26.4 bu/ac
Satellite Estimate 28.7 bu/ac

22. GPS Error in Corn – Loss of Differential Correction Signal
Oklahoma Panhandle, 1998

23. Two Combines in the Field with only One Equipped with GPS
Oklahoma Panhandle, 1997

24. Corn Yield Surface with Krieging
Oklahoma Panhandle, 1997

25. Corn Yield Surface with Krieging
Oklahoma Panhandle, 1998

26. Wheat Yield Under a Center Pivot Irrigation System
Oklahoma Panhandle, 1998

27. Wheat Yield Under a Center Pivot Irrigation System
Oklahoma Panhandle, 1997

28. Wheat Yield Under a Center Pivot Irrigation System
Oklahoma Panhandle, 1997

29. Wheat Yield Under a Center Pivot Irrigation System
Oklahoma Panhandle, 1998

32. Data Misaligned Because of the Lag in the Combine

33. Error Caused by the Lag in the Combine

34. Missing Data

35. English Wheat Field - Single Soil Type

36. Southwest Iowa Corn Field
Yield
Moisture

37. Manning Iowa Corn Field
Northwest Corner
2 Fields Merged

38. Soybean Yield and pH Maps

39. Current Yield Monitors
Mass-flow sensor
Volumetric-flow sensor
Conveyor belt load sensor
Trailer load sensor
Torque transducer

40. Basics of Yield Monitoring
Possible Crops to Monitor
Wheat and other grains
Cotton
Potato and Sugar Beets
Beans
Rice
Specialty Crops
Grapes, Tomatoes, Carrots, etc.

41. Yield Mapping Trailer (Sugar Beet Harvest)

42. Yield Mapping Trailer
Measures change in weight in the trailer while allowing for comparison at different times.
Can be used for any crop that is loaded into a trailer continuously while harvested.

43. Conveyor Yield Monitor

44. Corn Silage Fr(t)=Yi(t)Sp(t)W
The drive shaft of the base unit powering the cutterhead, feedrolls, and front attachment, are instrumented with strain gauge torque transducers.
Cutting power is linearly related to material feedrate.
Material flow can be expressed as:
Fr(t)=Yi(t)Sp(t)W