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Combine Yield Monitors. Impulse Yield Sensors John Deere Case Ag Leader Micro Trak.

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Presentation on theme: "Combine Yield Monitors. Impulse Yield Sensors John Deere Case Ag Leader Micro Trak."— Presentation transcript:

1 Combine Yield Monitors

2 Impulse Yield Sensors John Deere Case Ag Leader Micro Trak

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 John Deere Micro Track Ag Leader Case

7 Capacitance Moisture Sensors

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

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

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12 Effect of Lag Time on Combine Yield Measurements P P t t t0t0 Crop Yield Along Swath Actual Grain Yield Yield Monitor Measured Grain Yield Yield

13 Grain Flow Rate

14 Comparison on Raw and Filtered Combine Flowrate Data

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16 Smoothing Effect of the Straw Walkers

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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

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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 YieldMoisture

37 Manning Iowa Corn Field 2 Fields Merged Northwest Corner

38 Soybean Yield and pH Maps

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

40 Basics of Yield Monitoring n 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 n Measures change in weight in the trailer while allowing for comparison at different times. n Can be used for any crop that is loaded into a trailer continuously while harvested.

43 Conveyor Yield Monitor

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


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