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Combine Yield Monitors. Impulse Yield Sensors. Micro Trak. John Deere Case Ag Leader. Impulse Flow Meter Force Vectors. Dynamincs of an Impulse Flow Meter. Non-Impulse Yield Sensors. Nuclear - Massey Ferguson - Europe High Frequency Radio Waves New Holland - Not marketed.
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Impulse Yield Sensors Micro Trak John Deere Case Ag Leader
Non-Impulse Yield Sensors Nuclear - Massey Ferguson - Europe High Frequency Radio Waves New Holland - Not marketed
Capacitance Moisture Sensors Micro Track John Deere Ag Leader Case
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
Sources of Impulse Yield Sensor Error • Grain Moisture • Grain Test Weight • Grain Temperature • Grain Cultivar • Grain Species • Contamination • Dirt • Plant oils, sap, etc.
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
Yield Monitor 26.4 bu/ac Satellite Estimate 28.7 bu/ac Combine Yield Monitor and Satellite Estimated Wheat Yield Maps
GPS Error in Corn – Loss of Differential Correction Signal Oklahoma Panhandle, 1998
Two Combines in the Field with only One Equipped with GPS Oklahoma Panhandle, 1997
Corn Yield Surface with Krieging Oklahoma Panhandle, 1997
Corn Yield Surface with Krieging Oklahoma Panhandle, 1998
Wheat Yield Under a Center Pivot Irrigation System Oklahoma Panhandle, 1998
Wheat Yield Under a Center Pivot Irrigation System Oklahoma Panhandle, 1997
Wheat Yield Under a Center Pivot Irrigation System Oklahoma Panhandle, 1997
Wheat Yield Under a Center Pivot Irrigation System Oklahoma Panhandle, 1998
Southwest Iowa Corn Field Yield Moisture
Manning Iowa Corn Field Northwest Corner 2 Fields Merged
Current Yield Monitors • Mass-flow sensor • Volumetric-flow sensor • Conveyor belt load sensor • Trailer load sensor • Torque transducer
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.
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.
Corn Silage • 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