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

Capacitance Moisture Sensors Micro Track John Deere Ag Leader Case

Capacitance Moisture Sensors

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

Grain Flow Rate

Comparison on Raw and Filtered Combine Flowrate Data

Smoothing Effect of the Straw Walkers

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

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

Data Misaligned Because of the Lag in the Combine

Error Caused by the Lag in the Combine

Missing Data

English Wheat Field - Single Soil Type

Southwest Iowa Corn Field Yield Moisture

Manning Iowa Corn Field Northwest Corner 2 Fields Merged

Soybean Yield and pH Maps

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 (Sugar Beet Harvest)

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.

Conveyor Yield Monitor

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