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Reducing Harvest Losses Combine Calibration. John Nowatzki Extension Ag Machine Systems Specialist North Dakota State University. Keeping Harvest Losses Low. Where Losses Occur How to Measure Losses Yield Monitor Calibration Machine Adjustments (Dealers). Where Do Losses Occur?.

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reducing harvest losses combine calibration

Reducing Harvest LossesCombine Calibration

John Nowatzki

Extension Ag Machine Systems Specialist

North Dakota State University

keeping harvest losses low
Keeping Harvest Losses Low
  • Where Losses Occur
  • How to Measure Losses
  • Yield Monitor Calibration
  • Machine Adjustments (Dealers)
where do losses occur
Where Do Losses Occur?
  • Pre-harvest loss
    • Uncontrollable by Operator
  • Header loss
  • Combine cylinder loss
  • Combine separation loss
how are losses measured
How Are Losses Measured?
  • Pre-harvest Loss
  • Header Loss
  • Threshing and Separation Loss
  • Total Loss
seeds per sq ft loss per acres
Seeds per Sq. Ft. = Loss per Acres

Canola: 4 seeds = 1 pound per acre

Wheat: 16 seeds = 1 bushel

Barley: 15 seeds = 1 bushel

Soybeans: 4 seeds = 1 bushel

Corn: 2 seeds = 1 bushel

Oats: 9 seeds = 1 bushel

Wheat 700,000

Barley 650,000

Oats 400,000

Soybeans 150,000

Corn 80,000

150,000 seeds per lb.

150,000/43,560 = 3.5/sq. ft. for 1 lb.

pre harvest loss
Pre-harvest Loss

Pre-harvest Loss – Count Seeds before Combining

60 seeds per sq. ft.

60/4 = 15 lbs. loss

header losses
Header Losses

Swather – 30’

Swath – 6’

30’ / 6’ = 5

  • Back up Combine Several Feet
    • Count Seeds on Ground (200 per sq. ft.)
    • Subtract Pre-harvest (60 seeds) 200 – 60 = 140)
    • Account for Swather Width (140 / 5 = 28 per sq. ft.) (28 seeds / 4 = 7 lbs. per acre)
threshing and separation losses
Threshing and Separation Losses
  • Seeds behind Combine (400 per sq. ft.)
    • Subtract Pre-harvest (60 seeds) 400 – 60 = 340)
    • Account for Swather Width (340 / 5 = 68 per sq. ft.) (68 seeds / 4 = 17 lbs. per acre) (30’ swather)

Pre-harvest 15 lbs.

Header 7 lbs.

Threshing 17 lbs.

Total 39 lbs.

yield monitoring field crops
Yield Monitoring – Field Crops
  • Quantity
    • Volumetric – Grain Pile Measured with a Light Beam
    • Impact-plate – Grain Impact Electronically Sensed
  • Moisture - Measures Electrical Capacitance
  • GPS - Records to Locations on Field Map
yield monitor calibration
Yield Monitor Calibration
  • Harvest “Loads” from a Range of Yields
    • 50 – 100 bushels
  • Weigh Loads Separately
  • Enter Actual Weight into Yield Monitor
more information
More Information
  • John Nowatzki
  • Extension Ag Machine Systems Specialist
  • North Dakota State University
      • Telephone: 701-231-8213
      • Email: John.Nowatzki@ndsu.edu
      • http://www.ag.ndsu.edu/agmachinery