Loss Calculation
“Quick check” for combine grain loss
Spreading discharge
Grain loss calculated per square foot across the entire field.
To perform a quick estimate for total grain loss from the combine, count the
number of seeds found in a square foot behind the combine. Determine the
quantity of loss in at least three places throughout the field to arrive at an
average.
• Remember to
subtract any pre-harvest loss, grain loss caused by the
header, or loss due to combine leaks in the field!
Use TABLE 1 below to determine grain loss in bushels per acre.
TABLE 1 - SEED COUNT PER SQUARE FOOT
15 ft. 20 ft. 25 ft. 30 ft. 35 ft. 40 ft.
Wheat
19 19 19 19 19 19
Corn
2 2 2 2 2 2
Soybeans
5 5 5 5 5 5
Canola
111 111 111 111 111 111
“Next step” for combine grain loss
If it is determined in the “quick check” that combine harvest loss is
unacceptable, it is critical to determine the quantity of loss due to the rotor and
the quantity due to the shoe.
Follow the steps below to estimate grain loss from the rotor and the shoe.
TABLE 2 - CALCULATED LOSS IN TOTAL GRAIN PER SWATH
15ft. 20 ft. 25ft. 30ft. 35ft. 40ft.
Wheat
285 380 475 570 665 760
Corn
30 40 50 60 70 80
Soybeans
75 100 125 150 175 200
Canola
†
1665 2230 2775 3330 3885 4440
Canola
by
Weight
(g)
7.8
18
10.4
24
13.0
30
15.6
36
18.2
42
20.8
48
Canola
by
Volume
(mL)
† Canola shown in weight and volume due to the large quantity of seeds
required to equal 1 bushel of loss.
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