The following kernel loss chart shows the number of kernels that must be lost per square foot before a total of one bushel per acre is lost. It also points out that a few kernels lost behind the combine does not call for numerous adjustments on the combine.
Corn Head Number
Row Spacing (Inches)
Number of Rows
9450 and 9550
9650
Kernels Per Sq. Ft. for One Bu. Loss Per Acre
443
711 mm (28)
4
4
-
762 mm (30)
4
4
-
493
762 mm (30)
4
4
-
444
914 mm (36)
4
5
-
965 mm (38)
4
5
-
1016 mm (40)
4
5
-
494
914 mm (36)
4
5
-
965 mm (38)
4
5
-
546
914 mm (36)
5
6
5
594
914 mm (36)
5
6
5
965 mm (38)
5
6
5
643
711 mm (28)
6
6
4
762 mm (30)
6
6
5
693
762 mm (30)
6
6
5
644 and 694
914 mm (36)
6
7
7
965 mm (38)
6
8
7
645
1016 mm (40)
6
8
7
843
711 mm (28)
8
8
6
762 mm (30)
8
8
7
893
762 mm (30)
8
8
7
844 and 894
914 mm (36)
8
-
8
965 mm (38)
8
-
9
1243 and 1293
762 mm (30)
12
-
10
These figures are approximate and vary with seed size and variety.
Seeds are gathered directly behind the separator without a straw spreader or straw chopper.