OPERATOR’S MANUAL
PM100/PM100E Planter Monitor
11001-1426-200612
SEEDING RATE FORMULAS 13
SEEDING RATE FORMULAS
Use the following formulas to determine the threshold in seeds per second.
IF POPULATION IN SEEDS PER ACRE IS KNOWN
Seeds per second = P x R x V / 360000
P = Population in seeds per acre
R = Row width in inches
V = Tractor speed in miles per hour
EXAMPLE: Population is 30000, Row width is 30 inches, Tractor
speed is 6 miles per hour
Seeds per second = P X R X V / 360000
Seeds per second = 30000 x 30 x 6 / 360000
Seeds per second = 15
2/3 of 15 = 10
Set the threshold on the monitor to 2/3 of the nominal seeds per second or
round down to the next setting.
IF SEED SPACING IS KNOWN
Seeds per second = 17.6 x V / S
V = Tractor speed in miles per hour
S = Seed spacing in inches
EXAMPLE: Tractor speed is 6 miles per hour, seed spacing is 7 inches
between seeds
Seeds per second = 17.6 x V / S
Seeds per second = 17.6 x 6 / 7
Seeds per second = 15
2/3 of 15 = 10
Set the threshold on the monitor to 2/3 of the nominal seeds per second or
round down to the next setting.
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