Calculations to measure the actual application rate:
43,560 ft2/acre x ___ B (lbs) ÷ ____ C (rev) ÷ ____D (ft) ÷ _____ E (ft) = __A (lbs/acre)
10,000 m2/ha x ___B (kg) ÷ ___C (rev) ÷ ____ D (m) ÷ _____E (m) = ______ A (kg/ha)
A = application rate (lbs/acre or kg/ha)
B = weight of fertilizer (lbs or kg) collected from applicator(s) one row during (C) revolutions
C = number of revolutions of the drive wheel
D = “actual” drive wheel circumference (ft or m)
E = row spacing (ft or m).
Next: Worksheet 2: Drill Spreader Calibration Calculation
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