Both bulk and singulating row crop planters can be calibrated stationary by following the procedure used for stationary calibration of fertilizer applicators and grain drills. When the stationary method is used, the seeding rate is calculated by dividing the seeds planted per revolution of the drive wheel by the simulated acres covered per revolution of the drive wheel, when the stationary method is used or:
This equation can also be written as:
where R = seeding rate (seeds/ac); sd = number of seeds; nr = number of revolutions of drive wheel; A = area.
Problem: What is the planting rate for corn when 0.22 lb of seeds were weighted after the 18.0 inch drive wheel was turned 25 revolutions? The planter is set for 36 inch rows and the seed size is 1,500 seeds per pound.
Solution: When calibrating row crop planters the area used is determined by the row spacing and the distance traveled during the calibration, or the simulated distance traveled.
A = w x d where A = area (ft2); w = row spacing (ft); d = distance (ft). R . lb \ = W (lb) „ nr (rev)
25 rev 1on. 1ft 1 ac 1ft 18.0 in x -x n x -t x 36 in x
12 in 43560 ft2 12 in
The planting rate in seeds per acre is:
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