Great Plains YP4425A Material Rate User Manual
Page 16
12
YP3025A, YP4025A and YP4425A
Great Plains Manufacturing, Inc.
401-627B
2014-05-13
5.
Plant at the desired planting speed for slightly more
than the computed sample run length.
6.
Measure off the sample distance, balanced in
between where seeding started and stopped.
7.
Count the number of seeds over the distance
measured. Also note the consistency of the seed
spacing.
8.
Compute the rate for a full acre or hectare.
For a 1/1000th sample, multiply the counted seeds
by 1000.
For a 1/200th sample, multiply the counted seeds by
200.
9.
If the field and chart rates vary by more than a few
percent, re-check planter setup, including meter disk
or cell count, air system, hydraulic drive setup, chain
slack, etc. If seed spacing is irregular, this suggests
a seed delivery problem, and not a rate setup
problem.
10. While planting, pay attention to the seed monitor. In
addition to confirming the single-row furrow check, it
will also provide field rate data on all the other rows,
and alert you to any irregularities or stoppages.
USc Example:
Sample size:
1/1000th ac
Plant for approximately:
25 feet
Measure 1 row of central:
17 feet 5 inches
Metric Example:
Sample size:
1/1000th ha
Plant for approximately:
20 meters
Measure 1 row of central:
14.29 meters
USc Example:
Seeds counted:
121
Computed for full acre:
121
× 1000 = 121,000
This differs from target by:
1.8%
Metric Example:
Seeds counted:
309
Computed for full hectare:
309
× 1000 = 311,000
This differs from target by:
1.3%