Great Plains YP2425A Material Rate - Manual (Page 13)

Great Plains Manufacturing, Inc. Table of Contents Metric Charts Rate Setting Overview 11
2012-02-29 Table of Contents Metric Charts 401-626B
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 the central:
17 feet 5 inches
Metric Example:
Sample size:
1/200th ha
Plant for approximately:
20 meters
Measure the central:
14.29 meters
USc Example:
Seeds counted:
121
Computed for full acre:
121
× 1000 = 121,000
This differs from chart by:
1.8%
Metric Example:
Seeds counted:
300
Computed for full hectare:
300
× 1000 = 300,000
This differs from chart by:
0.6%