Great Plains YP1630F-1670 Material Rate - Manual (Page 9)

Great Plains Manufacturing, Inc. Contents Appendix Seed Rate 7
2012-12-04 Contents Appendix 401-832B
Checking Singulated Rates
1. Determine the sample distance to check. Find your
row spacing in the table at right.
2. Note the number of rows to sample. Adjust the
planting depth to a shallow setting on one or two
outside rows (per table). Tie up the press wheel
arms with wire or bungee to prevent furrow closure.
3. Decide whether to use 1/1000th or 1/200th of a
hectare or acre as the sample size. 1/200th provides
a more accurate sample.
4. Configure the planter for the chart rate, either using
the chart settings for sprockets, or, with hydraulic
drive, selecting the rate on the seed monitor.
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
wheel or finger count, air system, tire size, tire
pressures, sprocket or 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.
Rows to Sample Length of Sample Run
Row
Spacing
Rows
to Count
1/1000th 1/200th
70 cm 1 ha: 14.29 m 71.45 m
30 inches 1 ac: 17 ft. 5 in. 87 ft. 1 in.
Metric Example:
Sample size:
1/1000th ha
Plant for approximately:
20 meters
Measure the central:
14.29 meters (1429 cm)
USc Example:
Sample size:
1/1000th ac
Plant for approximately:
25 feet
Measure the central:
17 feet 5 inches
Metric Example:
Seeds counted:
82
Computed for full hectare:
82 x 1000 = 82 000
This differs from chart by
less than 1%
USc Example:
Seeds counted:
31
Computed for full acre:
31 x 1000 = 31,000
This differs from chart by
less than 1%