Great Plains YP2425F-2470 Material Rate User Manual
Page 7
Great Plains Manufacturing, Inc.
Singulated Planting Overview
5
2013-09-23
401-406B
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
⁄
1000
th
sample, multiply the counted seeds by
1000.
For a
1
⁄
200
th
sample, multiply the counted seeds by
200.
9.
If the sample size is near 100 seeds it is likely that at
least 1% of any error is due to the small sample. A
higher seed count provides higher confidence. Even
errors up to 3% or more may require no action, as
the speed change for a single sprocket re-pairing
can be that much.
10. 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.
11. If the planter is correctly set up, you may want to
adjust the setup slightly to achieve the desired field
rate. If any adjustments are made, be sure to
perform another furrow check on the new setup.
12. 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.
Note: For most consistent results, and least wear on the
meters, check the seed rate chart for the crop or
meter type/wheel, and do not exceed the
recommended ground speed.
USc Example:
Sample size:
1
⁄
1000
th
ac
Plant for approximately:
25 feet
Measure the central:
17 feet 5 inches
Metric Example:
Sample size:
1
⁄
1000
th
ha
Plant for approximately:
20 meters
Measure the central:
14.29 meters
USc Example:
Seeds counted:
121
Computed for full acre:
121 x 1000 = 121,000
This differs from chart by:
1.8%
Metric Example:
Seeds counted:
300
Computed for full hectare:
300 x 1000 = 300,000
This differs from chart by:
0.6%