GREAT PLAINS YP1225A, Manual

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YP1225A and YP1625A Table of Contents Index Volumetric Seeding
Great Plains | 401-625B | 6/19/19 91
 Calibrate
Calibration is essential for accurate populations:
Seed monitors cannot accurately count individual seeds
in volumetric planting, both due to the small seed size,
and due to multiple seeds per cell being often detected
as one seed.
Ground drive charts are only approximate, and only for
the seed variety and conditions used to develop the
chart.
Your own rate records may also be approximate. The
same seed variety planted at a different date can require
a rate adjustment due to different seed density, different
weather, different field speed, etc.
Population Risk:
Volumetric planting based strictly on ground drive charts is
likely to be inaccurate. Volumetric planting based on seed
monitor seed counts is certain to be inaccurate.
Calibrate . Check your actual rate by weight or by furrow
count. Check your seed consumption when refilling.
Calibrate your seed rate.
•
For hydraulic drive planters, use the Spreader
Calibration feature of the seed monitor.
• For ground drive or hydraulic drive planters, rely on a
furrow check.
 Furrow Checking Rate
1. Configure the planter for the approximate rate,
based on the seed rate charts.
2. Set the meter pressure to the chart value.
3. Prime the meters. See your planter Operator’s
Manual for information.
4. Plant for a short distance, just until the air delivery
system is stabilized, and the meters are all delivering
seed.
5. Select one or more rows to sample.
6. Set the planting depth to shallow for the sample
row(s). Set the press wheels to minimum force. Use
a wire to tie up the press wheel assembly.
7. Resume planting for a short distance.
8. Use a sampled row length of one foot (one meter).
Count the seeds.
 NOTE:
Interpolate rows for more precise rate results. Double or
triple the sample length to improve accuracy.
9. On the tables on the next page, find the nearest
Seeds per row ft (Seeds per row meter) in the table
for your row spacing.
10. Look up the population, or pounds per acre
(kilograms per hectare).