Great Plains YP2425A Material Rate - Manual (Page 32)

30 YP2425A Table of Contents Metric Charts Great Plains Manufacturing, Inc.
401-626B Table of Contents Metric Charts 2012-02-29
Take Note of Meter Pressure
Due to delivery of multiple seeds per disc cell, a
volumetric crop requires a specific value of disc
pressurization.
Initial Meter Pressurization: Wheat
2.0 inches of water Hard Red Winter (HRW)
2.5 inches of water Soft Red Winter (SRW)
Note: Do not operate below 2.0 inches of water
10. Note the suggested initial meter pressure. Have this
value at hand in the tractor cab.
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.
11. 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 “seeds per row foot” furrow check, the next topic.
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.