Great Plains YP4425A Material Rate - Manual (Page 42)

38 YP3025A, YP4025A and YP4425A Table of Contents Great Plains Manufacturing, Inc.
401-627B Table of Contents 2014-05-13
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.