Great-plains YP2425A Material Rate User Manual download pdf (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.

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Great-plains YP2425A Material Rate User Manual Page 32