Great Plains 1007NT Material Rate - Manual (Page 28)

Great Plains Mfg., Inc.
26
150-290B 07/08/2009
If this figure is different than desired, change your
sprockets and drive type accordingly.
14. Divide the desired field rate by the measured rate to
obtain a correction factor.
15. Multiply the desired field rate by the correction factor
to obtain an adjusted rate setting to use.
16. Use the adjusted rate to find a new drive configura-
tion.
17. When drilling, check the amount of seed you are
using by noting the acres drilled, amount of seed
added to drill, and the level of seed in the box. If you
suspect you are drilling more or less seed than
desired, and you have accurately calibrated the drill
to your seed, you may need to change your sprocket
arrangement to compensate for your field conditions.
Factors which will affect seeding rates are: weight of
seed, size of seed, relative humidity and moisture con-
tent of seed, ratio of inert material to seed, different pro-
portions of seed types affecting density and ground
wheel slippage.
All seed mixes will vary.
Brome Grass Native Grass Rates
U.S. Customary units. Metric chart is on page 50.
Example: The calibration result was high.
CorrectionFactor:
0.66 = 13.2
÷ 20
CorrectionFactor
FieldRate
SampleRate
----------------------------
=
Example:
AdjustedRate:
8.7 = 13.2 x 0.66
AdjustedRate FieldRate CorrectionFactor × =
IMPORTANT !
The chart is to be used as a reference to your own
brome grass mix. All brome grass mixes vary so
this is why you must calibrate each mix using the
chart only as a starting point.
Note: You may want to repeat the calibration procedure if
your results vary greatly from the seed rate chart.
The nearest setting to this is 8.6, which is a change to
Drive Type: 1
and a final Driven sprocket of:
15T
Alternatively, use Rate Reduction and
Drive Type: 2
Final Sprocket: 18T