Great Plains 1300 13-Foot Material Rate - Manual (Page 26)

24 1300 and 1300F Table of Contents Metric Charts Great Plains Manufacturing, Inc.
175-157B Table of Contents Metric Charts 2014-03-10
91. Subtract to calculate the difference between the
measured rate and the original target rate.
92. If a Density Adjustment was made (see page 20),
apply it to the variance.
93. Consult the chart for the chart rate used for your first
calibration run with this material. If the just-measured
result was low, add the [adjusted] variance to the
previously used chart rate. If the measured result
was high, subtract the [adjusted] variance from the
previous chart rate.
94. Reset the fertilizer Range and Final Drive based on
the settings at the new chart rate.
95. Re-calibrate using the sprocket settings for the
resulting new target rate.
96. You may want to repeat calibration procedure at the
new setting if your results varied greatly from the
desired field rate.
97. With calibration complete, store the calibration crank,
re-engage the lock-out hub, re-install any seed chain
removed and reconnect fertilizer hoses.
98. Check that your end-wheel tires are 7.5 x 20, 4-ply
Rib Implement and properly inflated. See “Tire
Inflation Chart” in Operator Manual.
99. When drilling, check application rate by noting acres
drilled, amount of fertilizer added to drill and fertilizer
level in drill box. If you are applying more or less than
desired, adjust rate slightly to compensate for field
conditions.
For example:
the target rate was 100 lbs/ac:
new variance=7
Variance FieldRate MeasuredRate – =
4.1 100 95.9 – =
In the example, we are using 45# material, factor 1.45.
Our density-corrected variance is:
6 lbs/ac
AdjustedVariance Variance CorrectionFactor
Ч
=
5.95 4.1 1.45 Ч =
For example:
Our measured rate was high, so we
subtract the adjusted variance (6)
from the chart rate (145)
to obtain a new chart rate (139) The closest is:
138
This corresponds to a new drive setup of:
Range: Low
Driving: 17T
Driven: 20T