Great Plains YP825AR Material Rate User Manual
Page 57
Great Plains Manufacturing, Inc.
Dry Fertilizer Rate
53
2013-11-11
401-923B
5.
Lower the planter in field conditions, pull forward until
material is flowing into the sample containers. Stop.
6.
Empty the sample containers back into the hopper.
7.
Line up at the start of the measured distance. Lower
the planter. Accelerate to intended application
speed. Stop of lift at the end of the measured
distance.
8.
Add up the weights of the sampling containers
(GrossWeight). Subtract the tare weight. This is the
sample net weight (NetWeight).
Return the sample material to the hopper.
9.
Multiply the net weight by 100. The result is the
TestRate, kilograms or pounds of fertilizer delivered
per hectare or acre.
10. Calculate an error factor for the TestRate vs. your
desired FieldRate.
If the ErrorFactor is in the range 0.97 to 1.03, the
system is operating at your desired field rate.
Continue at step 13, otherwise continue at step 11.
Note: Rate adjustment increments may be as high as
12% from one sprocket paring to the next. It may
not be possible to set a precise rate.
11. Generate a (New)ChartRate by applying the
ErrorFactor to the (Old)ChartRate (the chart rate just
used for the most recent trial, not to the FieldRate).
12. Adjust the auger as required. Install the
Transmission sprockets for the new chart rate, and
repeat step 7 through step 10.
Note: If the auger setting is changed, be sure to run
another sample test.
13. Reconnect the delivery hoses to the hopper outlets.
Re-install any seed meter drive system chains
removed.
Example Calibration:
Planter model: YP825AR-0875, Ground Drive
continuing the Example on page 50.
Application Rate Risk:
Make field checks to assure you are applying fertilizer at the
desired rate. Fertilizer application rates can vary from the
weights in the charts.
FieldRate: 112
ChartRate: 121
Outlets to sample:
2
Two empty sample containers, each weighing:
50 grams
TareWeight = 2
× 50 = 100 grams (0.10 kg)
Distance to sample (from chart above)
66.67 meters
Total weight of samples, in containers:
1.14 kg (GrossWeight)
Net weight of sample:
1.14 - 0.10 = 1.04 kg (NetWeight)
Effective rate for 1 hectare:
1.04
× 100 = 104 kg/ha (TestRate)
Error factor:
112
÷ 104 = 1.07
Next chart rate to try:
1.07
× 121 = 130 (New)ChartRate
Per the chart on page 110, the closest ChartRate is:
130 kg/ha
which corresponds to settings:
High Rate range
DRIVING: 23T
DRIVEN: 44T
NetWeight
GrossWeight
TareWeight
–
=
TestRate
NetWeight
100
×
=
ErrorFactor
FieldRate
TestRate
---------------------
=
(New)ChartRate
ErrorFactor
(Old)ChartRate
Ч
=