Great Plains 1300 13-Foot Material Rate User Manual
Page 25
Great Plains Manufacturing, Inc.
Fertilizer Rate
23
2014-03-10
175-157B
81. Pull the fertilizer hoses off the top of three openers,
at the top of the openers. Place the hoses into each
sample container.
82. If not already done, make any density correction,
then using the chart for the target rate, set the Range
and Transmission sprockets. If seed is loaded,
remove the drive chain for the seed box (unless you
are simultaneously calibrating seed rate).
83. Load fertilizer above the rows to be sampled. Load
well more than the expected sample size.
Follow material supplier recommendations for safety
precautions in handling fertilizer.
84. Rotate the crank several turns counter-clockwise to
ensure that the drive and meters are engaged,
working properly, free from foreign material, and that
material is flowing steadily from the meters. Stop.
85. Note the current reading of the acremeter, unless
you do not plan to rely on it for the calibration.
86. Empty the sample containers back into the fertilizer
box.
87. Record the weight of the empty containers and place
them back under the three hoses to gather metered
material.
88. Turn crank at approximately 23 rpm until one acre is
tallied on acremeter. While turning, check that cups
have ample seed coming into them.
89. Weigh metered material. Subtract initial weight of
container(s)
90. Divide the net material weight by three. Multiply by
number of openers on your drill to determine the
total of pounds-per-acre applied.
Row Spacing
Rotations Per Acre (Ha)
6 inch (15.2 cm)
134 (331) rotations
7.5 inch (19.1 cm)
133 (329) rotations
10 inch (25.4 cm)
131 (324) rotations
For example, on a 1300F-2175 drill:
you desire to apply 45 lb/cu-ft material at a rate of:
100 pounds per acre
The density correction factor is 1.45.
145 = 100 x 1.45
Use initial sprocket setting for a 145 pounds/ac rate:
Range: High
Driver: 17T
Driven: 19T
For example:
three empty 1.8 pound containers weigh:
5.4 lbs
Rotations for 1 acre is:
133
23 rpm (2.6 sec/rev) simulates a 6.5 mph (10.4 kph) field
speed.
For example:
the three containers weighed a total of 19.1 pounds after
test: 13.7 lbs net
NetWeight
GrossWeight
ContainerWeights
–
=
13.7
19.1
5.4
–
=
For example:
a 21-row (7.5in) drill: 95.9 lbs/ac
MeasuredRate
NetWeight
3
-------------------------
RowCount
Ч
=
95.9
13.7
3
---------
21
Ч
=