Great Plains 1300 13-Foot Material Rate User Manual
Page 18
16
1300 and 1300F
Great Plains Manufacturing, Inc.
175-157B
2014-03-10
38. If not already done, set the Seed Rate Handle. If
fertilizer is loaded, remove the fertilizer drive chain
(unless you are simultaneously calibrating fertilizer
rate).
39. Load seed above the rows to be sampled. Load well
more than the expected sample size.
40. Rotate the crank several turns counter-clockwise to
ensure that the drives and seed cups are engaged,
working properly, free from foreign material, and that
seed is flowing steadily from the meters. Stop.
41. Note the current reading of the acremeter, unless
you do not plan to rely on it for the calibration.
42. Empty the sample containers back into the seed box.
43. Record the weight of the empty containers and place
them back under the three hoses to gather metered
seed.
44. Turn crank at approximately 23 rpm until one acre is
tallied on acremeter. While turning, check that cups
have ample seed coming into them.
45. Weigh metered seed. Subtract initial weight of
container(s)
46. Divide the net seed weight by three. Multiply by
number of openers on your drill to determine the
total of pounds-per-acre seeded.
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:
using a row spacing of:
7.5 inches
row count:
21
you desire to plant alfalfa at:
10 pounds per acre.
This corresponds to an initial Seed Rate Handle of:
50
For example:
three 0.5 pound (8 oz) containers weigh:
1.5 lbs
Rotations for 1 acre:
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 2.6 lbs after test:
1.1 lbs net
NetWeight
GrossWeight
ContainerWeights
–
=
1.1
2.6
1.5
–
=
For example:
a 7.5in drill has 21 rows:
7.7 lbs/ac
MeasuredRate
NetWeight
3
-------------------------
RowCount
Ч
=
7.7
1.1
3
-------
21
Ч
=