Small seeds rate, Small seeds rate calibration – Great Plains 1300 13-Foot Material Rate User Manual
Page 17
2014-03-10
175-157B
Great Plains Manufacturing, Inc.
15
Small Seeds Rate
Seeding rate from the optional Small Seeds Attachment
is controlled entirely by a seed rate handle on the small
seeds box. No sprocket changes are required, and small
seeds rate is unaffected by settings for main seed box.
To set Small Seeds rate, loosen the wing nut
at the
handle, and adjust the lever
position. Tighten nut.
Set the initial rate based on the chart in the Seed Rate
Manual.
Small Seeds Rate Calibration
Differences will exist between the tested seed, and field
conditions used to generate the Small Seeds Rate
Charts, and your seed and conditions. To accurately
achieve your target population, Great Plains
recommends calibrating.
Perform the calibration with opener frames lowered (if
the openers are raised, the clutch disengages). Leave
the tractor hitched for movement control.
32. Estimate the sample sizes.
Take your planned population (in our example,
alfalfa at 10 pounds per acre
and divide it by the row count of the drill:
21 in our example.
The expected sample size is 0.48 lbs per row, or
1.43 pounds for 3 sample rows.
33. To perform this calibration, you need a scale that is
accurate near the aggregate sample size, and three
(3) light-weight containers, each capable of holding a
row’s sample.
34. Disengage the lock-out hub (see Operator Manual),
to permit independent rotation of the main jackshaft.
Refer to Figure 9
35. Remove the calibration crank from its storage stob
on the left top side of the main toolbar. Store the
retaining pin on the stob.
Refer to Figure 10
36. Place the hex socket of the crank on the left end of
the main jackshaft.
37. Pull the small seed hoses off the top of three opener
seed tubes, at the top of the openers. Place the
hoses into each sample container.
Figure 8
Small Seeds Rate Handle
18511
1
2
1
2
Figure 9
Calibration Crank Stored
16651
Figure 10
Calibration Crank Engaged
16652