Great Plains 1007NT Material Rate - Manual (Page 8)

Great Plains Mfg., Inc.
6
150-290B 07/08/2009
Main Box Seed Rate Calibration
Differences will exist between the tested seed and field
conditions used to generate the Seed Rate Charts, and
your seed and conditions. To accurately achieve your tar-
get population, Great Plains recommends calibrating.
Perform the calibration with the drill raised. Leave the
tractor hitched for movement control.
1. Estimate the sample size. If sampling for 1/10th acre
or 1/10th hectare, first divide the area rate by 10.
Divide the sample rate by the row count of your drill,
and multiply by the number of rows sampled.
2. 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.
Refer to Figure 1 on page 2
3.
Transfer the calibration crank handle from its storage
position to the ground drive wheel (see page 2).
4. Pull the seed hoses off the top of three opener seed
tubes, at the top of the openers. Place the hoses into
each sample container.
5. If not already done, set the Drive Type, Seed Rate
Seed rate: Handle and Seed Cup Doors across the
drill. If fertilizer is loaded, remove the fertilizer drive
chain (unless you are simultaneously calibrating fer-
tilizer rate).
6. Load seed above the rows to be sampled. Load well
more than the expected sample size.
7. 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.
8. Note the current reading of the acremeter, unless
you do not plan to rely on it for the calibration.
9. Empty the sample containers back into the seed box.
10. Record the weight of the empty containers and place
them back under the three hoses to gather metered
seed.
For example:
The target is Barley at 60 pounds per acre.
Sampling for 1/10th acre is:
6 lbs = 60 ÷ 10
The expected sample weight is 0.4 lbs:
0.4 lbs = ( 6 ÷ 10 ) x 15
SampleRate
TargetRate
10
-------------------------- =
ExpectedSample
Sample Rate
3
---------------------------- OpenerCount
×
=
For example:
on a drill with a row spacing of:
7.5in
and row count of:
15
you desire to plant barley at:
60 pounds per acre
which, from the chart, is an initial Seed Rate Handle
scale setting of:
45
Drive Type:
2
and Seed Cup Door handle:
1
For example:
three empty 0.5 pound (8 oz.) containers weigh:
1.5 lbs