Great Plains 3P806NT Material Rate - Manual (Page 26)

151-143B Table of Contents Main Box Rates 2011-10-21
24 3P806NT Table of Contents Main Box Rates Great Plains Manufacturing, Inc.
Small Seeds Rate
Seeding rate from the optional Small Seeds Attachment
is controlled entirely by the seed rate handle on the small
seeds box. No sprocket changes are required, and small
seeds rate is unaffected by settings for the main seed
box or other optional boxes.
Refer to Figure 12
To set Small Seeds rate, loosen the wing nut
at the
handle. Move the lever until the indicator is about 10
higher than the intended setting, then return it to that
setting. Tighten nut.
Set the initial rate based on the charts on page 27 and
page 28.
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.
Due to the large number of crank revolutions per acre
(310 or 569) and per hectare (766 or 1405), a practical
calibration is a simulation of
1 ⁄
10
th
acre or
1 ⁄
10
th
hectare.
1. Estimate the sample sizes.
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.
3. Raise the drill so the gauge wheel is out of ground
contact. If the gauge wheel is in ground contact,
cranking is difficult or impossible.
4. Remove the calibration crank from its storage stob.
Store the retaining pin on the stob.
5. Rotate the crank or tire several turns 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.
6. 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 12
Small Seeds Rate Handle
32634
1
2
1
2
Example: You want to apply alfalfa at 12 pounds per
acre. RateSample is:
Example: SamplePerRow is
0.09 pounds:
Example: 3 rows are to be used in the sampling.
ExpectedSample is:
0.28 pounds
1.2
12
10
------
=
0.092
1.2
13
------- =
0.277 0.092 3 × =
RateSample
TargetRate
10
----------------------------- =
SamplePerRow
RateSample
RowCount
------------------------------------
=
ExpectedSample SamplePerRow SampledRows
×
=
Example: 3 containers each weighing 0.20 lb or:
0.60 lb total
Crushing Hazard:
Install lift cylinder lock(s) on a raised drill.